Quantum Physics

Inclusive production of -hyperons was measured with the large acceptance NA61/SHINE spectrometer at the CERN SPS in inelastic p+p interactions at beam momentum of 158 GeV/c. Spectra of transverse momentum and transverse mass as well as distributions of rapidity and x F are presented. The mean multiplicity was estimated to be 0.120 ± 0.006 (stat.) ±0.010 (sys.). The results are compared with previous measurements and predictions of the Epos, Urqmd and Fritiof models.

In this paper, we establish a Marcinkiewicz type interpolation theorem for convex functions of maximal functions in the noncommutative setting. As applications, we prove the noncommutative analogue of the Doob inequality for convex functions of maximal functions on martingales, the analogue of the classical Dunford-Schwartz maximal ergodic inequality for convex functions of positive contractions, and that of Stein's maximal inequality for convex functions of symmetric positive contractions. As a consequence, we obtain the moment Burkholder-Davis-Gundy inequality for noncommutative martingales.

An interesting link between two very different physical aspects of quantum mechanics is revealed; these are the absence of third-order interference and Tsirelson's bound for the nonlocal correlations. Considering multiple-slit experiments - not only the traditional configuration with two slits, but also configurations with three and more slits - Sorkin detected that third-order (and higher-order) interference is not possible in quantum mechanics. The EPR experiments show that quantum mechanics involves nonlocal correlations which are demonstrated in a violation of the Bell or CHSH inequality, but are still limited by a bound discovered by Tsirelson. It now turns out that Tsirelson's bound holds in almost any other probabilistic theory provided that a reasonable calculus of conditional probability is included and third-order interference is ruled out.

Typical materials used in thermoluminescence (TL) dosimetry exhibit the following common characteristics: (i) the temperature of glow peak maximum of individual glow peaks remains practically constant over a wide dose range, (ii) there are no systematic changes in the glow curve shapes with the irradiation dose, and (iii) higher order kinetics is rarely seen in dosimetric materials, while first‐order kinetics is a common occurrence in experimental TL work. Theoretical explanation of these experimental characteristics is an open topic of TL research. In the present work these three characteristics are studied by using several models of increasing complexity. The simplest model studied is based on the empirical analytical general order (GO) expressions, followed by two commonly used models, the well‐known one trap one recombination center models (OTOR) and the interactive multiple trap system (IMTS). Previous researchers have studied the behavior of these models using arbitrary values...

Attempts to treat time on an equivalent footing with space in quantum mechanics have been apparently dominated by 'timeless' approaches, such as the one of Page and Wootters, which allow meaningful discussion of a 'time operator'. However, there is an alternative, and significantly less studied approach, due to Bauer, which makes use of the 'pseudospin' extension of the state space, effectively adding a backwards-time degree of freedom. This two-time approach allows definition of a 'time operator' and moreover bears interesting relations with other time-symmetric formulations of quantum mechanics. We review and compare these approaches to quantum time, emphasizing that there is a subtle choice between the timeless framework and the two-time approach. Finally, we sketch a framework in which the timeless philosophy can be combined with two-time quantum mechanics.

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The inclusive jet cross section for proton-proton collisions at a centre-of-mass energy of 7[Formula: see text] was measured by the CMS Collaboration at the LHC with data corresponding to an integrated luminosity of 5.0[Formula: see text]. The measurement covers a phase space up to 2[Formula: see text] in jet transverse momentum and 2.5 in absolute jet rapidity. The statistical precision of these data leads to stringent constraints on the parton distribution functions of the proton. The data provide important input for the gluon density at high fractions of the proton momentum and for the strong coupling constant at large energy scales. Using predictions from perturbative quantum chromodynamics at next-to-leading order, complemented with electroweak corrections, the constraining power of these data is investigated and the strong coupling constant at the Z boson mass [Formula: see text] is determined to be [Formula: see text], which is in agreement with the world average.

Results are presented from a search for particle dark matter (DM), extra dimensions, and unparticles using events containing a jet and an imbalance in transverse momentum. The data were collected by the CMS detector in proton-proton collisions at the LHC and correspond to an integrated luminosity of 19.7[Formula: see text]at a centre-of-mass energy of 8[Formula: see text]. The number of observed events is found to be consistent with the standard model prediction. Limits are placed on the DM-nucleon scattering cross section as a function of the DM particle mass for spin-dependent and spin-independent interactions. Limits are also placed on the scale parameter [Formula: see text] in the Arkani-Hamed, Dimopoulos, and Dvali (ADD) model of large extra dimensions, and on the unparticle model parameter [Formula: see text]. The constraints on ADD models and unparticles are the most stringent limits in this channel and those on the DM-nucleon scattering cross section are an improvement over ...

A search motivated by supersymmetric models with light top squarks is presented using proton-proton collision data recorded with the CMS detector at a center-of-mass energy of ffiffi ffi s p ¼ 7 TeV during 2011, corresponding to an integrated luminosity of 4:98 fb À1 . The analysis is based on final states with a single lepton, b-quark jets, and missing transverse energy. Standard model yields are predicted from data using two different approaches. The observed event numbers are found to be compatible with these predictions. Results are interpreted in the context of the constrained minimal supersymmetric standard model and of a simplified model with four top quarks in the final state.

Results are presented of a search for the production of new particles decaying to pairs of partons (quarks, antiquarks, or gluons), in the dijet mass spectrum in proton-proton collisions at ffiffi ffi s p ¼ 8 TeV. The data sample corresponds to an integrated luminosity of 4:0 fb À1 , collected with the CMS detector at the LHC in 2012. No significant evidence for narrow resonance production is observed. Upper limits are set at the 95% confidence level on the production cross section of hypothetical new particles decaying to quarkquark, quark-gluon, or gluon-gluon final states. These limits are then translated into lower limits on the masses of new resonances in specific scenarios of physics beyond the standard model. The limits reach up to 4.8 TeV, depending on the model, and extend previous exclusions from similar searches performed at lower collision energies. For the first time mass limits are set for the Randall-Sundrum graviton model in the dijet channel.

We report a search for CP violation in the decay modes s → K 0 S π ± using a data set corresponding to an integrated luminosity of 469 fb -1 collected with the BABAR detector at the PEP-II asymmetric energy e + e -storage rings. The decay rate CP asymmetries, ACP , are determined to be (+0.13 ± 0.36(stat) ± 0.25(syst))%, (-0.05 ± 0.23(stat) ± 0.24(syst))%, and (+0.6 ± 2.0(stat) ± 0.3(syst))%, respectively. These measurements are consistent with zero, and also with the standard model prediction ((-0.332 ± 0.006)% for the D ± → K 0 S K ± and D ± s → K 0 S K ± modes, and (+0.332 ± 0.006)% for the D ± s → K 0 S π ± mode). They are the most precise determinations to date.

A measurement of the underlying event (UE) activity in proton-proton collisions at a center-of-mass energy of 7 TeV is performed using Drell-Yan events in a data sample corresponding to an integrated luminosity of 2.2 fb -1 , collected by the CMS experiment at the LHC. The activity measured in the muonic final state (qq → μ + μ -) is corrected to the particle level and compared with the predictions of various Monte Carlo generators and hadronization models. The dependence of the UE activity on the dimuon invariant mass is well described by PYTHIA and HERWIG++ tunes derived from the leading jet/track approach, illustrating the universality of the UE activity. The UE activity is observed to be independent of the dimuon invariant mass in the region above 40 GeV/c 2 , while a slow increase is observed with increasing transverse momentum of the dimuon system. The dependence of the UE activity on the transverse momentum of the dimuon system is accurately described by MADGRAPH, which simulates multiple hard emissions.

An inclusive search for supersymmetric processes that produce final states with jets and missing transverse energy is performed in pp collisions at a centre-ofmass energy of 8 TeV. The data sample corresponds to an integrated luminosity of 11.7 fb -1 collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, α T , is used to discriminate between events with genuine and misreconstructed missing transverse energy. The search is based on an examination of the number of reconstructed jets per event, the scalar sum of transverse energies of these jets, and the number of these jets identified as originating from bottom quarks. No significant excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of simplified models, with a special emphasis on both compressedspectrum scenarios and direct or gluino-induced production of third-generation squarks. For the case of gluino-mediated squark production, gluino masses up to 950-1125 GeV are excluded depending on the assumed model. For the direct pair-production of squarks, masses up to 450 GeV are excluded for a single light first-or second-generation squark, increasing to 600 GeV for bottom squarks.

A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for tt events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb -1 collected by the CMS experiment in pp collisions at √ s = 7 TeV. The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of M t = 173.9 ± 0.9 (stat.) +1.7 -2.1 (syst.) GeV is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.

Results are reported from a search for new physics processes in events containing a single isolated high-transverse-momentum lepton (electron or muon), energetic jets, and large missing transverse momentum. The analysis is based on a 4.98 fb -1 sample of proton-proton collisions at a center-of-mass energy of 7 TeV, obtained with the CMS detector at the LHC. Three separate background estimation methods, each relying primarily on control samples in the data, are applied to a range of signal regions, providing complementary approaches for estimating the background yields. The observed yields are consistent with the predicted standard model backgrounds. The results are interpreted in terms of limits on the parameter space for the constrained minimal supersymmetric extension of the standard model, as well as on cross sections for simplified models, which provide a generic description of the production and decay of new particles in specific, topology based final states.

It has been postulated that partonic orbital angular momentum can lead to a significant doublehelicity dependence in the net transverse momentum of Drell-Yan dileptons produced in longitudinally polarized p +p collisions. Analogous effects are also expected for dijet production. If confirmed by experiment, this hypothesis, which is based on semi-classical arguments, could lead to a new approach for studying the contributions of orbital angular momentum to the proton spin. We report the first measurement of the double-helicity dependence of the dijet transverse momentum in longitudinally polarized p + p collisions at √ s = 200 GeV from data taken by the PHENIX experiment in 2005 and 2006. The analysis deduces the transverse momentum of the dijet from the widths of the near-and far-side peaks in the azimuthal correlation of the dihadrons. When averaged over the transverse momentum of the triggered particle, the difference of the root-mean-square of the dijet transverse momentum between like-and unlike-helicity collisions is found to be -37 ± 88 stat ± 14 syst MeV/c.

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the invariant differential cross section for production of K 0 S , ω, η ′ , and φ mesons in p + p collisions at √ s = 200 GeV. Measurements of ω and φ production in different decay channels give consistent results. New results for the ω are in agreement with previously published data and extend the measured pT coverage. The spectral shapes of all hadron transverse momentum distributions measured by PHENIX are well described by a Tsallis distribution functional form with only two parameters, n and T , determining the high-pT and characterizing the low-pT regions of the spectra, respectively. The values of these parameters are very similar for all analyzed meson spectra, but with a lower parameter T extracted for protons. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.

We present a measurement of the cross section and transverse single-spin asymmetry (AN ) for η mesons at large pseudorapidity from √ s = 200 GeV p ↑ + p collisions. The measured cross section for 0.5 < pT < 5.0 GeV/c and 3.0 < |η| < 3.8 is well described by a next-to-leading-order perturbative-quantum-chromodynamics calculation. The asymmetries AN have been measured as a function of Feynman-x (xF ) from 0.2 < |xF | < 0.7, as well as transverse momentum (pT ) from 1.0 < pT < 4.5 GeV/c. The asymmetry averaged over positive xF is AN = 0.061±0.014. The results are consistent with prior transverse single-spin measurements of forward η and π 0 mesons at various energies in overlapping xF ranges. Comparison of different particle species can help to determine the origin of the large observed asymmetries in p ↑ + p collisions.

Correlations of charged hadrons of 1 < pT < 10 Gev/c with high pT direct photons and π 0 mesons in the range 5 < pT < 15 Gev/c are used to study jet fragmentation in the γ+jet and dijet channels, respectively. The magnitude of the partonic transverse momentum, kT , is obtained by comparing to a model incorporating a Gaussian kT smearing. The sensitivity of the associated charged hadron spectra to the underlying fragmentation function is tested and the data are compared to calculations using recent global fit results. The shape of the direct photon-associated hadron spectrum as well as its charge asymmetry are found to be consistent with a sample dominated by quark-gluon Compton scattering. No significant evidence of fragmentation photon correlated production is observed within experimental uncertainties.

Unpolarized cross sections and double-helicity asymmetries of single-inclusive positive and negative charged hadrons at midrapidity from p+p collisions at √ s = 62.4 GeV are presented. The PHENIX measurement of the cross sections for 1.0 < pT < 4.5 GeV/c are consistent with perturbative QCD calculations at next-to-leading order in the strong-coupling constant, αs. Resummed pQCD calculations including terms with next-to-leading-log accuracy, yielding reduced theoretical uncertainties, also agree with the data. The double-helicity asymmetry, sensitive at leading order to the gluon polarization in a momentum-fraction range of 0.05 < ∼ x gluon < ∼ 0.2, is consistent with recent global parameterizations disfavoring large gluon polarization.

We report on the first measurement of the double-spin asymmetry, ALL, of electrons from the decays of hadrons containing heavy flavor in longitudinally polarized p+p collisions at √ s = 200 GeV for pT = 0.5 to 3.0 GeV/c. The asymmetry was measured at midrapidity (|η| < 0.35) with the PHENIX detector at the Relativistic Heavy Ion Collider. The measured asymmetries are consistent with zero within the statistical errors. We obtained a constraint for the polarized gluon distribution in the proton of |∆g/g(log 10 x = -1.6 +0.5 -0.4 , µ = m c T )| 2 < 0.033 (1σ) based on a leading-order perturbative-quantum-chromodynamics model, using the measured asymmetry.

Thermal models have been used to successfully describe the hadron yields from heavy ion collisions at a variety of energies. For root(S)&lt;17 GeV this has usually been done using yields integrated over 4pi but at the higher energies available at RHIC, yields measured at central rapidity have been used. Recent BRAHMS data allows us to test whether thermal models can be generalized to describe the rapidity dependence of particle ratios. We have used the THERMUS package to fit BRAHMS data for the 5% most central Au+Au collisions for several rapidities at root(S) = 62 and 200 GeV. We have found a relationship between the strange and light quark chemical potentials, muS = 0.21 +-0.01muB. Using this relation we are able to describe the energy dependence of Lambda, Xsi and Omega ratios from other experiments. We also find that the chemical potentials are consistent with limiting fragmentation.

The prompt D 0 meson azimuthal anisotropy coefficients, v 2 and v 3 , are measured at midrapidity (|y| < 1.0) in PbPb collisions at a center-of-mass energy √ s NN = 5.02 TeV per nucleon pair with data collected by the CMS experiment. The measurement is performed in the transverse momentum (p T ) range of 1 to 40 GeV/c, for central and midcentral collisions. The v 2 coefficient is found to be positive throughout the p T range studied. The first measurement of the prompt D 0 meson v 3 coefficient is performed, and values up to 0.07 are observed for p T around 4 GeV/c. Compared to measurements of charged particles, a similar p T dependence, but smaller magnitude for p T < 6 GeV/c, is found for prompt D 0 meson v 2 and v 3 coefficients. The results are consistent with the presence of collective motion of charm quarks at low p T and a path length dependence of charm quark energy loss at high p T , thereby providing new constraints on the theoretical description of the interactions between charm quarks and the quark-gluon plasma.

The Çð1SÞ, Çð2SÞ, and Çð3SÞ production cross sections in proton-proton collisions at ffiffi ffi s p ¼ 7 TeV are measured using a data sample collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 3:1 AE 0:3 pb À1 . Integrated over the rapidity range jyj < 2, we find the product of the Çð1SÞ production cross section and branching fraction to dimuons to be ðpp ! Çð1SÞXÞ Á BðÇð1SÞ ! þ À Þ ¼ 7:37 AE 0:13 þ0:61 À0:42 AE 0:81 nb, where the first uncertainty is statistical, the second is systematic, and the third is associated with the estimation of the integrated luminosity of the data sample. This cross section is obtained assuming unpolarized Çð1SÞ production. With the assumption of fully transverse or fully longitudinal production polarization, the measured cross section changes by about 20%. We also report the measurement of the Çð1SÞ, Çð2SÞ, and Çð3SÞ differential cross sections as a function of transverse momentum and rapidity.

Performance tests of some aspects of the CMS ECAL were carried out on modules of the "barrel" subsystem in 2002 and 2003. A brief test with high energy electron beams was made in late 2003 to validate prototypes of the new Very Front End electronics. The final versions of the monitoring and cooling systems, and of the high and low voltage regulation were used in these tests. The results are consistent with the performance targets including those for noise and overall energy resolution, required to fulfil the physics programme of CMS at the LHC.

Results are reported from a search for new physics processes in events containing a single isolated high-transverse-momentum lepton (electron or muon), energetic jets, and large missing transverse momentum. The analysis is based on a 4.98 fb -1 sample of proton-proton collisions at a center-of-mass energy of 7 TeV, obtained with the CMS detector at the LHC. Three separate background estimation methods, each relying primarily on control samples in the data, are applied to a range of signal regions, providing complementary approaches for estimating the background yields. The observed yields are consistent with the predicted standard model backgrounds. The results are interpreted in terms of limits on the parameter space for the constrained minimal supersymmetric extension of the standard model, as well as on cross sections for simplified models, which provide a generic description of the production and decay of new particles in specific, topology based final states.

An Ag(111) single crystal electrode emersed from NaF+NaOH electrolyte (pH 11) under anodic polarisation has been studied ex situ by means of X-ray photoelectron spectroscopy ( XPS). ''Underpotential'' oxidation has been found at +0.2 and 0.0 V vs. Hg/HgO, that is by 0.2-0.4 V more negative than the reversible potential of the Ag 2 O phase formation. The generation of a number of surface and bulk oxygen-containing species, including surface Ag 2 O-like species, surface and bulk OH groups (OH ads and OH bulk , respectively), surface and bulk atomic oxygen, has been observed on the emersed electrode. The present work provides the first direct evidence of the hydroxide incorporation in the bulk of an Ag(111) electrode in the course of underpotential oxidation. OH bulk is characterised by a O 1s peak at approximately 532.8 eV, while surface OH ads manifests itself as the peak at ca. 531.6 eV. The origin of the positive binding energy shift is discussed. Surface and bulk OH groups demonstrate substantially different thermal stability. Surface species desorb below 470 K, while dissolved OH groups exhibit high stability towards prolonged annealing in vacuum at temperatures up to 750 K; they remain in the near-surface region even after sputtering by Ar+ and He+ ions. The oxide-like species is characterised by the O 1s peak at 529.5 eV and decomposes after heating in vacuum at a temperature of about 470 K. The He(I ) and He(II ) UP spectra of the emersed electrode along with the XPS data provide evidence that the coverage with surface oxide is less than 1 ML. A tentative scheme of Ag(111) underpotential oxidation is discussed.

Step stiffness and surface diffusion on Au(111) studied by LEEM MICHAL ONDREJCEK, WACLAW SWIECH, MAHESH RAJAPPAN, C. PETER FLYNN, University of Illinois at Urbana-Champaigh -Using LEEM we have examined the equilibrium step structure of Au(111) surface. The study is part of ongoing project of using step fluctuation spectroscopy on different fcc(111) and bcc(011) surfaces. From capillary wave analyses we obtained fluctuation amplitudes and relaxation times for Fourier components of the step edge displacement as functions of wave number q and temperature. Similar to Pt(111) and Pd(111) [1] the relaxation rates at ∼0.65 T m vary accurately with wavevector q as q 3 , showing that relaxation is driven by surface diffusion on the terraces. Bulk vacancy diffusion becomes the dominant relaxation mechanism at high temperatures, with τ -1 q ∼ q 2 . The results yield values for the surface and bulk mass diffusion coefficient, D s =1.7x10 -3 exp(-0.87eV/k B T) cm 2 /s; D b =0.06 exp(-1.95eV/k B T) cm 2 /s. The orientation-dependent but only weakly temperature dependent step stiffness β(θ) was measured through the temperature range 900-1300K. The quantitative results of D s are compared to the other closed packed surfaces at homologous temperatures relative to T m . Finally we discuss the behavior of double steps formed at higher temperatures, The stiffness is about 1.4 times that of a single step. This research is supported by DOE grants DEFG02-02ER46011 and DEFG02-91-ER45439. [1] M. Ondrejcek, W. Swiech and C.P. Flynn, Surf.Sci. 566-568, 160 (2004).

Langit tampak biasa-biru kusam yang diliputi debu, dengan awan yang tak lagi berarak bebas sebagaimana dulu. Namun ruh Kael bergetar, seakan ada sesuatu yang hendak menyampaikan pesan dari kedalaman bumi. Sudah tiga malam berturut-turut ia tidak bisa tidur. Bukan karena rasa takut, melainkan karena ada suara samar yang menembus batinnya. Suara itu bukan kata-kata, bukan pula bisikan seperti manusia berbicara, tetapi semacam frekuensi-getaran yang langsung merambat ke dadanya. "Ingatlah janjimu… sebelum engkau ditiupkan ke rahim dunia." Kael menggigil. Kata-kata itu bukan berasal dari luar dirinya, melainkan muncul dari kedalaman kesadarannya sendiri. Ia berdiri di tengah lembah yang tak bertuan: reruntuhan menara komunikasi yang dulu pernah dipenuhi cahaya listrik kini tinggal kerangka besi yang bengkok, berkarat, dan tertutup lumut. Padang terbuka di sekitarnya membentang luas, seolah bumi sedang menahan napas, menunggu sesuatu yang besar segera terjadi. Dalam keheningan itu, Kael duduk bersila di atas tanah. Ia memejamkan mata, menarik napas panjang, lalu membiarkan pikirannya hening. Pada saat itulah suara itu kembali datang, lebih jelas, lebih dalam: "Makhluk bukan hanya yang tampak di mata… Kami adalah saksi-saksi langit, yang dikurung di dalam bumi menunggu pembebasan ruhani." Kael membuka matanya, tetapi tidak ada seorang pun di sekitarnya. Hanya angin yang berhembus membawa debu kering. Suara itu terdengar lagi: "Fitnah besar sedang naik. Apa yang engkau sebut 'kemajuan' bukanlah cahaya, melainkan Dajjal yang mengenakan topeng digital dan robotik." Kael menunduk. Ia tahu, dunia modern yang pernah ia kenal bukanlah surga, melainkan penjara dengan dinding transparan. Ilusi tentang kebebasan, padahal manusia sudah kehilangan akarnya: dzikir dan pengenalan kepada Sang Pencipta. Sejenak Kael teringat pada firman Allah: "Alastu birabbikum? Qālū balā." (Bukankah Aku Tuhanmu? Mereka menjawab: Benar, kami bersaksi…) (QS. Al-A'raf: 172) Itulah titik awal seluruh ruh. Sebelum lahir ke dunia, sebelum mengenal nama, bangsa, bahkan tubuh, setiap jiwa pernah berdiri di hadapan Allah, bersaksi bahwa hanya Dia-lah Tuhan yang sejati. Kini Kael tahu, suara itu sedang memanggilnya kembali ke titik janji itu. Sebuah titik yang tidak bisa dicapai dengan berjalan kaki, tidak bisa ditemukan dengan peta dunia, tetapi hanya bisa ditembus dengan makrifatullah-kesadaran untuk mengenal Allah melalui ruh yang murni. Langkah Kael membawanya lebih jauh ke sebuah dataran sunyi. Tak ada kota, tak ada manusia, hanya hamparan tanah yang terasa hidup. Ia menunduk, menyentuh bumi dengan telapak tangannya, dan merasakan getaran halus yang seperti aliran darah. "Pada hari itu bumi menceritakan beritanya…" (QS. Az-Zalzalah: 4) Kael tertegun. Bumi bukanlah benda mati. Bumi adalah saksi. Setiap langkah manusia, setiap sujud, setiap dosa, setiap amal-semuanya direkam. Dan suatu hari, bumi sendiri akan bersaksi di hadapan Sang Pencipta. Kael akhirnya menyadari: makrifat bukanlah ilmu tinggi yang hanya dimiliki oleh para ulama atau orang-orang khusus. Makrifat adalah ruh yang kembali ingat pada janji aslinya. Malam itu, Kael duduk di antara reruntuhan menara komunikasi yang sunyi. Ia memandang ke arah langit yang penuh bintang, namun baginya bintang-bintang itu tidak lagi sekadar cahaya. Ia melihatnya sebagai tanda-tanda: bukti bahwa di balik segala kegelapan, ada cahaya yang tak pernah padam. "Jika fitnah Dajjal adalah ilusi terbesar akhir zaman," gumam Kael, "maka satu-satunya jalan selamat adalah cahaya yang datang dari dalam ruh. Bukan cahaya layar, bukan cahaya mesin, melainkan cahaya makrifatullah." Dengan kesadaran itu, Kael mulai melantunkan dzikir perlahan. Lidahnya bergerak, namun yang lebih dalam adalah hati yang bergetar menyebut nama Allah. Saat itulah ia merasakan bumi bergetar ringan, seolah merespons dzikirnya. Malam semakin dalam. Angin kering berhembus membawa aroma tanah yang retak. Di kejauhan, Kael melihat bayangan pegunungan yang hitam pekat, seolah menjadi dinding raksasa yang membatasi dunia. Ia berjalan perlahan, menyusuri jalan yang sudah lama ditinggalkan. Rumput liar tumbuh di celah aspal yang retak, tanda bahwa peradaban manusia sudah ditelan bumi. Kael merasakan kesepian yang menakutkan sekaligus menenangkan. Ia sendirian, namun tidak benar-benar sendiri. Ada suara-suara samar yang mengiringi langkahnya. Bukan suara manusia, melainkan gema ruh yang pernah ada sebelum tubuh diciptakan. "Kael… engkau dipanggil bukan untuk melihat, tapi untuk ingat. Ingat asalmu, ingat janjimu, ingat siapa Tuhanmu." Kael berhenti melangkah. Dadanya sesak. Ia menunduk, meraba tanah dengan jarinya, seakan ingin memastikan bumi benar-benar berbicara padanya. Dalam keheningan itu, tiba-tiba dadanya terasa panas. Bukan panas fisik, melainkan api kesadaran. Seperti ada sesuatu yang terbakar di dalam dirinya-lapisan ego, rasa takut, dan ilusi yang selama ini ia kumpulkan. Ia menutup mata, mencoba menenangkan diri. Namun semakin ia melawan, semakin kuat api itu berkobar. Sampai akhirnya ia pasrah, membiarkan api itu membakar habis semua lapisan batin yang palsu. Di tengah kobaran itu, ia mendengar kalimat yang menembus batinnya: "Fitnah terbesar bukan datang dari luar… tetapi dari dirimu sendiri, ketika engkau lupa bahwa engkau adalah cahaya dari Allah." Air mata Kael menetes. Ia sadar, selama ini ia sering mencari cahaya di luar: pada teknologi, pada ilmu, pada simbol-simbol modernitas. Padahal cahaya itu selalu ada di dalam dirinyatertutup oleh debu dosa dan kabut kelalaian. Langkah Kael membawanya ke sebuah padang luas, dataran yang seakan tidak berujung. Langit di atasnya terlihat rendah, seperti kubah yang menekan bumi. Di tempat itulah Kael merasa seluruh semesta sedang mengamatinya. Kalimat itu berputar di dalam kepalanya, menyatu dengan degup jantungnya. Ia mulai berjalan tanpa arah pasti, hanya mengikuti suara batin yang membimbingnya. Tiba-tiba, bumi bergetar halus. Tidak seperti gempa, melainkan getaran yang lembut, seolah bumi sedang bernapas. Kael berhenti, lalu berlutut. "Bumi ini hidup," gumamnya. "Ia menyimpan rahasia, ia menyimpan kesaksian…" Di kejauhan, Kael melihat sebuah pohon tua berdiri sendirian. Batangnya besar, kulitnya retak-retak, dan cabangnya menjulang seperti tangan yang berdoa ke langit. Ia berjalan mendekat, dan ketika sampai di bawah pohon itu, ia merasakan keheningan yang berbeda. Daun-daun pohon itu berdesir, meski angin tak bertiup. Dari batangnya, terdengar suara samar: "Kael… setiap ruh pernah bersaksi di hadapan-Nya. Dan bumi inilah yang menjadi saksi atas semua janji itu." Kael meletakkan telapak tangannya di batang pohon. Seketika ia melihat kilasan-kilasan masa lalu: manusia-manusia yang sujud, para nabi yang berdiri di tanah yang sama, suarasuara yang menggemakan "Qālu balā". Ia terhuyung, hampir jatuh. Tapi pohon itu seolah menahannya. Malam semakin larut. Kael menengadah ke langit. Bintang-bintang berkelip, namun satu bintang tampak berbeda: cahayanya lebih terang, lebih dekat, seakan sedang turun perlahan. Kael memejamkan mata, dan dalam batinnya ia mendengar: "Cahaya itu bukan bintang. Itu adalah ingatanmu sendiri yang sedang kembali." Tiba-tiba ia teringat ayat: "Dan bumi pun bersaksi… bahwa hanya ruh yang mengenal Tuhan yang akan selamat dari fitnah terakhir." Kael menangis tanpa suara. Ia tahu, perjalanan ini bukan sekadar perjalanan jasmani. Ini adalah perjalanan untuk mengingat. Perjalanan untuk menemukan kembali kunci makrifatullah yang telah lama terkunci di dalam ruhnya. Langkah Kael membawa dirinya semakin jauh dari padang sunyi. Dalam keremangan malam, ia melihat siluet bangunan yang setengah roboh. Kubahnya pecah, dindingnya retak, dan menaranya condong ke satu sisi, seolah hendak jatuh. Ia mendekat perlahan, dan saat cahaya bulan menyinari, ia sadar: itu adalah sebuah masjid tua. Kael menahan napas. Masjid itu dulunya pasti megah. Namun kini, lantainya dipenuhi debu, karpetnya hilang, mihrabnya retak. Meski begitu, ada sesuatu yang tidak hancur: suasana sakral yang masih melekat. Ia melangkah masuk. Setiap langkah kakinya menimbulkan gema di ruangan kosong itu. Membersihkan sumber dosa (lahir & batin). Tanda: kejujuran pada aib diri, bukan sibuk aib orang. Menjaga yang syubhat; memegang dunia di tangan, bukan di hati. Stabil pada nikmat-sulit; naik turun emosi tidak mengoyak prinsip. Ikhtiar penuh, pasrah hasil. Ridha mengubahkan "beban" jadi "amanah". Cinta & keakraban kepada Allah; dzikir menjadi "napas batin". Penyaksian maknawi-bukan melihat zat-bahwa segala sesuatu bi idznillah. Ini tidak spektakuler; justru melahirkan tawadhu' yang halus. Catatan: Jalan ini berulang; seorang salik bisa kembali ke awal untuk dipadatkan lagiseperti menempa pedang berkali-kali agar lentur namun tajam.  Tenang tapi tajam: damai secara batin, waspada secara akal.  Lugas & adil: tidak mudah terpancing sensasi; menimbang dengan nurani & nash.  Sedikit bicara, banyak hadir: tidak anti-dunia, tapi tidak diperbudak dunia.  Dzikirnya hidup: bukan hanya lafaz; ia menjadi "gelombang batin" yang memancar dalam akhlak.  Teguh di tengah arus: tidak gampang ikut-ikutan; karena kompasnya dalam bukan di luar. Narasi Jilid IX menekankan fitnah sistemik: kemajuan berwajah ilusi-"cahaya" buatan yang memukau indera namun memadamkan hati: glorifikasi layar, metaverse, transhumanisme, "mesias" digital, dan ide keabadian berbasis server KAEL VERIDIAN JILID IX . Sasarannya: memindahkan pusat eksistensi dari ruh ke data, dari dzikir ke sinyal. Makrifat adalah "firewall" batin: Di titik itu, tidak ada lagi Kael, tidak ada lagi perjalanan. Yang ada hanyalah Allah -Al-Haqq, Al-Nūr, Al-Baqī. ✨ 7. Penutup Agung Kisah Kael berakhir bukan dengan kematian, bukan dengan kemenangan perang, bukan dengan mahkota, tetapi dengan fana dalam cahaya.  Semua bab hanyalah jalan.  Semua tokoh hanyalah cermin.  Semua kisah hanyalah perantara. Akhir sejati adalah kembali. Kembali ke Sumber. Kembali ke Allah. 🌟 TAMAT 🌟 Kembali ke...

Traditional physics treats spacetime as the fundamental stage upon which matter and energy evolve. Yet within this stage, we consistently observe local negentropic pockets-galaxies, superconductors, biological life, and consciousness itself. These phenomena resist the entropic drift that spacetime's rules seem to prescribe. From a System|Ethics (S|E) standpoint, this suggests that spacetime is not fundamental but emergent, arising as a projection of deeper informational recursion. We propose a formal distinction: spacetime is finite because it is emergent, while recursive information processes are infinite because they are fundamental.

Two novel techniques for eliminating deterministic noise from a page-oriented memory are presented. The first technique equalizes the output response of ON pixels by adjustment of the exposure of each pixel during the recording of each data page. A test image transmitted through the system measures the spatial nonuniformities, and the appropriate inverse filter is imposed upon the data page and recorded in the storage material. On readout, the output signal values are then spatially uniform, perturbed only by random noise sources. Experimental results of using this predistortion technique in a pixel-matched holographic storage system are shown. Under conditions of high volumetric density, raw bit-error-rate (BER) improvements of 6 -8 orders of magnitude are obtained (from 10 24 to ,10 210 ). The second technique uses a phase shift during holographic storage to subtract from bright OFF pixels. Under conditions of low spatial light modulator contrast, BER improvements of 6 orders of magnitude (from 10 22 to 10 28 ) are demonstrated.

An improved postprocessing algorithm that can compensate for arbitrary misregistrations between a detector array and the coherent image of a pixelated two-dimensional data page is described. Previously [Opt. Lett. 26, 542 (2001)], an algorithm was reported in which both linear and quadratic interpixel cross-talk contributions are reallocated to the appropriate neighboring pixels. However, page misalignments close to 60.5 pixels could not be corrected to an acceptable bit-error rate because of propagation in the iterative procedure. An improved algorithm is reported in which an intentional magnification error is introduced optically and then corrected during postprocessing. Experimental results from a pixel-matched megapel volume holographic system are presented, showing that the dependence of bit-error rate on transverse detector alignment is entirely removed. This improved procedure can completely bypass constraints on page registration, optical distortion, and material shrinkage that currently hamper page-oriented holographic storage systems.

We describe a digital holographic storage system for the study of noise sources and the evaluation of modulation and error-correction codes. A precision zoom lens and Fourier transform optics provide pixel-to-pixel matching between any input spatial light modulator and output CCD array over magnif ications from 0.8 to 3. Holograms are angle multiplexed in LiNbO 3 :Fe by use of the 90 ± geometry, and reconstructions are detected with a 60-frame͞s CCD camera. Modulation codes developed on this platform permit image transmission down to signal levels of ϳ2000 photons per ON camera pixel, at raw bit-error rates (BER's) of better than 10 25 . Using an 8 -12-pixel modulation code, we have stored and retrieved 1200 holograms (each with 45,600 user bits) without error, for a raw BER of ,2 3 10 28 .

We show that the oxidation state of Fe in LiNbO 3 has two competing effects on the diffraction efficiency of multiple holograms in 90 ± -geometry holographic storage. For crystals with moderate absorption, the saturation space-charge field is larger after high-temperature reduction treatment. However, reduction also increases absorption, which reduces the overall diffraction efficiency. We develop a theoretical model that predicts achievable diffraction efficiency as a function of oxidation state, doping level, photovoltaic field, crystal length, and region of beam overlap. We compare this model with experimental results for achievable diffraction efficiency and erasure-time constant.

The present paper reports on a new structure for H 2 gas sensing based on thin porous silicon carbide (PSiC) films. The PSiC layer has been formed by electrochemical etching of SiC films previously deposited onto p-type silicon substrate by pulsed laser deposition (PLD) using 6H-SiC target. Currentvoltage (I-V) and current-time (I-t) characteristics have been measured. A thin platinum (Pt) film ( Å thickness) deposited onto PSiC layer has been used as a catalytic metal. The Schottky diode parameters such as ideality factor (n), barrier height (f Bp ) and series resistance (R S ) have been evaluated under different concentrations of H 2 gas. The experimental results show that upon exposure to H 2 gas the barrier height, the ideality factor and the series resistance change significantly. The different changes in the electrical parameters of the structure (increase and decrease as a function of the H 2 concentration) have been explained by the formation of two inversion layers. The first one forms as soon as the gas is in contact with the sensor and the second when the concentration reaches 90 ppm. Subsequently, the effect of gas concentration on the maximum sensitivity value of the sensor has been investigated. A high sensitivity (DI/I) value around 86% is found at about 1 V bias voltage. In addition, the response and recovery times were determined to be around 55 s and 160 s, respectively. Finally, the structure shows a reversible response for low gas concentration at room temperature.

In this paper we construct a family of steady symmetric vortex patches for the incompressible Euler equations in a disk. The result is obtained by studying a variational problem in which the kinetic energy of the fluid is maximized subject to some appropriate constraints for the vorticity. Moreover, we show that these vortex patches shrink to a given minimum point of the corresponding Kirchhoff-Routh function as the vorticity strength parameter goes to infinity.

In this paper, we study the Cauchy problem of the nonlinear Schrodinger equation with a nontrival potential $V(x)$. Especially, we consider the case where the initial data is close to k solitons with prescribed phase and location, and investigate the evolution of the Schrodinger system. We prove that over a large time interval, all k solitons will maintain the shape, and the solitons dynamics can be regarded as an approximation of k particles moving in $\mathbb{R}^N$ with their accelerations dominated by $\nabla V$, provided these solitons are not too close to each other.

The transition integral is calculated from an oscillatory state to another oscillatory phase state with a different equilibrium point. It is understood that the wave functions between harmonic oscillators form a complete system of orthogonal functions, however, it turns out that the transition integral between one energy level and another is different from zero. This is possible because the oscillators move around a point of balance in desface. Two methods are used, one analytical and the other algebraic, which due to its symmetrical shape allows us a much more intuitive view of the phenomenon. Graphical results are shown that prove that the electron phonon interaction process takes place with high probability together with the multiple mode exchanges between the absorption centers.Se calcula la integral de transición de un estado oscilatorio a otro estado de fase oscilatorio con diferente punto de equilibrio. Se entiende que las funciones de ondas entre osciladores armónicos forman...

In this paper we explore the decay η b → τ + τ -as a probe for a light pseudoscalar or a light axial vector state. We estimate the standard model branching ratio for this decay to be ∼ 4×10 -9 . We show that considerably larger branching ratios, up to the present experimental limit of ∼ 8%, is possible in models with a light pseudoscalar or a light axial vector state. As we do not include possible mixing effects between the light pseudoscalar and the η b , our results should be reliable when the pseudoscalar mass is away from the η b mass.

We evaluate the decay constants for the B and D mesons and the form factors for the semileptonic decays of the B meson to D and D * mesons in a Bethe-Salpeter model. From data we extract V cb = 0.039 ± 0.002 from B → D * lν and V cb = 0.037 ± 0.004 from B → Dlν decays. The form factors are then used to obtain non-leptonic decay partial widths for B → Dπ(K) and B → DD(D s ) in the factorization approximation.

Vibrational Theory (VT) models gravity as an emergent property of standing wave dynamics in the Dynamic Matter (DM) field, offering an alternative to the ΛCDM framework. In this work, we apply a modified gravitational potential, Φᵥ(r) =-GM(r)/r [1 + β sin(2πr/λ)], to derive orbital velocities of stars within galaxies. The resulting expression, v(r)² = GM/r [1 + β sin(2πr/λ) + β (2πr/λ) cos(2πr/λ)], reduces to Newtonian predictions for inner stellar orbits while producing flattened velocity curves for outer stars. Averaging over the vibrational correction terms yields the constant orbital speeds observed in galaxies, eliminating the need to invoke dark matter. This treatment extends VT's gravitational framework, already successful in modeling Solar System anomalies such as Mercury's orbit, to galactic scales. VT thus provides a unified explanation for redshift, orbital dynamics, and rotation curves through resonance in the DM field

Nel corso dei lavori del secondo Convegno ITP (Italian Teacher Programme) del CERN presso il Liceo Scientifico “Enrico Fermi” di Padova (22-23 febbraio 2025), in particolare durante le poster sessions e i gruppi tematici di discussione dedicati ad aspetti particolari della didattica della Fisica, dei suoi fondamenti e della sua storia nella scuola secondaria di secondo grado, è emersa una criticità condivisa dalla maggior parte dei partecipanti. La scansione dei “programmi” scolastici e l’organizzazione dell’insegnamento della fisica nei nostri licei e istituti tecnici comporta due limiti tra loro complementari, dovuti non solo a croniche carenze strutturali che investono le attività di laboratorio, ma anche a un resistenze culturali all’innovazione metodologica da parte di molti docenti della disciplina: da un lato infatti le esperienze laboratoriali tendono a ridursi a un momento di “conferma” sul piano pratico e operativo dei contenuti teorici precedentemente introdotti e affrontati a lezione, secondo modalità tipicamente “frontali” e “trasmissive”; dall’altro risulta molto complicato trattare in modo sufficientemente accessibile, ma al tempo stesso rigoroso e approfondito, argomenti di fisica contemporanea come la relatività ristretta o la meccanica quantistica, per di più al quinto anno e in orario curricolare, senza ricorrere ad ore aggiuntive extra-curricolari legate a progetti dedicati e/o ad ore di potenziamento. 
Eppure viviamo immersi in un mondo quotidianamente dominato dall’impiego di tecnologie quantistiche e relativistiche, a cominciare da quelle che caratterizzano qualsiasi nostro dispositivo elettronico e dalle correzioni che devono essere costantemente apportate perché i nostri sistemi GPS funzionino. Il loro impatto in ogni aspetto delle nostre vite è diventato così pervasivo che ormai la consapevolezza di tutto ciò, delle sue implicazioni tecno-scientifiche e delle sue ricadute socio-economiche, etico-politiche, persino antropologico-culturali, ha assunto i tratti di una competenza chiave complessa in ambito sia STEM che umanistico, oltre che di cittadinanza attiva.
La scuola secondaria di secondo grado italiana, specialmente negli indirizzi tecnici e liceali, con particolare riferimento al triennio dei licei scientifici, non può più permettersi di considerare argomenti come la relatività (almeno quella ristretta) e la meccanica quantistica, nei loro nuclei concettuali fondamentali, come un “complemento” per sommi capi (spesso superficiale e frettoloso) a un “programma” di fisica che potrebbe benissimo fermarsi all’elettromagnetismo classico e all’incompatibilità fra trasformazioni di Lorentz e principio di relatività galileiana, magari con l’alibi didattico di una loro intrinseca e insormontabile difficoltà, che li renderebbe poco adatti ad essere affrontati “sul serio” in un istituto di istruzione superiore, incluso un liceo scientifico.
Il risultato finale di questo atteggiamento è che i nostri studenti, giunti al termine del secondo ciclo di istruzione, se arrivano ad affrontare in classe la fisica del Novecento lo fanno in maniera troppo “divulgativa”, aneddotica, quasi a titolo di curiosità e di chiosa finale al loro percorso didattico in fisica, senza un’autentica comprensione dei nodi problematici, dei paradossi, ma anche delle potenzialità dischiuse dalla “Seconda Rivoluzione Scientifica” del XX secolo e delle loro possibili ricadute su ogni aspetto della knowledge society odierna.
Nel mio intervento vorrei portare un punto di vista opposto, corroborato da ricerche e sperimentazioni che si sono rivelate efficaci in ambito didattico e che sono state oggetto di discussione nei giorni del Convegno ITP CERN di Padova, a cui ho partecipato da uditore in quanto docente liceale di filosofia e storia con un background accademico in storia epistemologica, filosofia e fondamenti della fisica. Si possono insegnare la meccanica quantistica e la relatività ristretta (fatta salva l’eventualità di accennare ai concetti essenziali della relatività generale) in modo significativo già a partire dal quarto anno di liceo, specialmente allo scientifico? Si possono fornire allo scopo le basi matematiche strettamente indispensabili al loro apprendimento nello stesso periodo? Con quale taglio è preferibile affrontare questi argomenti? Uno rigorosamente fisico-matematico (ma che rischia di essere di livello universitario avanzato) oppure uno che integri anche un approccio storico-epistemologico alla loro genesi ed evoluzione? In ogni caso, quale ruolo deve essere attribuito ad eventuali esperienze di laboratorio? Si possono condurre “veri” esperiementi di fisica dei quanti o di relatività ristretta a scuola, che non siano puramente dimostrativi ma che coinvolgano in prima persona lo studente e ne metta alla prova le conoscenze, abilità e competenze STEM, oltre a quelle trasversali di cooperazione e comunicazione in gruppo?
La risposta che vorrei provare a fornire a queste domande, tutt’altro che banali, è affermativa.
Sì, “si può fare”, a patto però di rovesciare la prospettiva: partire da esperimenti a carattere immersivo, operativo e coinvolgente intorno a pochi ma indispensabili concetti chiave, disponendo già del formalismo matematico essenziale per comprenderli e padroneggiarli in modo sufficientemente consapevole (ma senza indulgere in tecnicismi non necessari), per poi da questi e dalla discussione dei loro risultati ampliare lo sguardo e risalire a una loro rielaborazione teorica, che tenga conto anche della loro dimensione storica, epistemologica ed euristica. Questo approccio, che richiede certamente di “anticipare” al quarto anno la trattazione dell’elettromagnetismo classico rispetto alla termodinamica e in diretta continuità con la meccanica newtoniana, così come di introdurre una serie di strumenti matematici abitualmente previsti per il quinto anno (limiti, derivate, integrali e studio di funzioni, oltre al calcolo delle matrici e alle trasformazioni nel piano cartesiano), avrebbe peraltro il vantaggio di convergere in un’ottica interdisciplinare nell’ultimo anno con i “programmi” di storia e di filosofia dedicati al Novecento.
Nel corso della mia presentazione illustrerò alcuni esempi di esperimenti cruciali nella storia della fisica come lo studio della radiazione di corpo nero e dell’effetto fotoelettrico, l’esperimento della doppia fenditura o l’esperimento di Michelson-Morley sull’esistenza dell’etere luminifero che, se opportunamente semplificati, realizzati a partire da componenti commerciali reperibili sul mercato  a costi relativamente contenuti e adattati a un contesto scolastico, permettono di attivare un percorso didattico circolare che procede dall’esperienza di laboratorio (in cui protagonisti-ricercatori sono gli stessi allievi, adeguatamente preparati e guidati dal docente) alla messa a fuoco e concettualizzazione dei nodi teorici fondamentali della meccanica quantistica e della relatività (speciale) attraverso una ricostruzione storico-epistemologica dello stesso esperimento e del dibattito scientifico che si è sviluppato intorno ad esso, per poi tornare ai risultati dell’esperienza e alle loro implicazioni, anche rispetto agli sviluppi attuali e alle loro applicazioni tecnologiche (come gli sviluppi odierni dell’interferometria ottica per la rilevazione delle onde gravitazionali).
Per quanto riguarda in particolare la didattica laboratoriale dei concetti essenziali della fisica dei quanti nella scuola secondaria di secondo grado, durante i lavori del Convegno ITP CERN 2025 a Padova è stata presentata la possibilità di riprodurre in versione semplificata e adattata alle esigenze didattiche (con strumentazioni già brevettate e commercializzate ad un costo tutto sommato accessibile per le scuole mediante fondi PNRR e PON-FSE) gli esperimenti di Aspect, Clauser e Zeilinger sulla violazione delle disuguaglianze di Bell e il carattere non-locale della meccanica quantistica (entanglement): una teoria intrinsecamente probabilistica e non completabile classicamente in senso locale ricorrendo a “variabili nascoste”, che apre, tra la molte altre, alla possibilità del quantum computing e della crittografia quantistica.
Proprio la versione didattica dell’apparato sperimentale in questione, discussa a Padova e già introdotta tra il 2024 e il 2025 al Liceo Martin Luther King di Genova (per la prima volta in un liceo italiano e nella città ospite del Congresso SISFA), permette non solo di far scoprire direttamente agli studenti “sul campo” (dopo un periodo di training dedicato) le proprietà caratteristiche degli stati sovrapposti, dell’entanglement e della decoerenza in meccanica quantistica da un punto di vista teorico e storico-epistemologico (dibattito Bohr-Einstein sull’interpretazione del formalismo quantomeccanico ed esperimento EPR), ma anche di fare collegamenti significativi con la nozione di q-bit e con la possibilità di utilizzare l’apparato di Aspect-Clauser-Zeilinger come generatore di numeri genuinamente casuali, dunque di chiavi crittografiche autenticamente sicure perché immuni dai pattern periodici o semi-periodici tipici dei generatori algoritmici digitali.

In Italian upper secondary schools, especially in techno-scientific courses, contemporary physics topics such as special relativity and quantum mechanics are often treated superficially as late-stage additions rather than integral components of the curriculum. This is mainly due to structural limitations but also to resistance to methodological innovation. Yet in today's world, permeated by relativistic and quantum technologies, awareness of their conceptual and historical foundation has turned into a key competence. This contribution proposes an alternative didactic model with a circular approach. Starting from hands-on experiments (adapted to school settings and focused on a few indispensable notions) students can actively engage in inquiry-based learning. From these experimental foundations, the physics curriculum can then expand toward rigorous but accessible theoretical conceptualizations, framed within their historical-epistemological contexts, in order to reconstruct the importance of such experiments. Specific examples (black-body radiation, the photoelectric effect, the double-slit experiment, and the Michelson-Morley interferometer) will be provided, alongside a didactic version of the Aspect-Clauser-Zeilinger experiment on Bell's inequality violation and quantum entanglement, recently adopted by the Liceo M. L. King in Genoa. One aim is to demonstrate the feasibility of teaching contemporary physics at Italian techno-scientific high schools, in connection with student training in laboratory practice and in some advanced but still accessible mathematics. The other is to foster students'effective learning and critical understanding of 20th-century physics, with direct links to nowadays cutting-edge issues like quantum computing and cryptography.