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In a first part, we justify the feasibility of substituting a photon leg by a neutrino current in the Euler-Heisenberg Lagrangian to obtain an effective Lagrangian for the process γν → γγν and its crossed reactions. We establish the link... more
Aims. To investigate the efficiency of centrifugal acceleration of particles as a possible mechanism for the generation of ultra-high γ-ray nonthermal emission from TeV blazars, we study the centrifugal acceleration of electrons by... more
Neutrino Oscillations in the presence of strong gravitational fields are studied specifically for Majorana neutrinos. We look at ultra high energy neutrinos $(\sim 1$ PeV) emanating from Active Galactic Nuclei (AGN). Fluxes of different... more
The AMANDA neutrino detector has been in operation since the start of the austral winter of 1997. The analysis of the initial year of data taking has produced a 90% confidence level upper limit on an E -2 flux of muon-neutrinos, at the... more
KASCADE-Grande and its original array of KASCADE were dedicated to measure individual air showers of cosmic rays with great detail in the primary energy range of 100 TeV up to 1 EeV. The experiment has significantly contributed to... more
The Auger Observatory will be the largest air shower array ever built. This array of water Cherenkov pools offers the unique advantage of a large acceptance at very low zenith angle. Auger is therefore very well suited for studying... more
The energy reconstruction of extensive air showers measured with the LOFAR Radboud Air Shower Array (LORA) is presented in detail. LORA is a particle detector array located in the center of the LOFAR radio telescope in the Netherlands.... more
One of the main aims of KASCADE is the determination of flux spectra for different primary cosmic ray mass groups to disentangle the knee feature. The field detector array of the KASCADE experiment measures the electron and muon component... more
Detailed investigations of extensive air showers have been performed with the data measured by the KASCADE experiment. The results allow to evaluate hadronic interaction models, used in simulations to interpret air shower data. The... more
Future manned missions in deep space toward Moon and Mars represent one of the greatest challenges for radiological protection, which task is to mitigate risks for human life raised by the hostile space radiation environment. The... more
A search for Cerenkov emission in the radio-frequency range resulting from the particle cascade of an ultrahigh-energy neutrino on the near surface of the Moon is described. The expected pulse of 1-ns duration, dispersed by propagation... more
When uploading their final published article to a repository, authors should include a credit line and a link to the article on the OUP website. This will guarantee that the definitive version is readily available to those accessing your... more
Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of the cosmic rays with the highest-energies, which are correlated with the positions of relatively nearby active galactic nuclei... more
From direct observations of the longitudinal development of ultra-high energy air showers performed with the Pierre Auger Observatory, upper limits of 3.8%, 2.4%, 3.5% and 11.7% (at 95% c.l.) are obtained on the fraction of cosmic-ray... more
The average extensive air shower longitudinal development profile as a function of shower age in the energy range from 10 17 to 10 18 eV is measured using data from the hybrid HiRes/MIA experiment. An angular bin signal based Cerenkov... more
We present a semi-analytic calculation of the tau-lepton flux emerging from the Earth, induced by the incident high energy neutrinos interacting inside the Earth for 10 5 ≤ E ν /GeV ≤ 10 10 . We obtain results for the energy dependence of... more
A new scheme is proposed in order to deduce an equation of motion for a spinless charged point particle leading to an equivalent Landau-Lifshitz equation of motion. Consequently Larmor's formula must be substituted by a new expression for... more
Abstract. Chain of calculations which have to be performed to predict any kind of signal in a deep underwater/ice neutrino detector necessarily includes the lepton propagation through thick layers of matter, as neutrino can be observed... more
We discuss the observability of neutrino-induced sphaleron transitions in the IceCube detector, encouraged by a recent paper by Tye and Wong (TW), which argued on the basis of a Bloch wave function in the periodic sphaleron potential that... more
Under the assumption that some part of the observed highest energy cosmic rays consists of protons originating from cosmological distances, we derive bounds on the associated flux of neutrinos generated by inelastic processes with the... more
In scenarios with extra dimensions and TeV-scale quantum gravity, black holes are expected to be produced in the collision of light particles at center-of-mass energies above the fundamental Planck scale with small impact parameters.... more
Recently the possibility was widely discussed that a large fraction of the highest energy cosmic rays may be decay products of Z bosons which were produced in the resonant annihilation of ultrahigh energy cosmic neutrinos on cosmological... more
The semi-annual alternation between polar day and polar night causes the South Pole atmosphere to undergo a large annual change. Seasonal changes of the atmosphere highly affect the properties of cosmic ray air showers. IceCube detects... more
Lorentz symmetry violation (LSV) at Planck scale can be tested (see e.g. physics/0003080) through ultra-high energy cosmic rays (UHECR). In a deformed Lorentz symmetry (DLS) pattern where the effective LSV parameter varies like the square... more
The BICEP2 collaboration reports a B-mode polarization of the cosmic microwave background (CMB) radiation inconsistent with the null hypothesis at a significance of > 5 σ. This recent and potentially important result is being often... more
The possibility that Pamir data at very high energy cannot be fully explained by standard physics has recently led to the suggestion that the peculiar jet structure observed above ∼ 10 16 eV could be due to a suppression of effective... more
Detection of 100 GHz-band Signal in the Free-Running Condition Using MZM-Based Flat Comb Generator 横国大工 ,情報通信研究機構 2 桐ヶ谷 茉夕 ,諸橋 功 ,金子 優太 ,片山 郁文 , 入交 芳久 ,坂本 高秀 ,関根 徳彦 ,笠松 章史 ,寳迫 厳 2 Yokohama National Univ. , NICT Mayu Kirigaya, Isao... more
Optical vortex THz pulse generation using Tsurupica spiral phase plate 情通機構,浜崎淳一,関根徳彦,笠松章史,寳迫巌 NICT, J. Hamazaki, N. Sekine, A. Kasamatsu, and I. Hosako E-mail: hamazaki@nict.go.jp 光渦は、発生の簡易さから、これまで主に可視~近赤外領域で研究されてきた。最近になり、THz... more
Astrophysical neutrinos are excellent probes of astroparticle physics and high-energy physics. With energies far beyond solar, supernovae, atmospheric, and accelerator neutrinos, high-energy and ultrahigh-energy neutrinos probe... more
Cosmological redshift has long been interpreted as a product of metric expansion and Doppler recession. In this paper, we propose an alternative view grounded in Sixta Theory: that redshift arises from phase displacement in a harmonically... more
Detector technology will determine what is scientifically possible in far-infrared and millimeter-wave astrophysics in the next decade. Focal planes with large, background-limited detector arrays will be the enabling capability for... more
Accurate measurements of the lateral distribution of extensive air showers produced by cosmic rays of energy greater than 10 17 eV were made in the 1970s by Linsley. At the time, the state of knowledge about the best hadronic interaction... more
Construction of the first stage of the Pierre Auger Observatory has begun. The aim of the Observatory is to collect unprecedented information about cosmic rays above 10 18 eV: The first phase of the project, the construction and operation... more
The Cosmic-Ray Extremely Distributed Observatory (CREDO) is a newly formed, global collaboration dedicated to observing and studying cosmic rays (CR) and cosmic-ray ensembles (CRE): groups of at least two CR with a common primary... more
The 2004 Dec. 27 giant γ-ray flare detected from the magnetar SGR 1806-20 created an expanding radio nebula which we have monitored with the Australia Telescope Compact Array and the Very Large Array. These data indicate that there was an... more
The main objective of the NUCLEON satellite mission is direct measurements of the elemental energy spectra of high-energy (10 11 -10 15 eV) cosmic rays with Kinematic Lightweight Energy Meter (KLEM) device. The design of the instrument... more
Cosmic ray ultra-relativistic nucleus-nucleus collision events in the TeV/A region are analyzed. The average transverse momentum of non-peripheral events is examined and the breakdown of the limiting behaviour of this quantity is observed... more
We analyze the conditions that enable acceleration of particles to ultra-high energies, ∼ 10 20 eV (UHECRs). We show that broad band photon data recently provided by WMAP, ISOCAM, Swift and Fermi satellites, yield constraints on the... more
The JEM-EUSO observatory on board of the International Space Station (ISS) is a proposed pioneering space mission devoted to the investigation of Ultra High Energy Cosmic Rays (UHECRs). Looking downward at the earth's atmosphere with a 60... more
A semi-analytic approach is developed for dealing with the tau-lepton flux emerging from the Earth, induced by the incident high energy tau neutrinos interacting inside the Earth for 10 5 ≤ E ν /GeV ≤ 10 10 . We obtain results for the... more
We have performed a detailed Monte Carlo (MC) simulation for the Advanced Thin Ionization Calorimeter (ATIC) detector using the MC code FLUKA-2006 which is capable of simulating particles up to 10 PeV. The ATIC detector has completed two... more
The Advanced Thin Ionization Calorimeter (ATIC) program files a fully active Bismuth Germanate (BGO) calorimeter preceded by a 0.75 interaction length graphite target with a silicon charge detector, to measure the charge and energy of... more