John Golden

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GMM sample statistic log-likelihoods for text-independent speaker recognition

5th European Conference on Speech Communication and Technology (Eurospeech 1997)

A novel approach to scoring Gaussian mixture mod-els is presented. Feature vectors are assigned t... more

Automatic topic identification for two-level call routing

1999 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258), 1999

This paper presents an approach to routing telephone calls automatically, based upon their speech... more This paper presents an approach to routing telephone calls automatically, based upon their speech content. Our data consist of a set of calls collected from a customer-service center with a twolevel menu, which allows jumping past the second level, and we view the routing of these calls as a topic-identification problem. Our topic identifier employs a multinomial model for keyword occurrences. We describe the call-routing task in detail, discuss the multinomial model, and present experiments which investigate several issues that arise from using the model for this task.

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$Research paper thumbnail of No unitary bootstrap for the fractal Ising model$

No unitary bootstrap for the fractal Ising model

Journal of High Energy Physics, 2015

We consider the conformal bootstrap for spacetime dimension 1 < d < 2. We determine bounds on ope... more We consider the conformal bootstrap for spacetime dimension 1 < d < 2. We determine bounds on operator dimensions and compare our results with various theoretical and numerical models, in particular with resummed -expansion and Monte Carlo simulations of the Ising model on fractal lattices. The bounds clearly rule out that these models correspond to unitary conformal field theories. We also clarify the d → 1 limit of the conformal bootstrap, showing that bounds can be -and indeed are -discontinuous in this limit. This discontinuity implies that for small = d -1 the expected critical exponents for the Ising model are disallowed, and in particular those of the d -1 expansion. Altogether these results strongly suggest that the Ising model universality class cannot be described by a unitary CFT below d = 2. We argue this also from a bootstrap perspective, by showing that the 2 ≤ d < 4 Ising "kink" splits into two features which grow apart below d = 2.

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