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5,107
Axiomatic quantum field theory in curved spacetime
, 2008
"... The usual formulations of quantum field theory in Minkowski spacetime make crucial use of features—such as Poincare invariance and the existence of a preferred vacuum state—that are very special to Minkowski spacetime. In order to generalize the formulation of quantum field theory to arbitrary globa ..."
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Cited by 689 (18 self)
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and covariantly constructed from the spacetime metric), a microlocal spectrum condition, an "associativity" condition, and the requirement that the coefficient of the identity in the OPE of the product of a field with its adjoint have positive scaling degree. We prove curved spacetime versions
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
- IEEE TRANS. INF. THEORY
, 2003
"... We develop and analyze space–time coded cooperative diversity protocols for combating multipath fading across multiple protocol layers in a wireless network. The protocols exploit spatial diversity available among a collection of distributed terminals that relay messages for one another in such a m ..."
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Cited by 622 (5 self)
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. We discuss issues related to space–time code design for these protocols, emphasizing codes that readily allow for appealing distributed versions.
The Cyclical Behavior of Equilibrium Unemployment and Vacancies
- American Economic Review
, 2005
"... This paper argues that a broad class of search models cannot generate the observed business-cycle-frequency fluctuations in unemployment and job vacancies in response to shocks of a plausible magnitude. In the U.S., the vacancy-unemployment ratio is 20 times as volatile as average labor productivity ..."
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Cited by 871 (23 self)
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productivity, while under weak assumptions, search models predict that the vacancy-unemployment ratio and labor productivity have nearly the same variance. I establish this claim both using analytical comparative statics in a very general deterministic search model and using simulations of a stochastic version
Achieving near-capacity on a multiple-antenna channel
- IEEE Trans. Commun
, 2003
"... Recent advancements in iterative processing of channel codes and the development of turbo codes have allowed the communications industry to achieve near-capacity on a single-antenna Gaussian or fading channel with low complexity. We show how these iterative techniques can also be used to achieve nea ..."
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Cited by 402 (2 self)
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near-capacity on a multiple-antenna system where the receiver knows the channel. Combining iterative processing with multiple-antenna channels is particularly challenging because the channel capacities can be a factor of ten or more higher than their single-antenna counterparts. Using a “list ” version
Distributed Space-Time Coded Protocols for Exploiting Cooperative Diversity in Wireless Networks
- IEEE Trans. Inform. Theory
, 2003
"... Abstract — We develop and analyze space-time coded cooperative diversity protocols for combating multipath fading across multiple protocol layers in a wireless network. The protocols exploit spatial diversity available among a collection of distributed terminals that relay messages for one another i ..."
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Cited by 333 (10 self)
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schemes. We discuss issues related to space-time code design for these protocols, emphasizing codes that readily allow for appealing distributed versions. I.
Electronic Journal of Theoretical Physics Dirac Equation in Curved Spacetime On the Anomalous Gyromagnetc Ratio
, 2007
"... Abstract: I propose a curved spacetime version of the Dirac equation. The equation has been developed mainly to try and account in a natural way for the observed anomalous gyromagnetic ratio of Fermions. The derived equation suggests that particles including the Electron which is thought to be a poi ..."
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Abstract: I propose a curved spacetime version of the Dirac equation. The equation has been developed mainly to try and account in a natural way for the observed anomalous gyromagnetic ratio of Fermions. The derived equation suggests that particles including the Electron which is thought to be a
Summarizing Text Documents: Sentence Selection and Evaluation Metrics
- In Research and Development in Information Retrieval
, 1999
"... Human-quality text summarization systems are difficult to design, and even more difficult to evaluate, in part because documents can differ along several dimensions, such as length, writing style and lexical usage. Nevertheless, certain cues can often help suggest the selection of sentences for incl ..."
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Cited by 236 (7 self)
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. The potential linguistic ones were derived from an analysis of news-wire summaries. Toevaluate these features we use a normalized version of precision-recall curves, with a baseline of random sentence selection, as well as analyze the properties of such a baseline. We illustrate our discussions with empirical
Estimating New-Keynesian Phillips curves: A full information maximum likelihood approach
- Journal of Monetary Economics
, 2005
"... The New-Keynesian Phillips curve has recently become an important ingredient in mon-etary policy models. However, using limited information methods, the empirical support for the New-Keynesian Phillips curve appear to be mixed. This paper argues, by means of Monte Carlo simulations with a simple New ..."
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Cited by 198 (6 self)
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used in the Monte Carlo simulations is estimated on U.S. data with FIML and although the pure forward-looking New-Keynesian Phillips curve is rejected, a version with both forward- and backward-looking components provides a reasonable approximation of U.S. inflation dynamics.
A Hierarchical Approach to Interactive Motion Editing for Human-like Figures
, 1999
"... This paper presents a technique for adapting existing motion of a human-like character to have the desired features that are specified by a set of constraints. This problem can be typically formulated as a spacetime constraint problem. Our approach combines a hierarchical curve fitting technique wit ..."
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Cited by 228 (16 self)
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This paper presents a technique for adapting existing motion of a human-like character to have the desired features that are specified by a set of constraints. This problem can be typically formulated as a spacetime constraint problem. Our approach combines a hierarchical curve fitting technique
in Curved Spacetime
, 2009
"... We study the heat kernel for the Laplace type partial differential operator acting on smooth sections of a complex spin-tensor bundle over a generic n-dimensional Riemannian manifold. Assuming that the curvature of the U(1) connection (that we call the electromagnetic field) is constant we compute t ..."
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, which seems to be a new physical effect. I. G. Avramidi and G. Fucci: Non-perturbative QED in Curved Spacetime 1 1
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