BLACK HOLES, ENTROPY BOUND AND CAUSALITY VIOLATION
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Publication:3649549
DOI10.1142/S0217751X09047235zbMATH Open1176.83097arXiv0904.4805OpenAlexW3121478595MaRDI QIDQ3649549
Author name not available (Why is that?)
Publication date: 4 December 2009
Published in: (Search for Journal in Brave)
Abstract: The gravity/gauge theory duality has provided us a way of studying QCD at short distances from straightforward calculations in classical general relativity. Among numerous results obtained so far, one of the most striking is the universality of the ratio of the shear viscosity to the entropy density. For all gauge theories with Einstein gravity dual, this ratio is eta/s=1/4pi. However, in general higher-curvature gravity theories, including two concrete models under discussion - the Gauss-Bonnet gravity and the (Riemann)^2 gravity - the ratio eta/s can be smaller than 1/4pi (thus violating the conjecture bound), equal to 1/4pi or even larger than 1/4pi. As we probe spacetime at shorter distances, there arises an internal inconsistency in the theory, such as a violation of microcausality, which is correlated with a classical limit on black hole entropy.
Full work available at URL: https://arxiv.org/abs/0904.4805
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