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Charged eigenstate thermalization, Euclidean wormholes and global symmetries in quantum gravity

Published inSciPost physics, vol. 12, no. 2, 059
Publication date2022-02-11
First online date2022-02-11
Abstract

We generalize the eigenstate thermalization hypothesis to systems with global symmetries. We present two versions, one with microscopic charge conservation and one with exponentially suppressed violations. They agree for correlation functions of simple operators, but differ in the variance of charged one-point functions at finite temperature. We then apply these ideas to holography and to gravitational low-energy effective theories with a global symmetry. We show that Euclidean wormholes predict a non-zero variance for charged one-point functions, which is incompatible with microscopic charge conservation. This implies that global symmetries in quantum gravity must either be gauged or explicitly broken by non-perturbative effects.

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Citation (ISO format)
BELIN, Alexandre et al. Charged eigenstate thermalization, Euclidean wormholes and global symmetries in quantum gravity. In: SciPost physics, 2022, vol. 12, n° 2, p. 059. doi: 10.21468/scipostphys.12.2.059
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ISSN of the journal2542-4653
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