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Heavy Operators and Hydrodynamic Tails

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arxiv 2006.01139 v3 pith:T3FFYH5P submitted 2020-06-01 hep-th cond-mat.stat-mechcond-mat.str-el

classification hep-thcond-mat.stat-mechcond-mat.str-el
keywords operatorsheavycftschargedimensionhydrodynamicslatethermal
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The late time physics of interacting QFTs at finite temperature is controlled by hydrodynamics. For CFTs this implies that heavy operators -- which are generically expected to create thermal states -- can be studied semiclassically. We show that hydrodynamics universally fixes the OPE coefficients $C_{HH'L}$, on average, of all neutral light operators with two non-identical heavy ones, as a function of the scaling dimension and spin of the operators. These methods can be straightforwardly extended to CFTs with global symmetries, and generalize recent EFT results on large charge operators away from the case of minimal dimension at fixed charge. We also revisit certain aspects of late time thermal correlators in QFT and other diffusive systems.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

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    One-loop real-time density correlations in causal diffusion reduce to known acausal results in the overdamped limit and yield a new universal scaling function in the underdamped limit.

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