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research article
Thermalization and hydrodynamics of two-dimensional quantum field theories
April 1, 2022
We consider 2d QFTs as relevant deformations of CFTs in the thermodynamic limit. Using causality and KPZ universality, we place a lower bound on the timescale characterizing the onset of hydrodynamics. The bound is determined parametrically in terms of the temperature and the scale associated with the relevant deformation. This bound is typically much stronger than 1/T, the expected quantum equilibration time. Subluminality of sound further allows us to define a thermodynamic C-function, and constrain the sign of the T(T) over bar term in EFTs.
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Name
SciPostPhys_12_4_119.pdf
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publisher
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openaccess
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CC BY
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669.29 KB
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Adobe PDF
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922e2b252a0ce94ffddd83a1b9454d2a