{"id":929885,"date":"2022-10-30T21:46:06","date_gmt":"2022-10-30T21:46:06","guid":{"rendered":"https:\/\/projects.ift.uam-csic.es\/holotube\/?p=929885"},"modified":"2022-11-11T15:33:51","modified_gmt":"2022-11-11T15:33:51","slug":"november-1-relativistic-hydrodynamics-a-singulant-perspective-by-alexandre-serantes","status":"publish","type":"post","link":"https:\/\/projects.ift.uam-csic.es\/holotube\/2022\/10\/30\/november-1-relativistic-hydrodynamics-a-singulant-perspective-by-alexandre-serantes\/","title":{"rendered":"November 1: “Relativistic hydrodynamics: a singulant perspective” by Alexandre Serantes"},"content":{"rendered":"\n
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Date : November 1, 2022, 16:00 CET<\/strong> <\/p>\n\n\n\n

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Alexandre Serantes<\/strong><\/strong> (University of Barcelona)<\/p>\n<\/div><\/div>\n\n\n\n

Link:<\/strong> https:\/\/zoom.us\/j\/98260147834?pwd=VW5BQStqUGUrUFFzWG1jL2tuWXJoZz09<\/a><\/p>\n\n\n\n

Relativistic hydrodynamics: a singulant perspective<\/strong><\/p>\n\n\n\n

Abstract: The formulation of relativistic hydrodynamics in an effective field theory language rests on a gradient expansion around local thermal equilibrium. Until recently, our understanding of the large-order behavior of this gradient expansion was restricted to two limiting scenarios: generic fluid flows in the linear response regime and nonlinear comoving flows highly constrained by symmetries. In this talk, I will first provide new evidence demonstrating that, at the nonlinear level, the gradient expansion is a factorially divergent series beyond comoving flows. Then, I will discuss how singulants offer a new perspective to understand the asymptotic behavior of the gradient expansion in general situations. Singulants emerge from a dramatic reorganization of the gradient expansion at large orders. I will show that they obey simple equations of motion dictated by linear response around the local state of the fluid, and I will provide explicit examples where they rule the optimal truncation of the gradient expansion.<\/p>\n<\/div><\/div>\n\n\n