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Garst, Mirlin, Rockstuhl, Schmalian, Shnirman

Montag, 14.00-15.30 Uhr

10-01

Garst, Rockstuhl

Dienstag, 13.00-14.00 Uhr

10-01

Campus Nord, Geb. 425

Freitag, 15.45-17.15 Uhr

Lehmann HS

Donnerstag, 17.15-18.45 Uhr

Lehmann HS

The hidden gauge symmetry of relativistic dissipative hydrodynamics

Seminar über Theoretische Festkörperphysik

Vortragender:

Giorgio Torrieri

Datum:

17.01.2022 14:00

Ort:

Room 10.01, Bldg. 30.23 CS and via Zoom

Zugehörigkeit:

Universidade Estadual de Campinas, Campinas, Sao Paulo, Brazil

Gastgeber:

PD Dr. Igor Gornyi

Abstract

The observation, in hadronic collisions, of "ideal fluid" type
behavior in systems of a comparatively small number of particles,
presents a conceptual puzzle, since the way we usually derive
hydrodynamics is via approximating "many" particles as a continuum.
I will argue that making sense of this requires re-deriving
relativistic hydrodynamics as a "bottom-up" theory, with no reference
to microscopic physics except the local emergence of a thermalized
system.
We attempt to do this using basic statistical mechanics, and find the
appearance of a gauge-like redundancy hidden within relativistic
dissipative hydrodynamics, arising from the fluctuation-dissipation
theorem.
This might lead to the
apparently counter-intuitive conclusion that in the small viscosity
limit it might indeed be that smaller systems could thermalize faster.

Based on https://arxiv.org/abs/2109.06389
and
https://arxiv.org/abs/2007.09224