BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Fluid dynamics of out of equilibrium boost invariant plasmas
DTSTART;VALUE=DATE-TIME:20180515T091000Z
DTEND;VALUE=DATE-TIME:20180515T093000Z
DTSTAMP;VALUE=DATE-TIME:20210125T072121Z
UID:indico-contribution-2869796@indico.cern.ch
DESCRIPTION:Speakers: Li Yan (McGill University)\nWe establish a set of eq
uations for moments of the distribution function. On the one hand\, these
equations generalize the fluid dynamics to the out-of-equilibrium evolutio
n of boost invariant plasmas. On the other hand\, they systematically gene
ralize the theoretical framework of viscous hydrodynamics to arbitrary ord
ers. These moments quantify details of the momentum anisotropies of out-of
-eqilibrium phase space distributions. The evolution of these moments meas
ures the evolution of systems towards thermalization to a finer level\, be
yond the commonly used ratio of longitudinal to transverse pressures. In t
he hydrodynamical regime\, these moments are found to correspond to viscou
s corrections. In the relaxation time approximations\, these moments obey
a coupled set of equations that can be truncated order-by-order. Truncatio
ns at the lowest orders give rise to the exact form of the second order an
d third order viscous hydrodynamic equations of motion for the Bjorken flo
w. Solving the equations of the moments\, we are able to identify an attra
ctor solution that controls a transition from a free streaming fixed point
to a hydrodynamic fixed point. In particular\, this attractor solution pr
ovides a renormalization of the effective value of the shear viscosity to
entropy density ratio\, η/s\, taking into account off-equilibrium effects
.\n\n\n[1] Jean-Paul Blaizot\, Li Yan\, JHEP 1711(2017) 161\, arXiv:1703.1
0694\n[2] Jean-Paul Blaizot\, Li Yan\, arXiv:1712.03856\n\nhttps://indico.
cern.ch/event/656452/contributions/2869796/
LOCATION:Palazzo del Casinò Sala Mosaici-1\, 3rd Floor
URL:https://indico.cern.ch/event/656452/contributions/2869796/
END:VEVENT
END:VCALENDAR