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SUMMARY:Shear viscosity of nucleons and pions in heavy-ion collisions at e
 nergies of NICA
DTSTART;VALUE=DATE-TIME:20201008T145000Z
DTEND;VALUE=DATE-TIME:20201008T150500Z
DTSTAMP;VALUE=DATE-TIME:20260421T231155Z
UID:indico-contribution-2357@cern.ch
DESCRIPTION:Speakers: Evgeny Zabrodin (SINP MSU\; MEPhI\; University of Os
 lo)\nThe shear viscosity is calculated microscopically via\nthe Green-Kubo
  relation in the various snapshots in the central region\nin an ongoing re
 lativistic collision simulated via the UrQMD framework\nfor various bombar
 ding energies in the anticipated NICA experiments.\nIn previous works the 
 shear\nviscosity was calculated as function of temperature\, while the che
 mical\npotential of baryon charge was kept constant. The original idea of 
 this work\nis to extract\, in various time windows\, the average energy\nd
 ensity\, the net baryon density and the small though nonzero net\nstrangen
 ess density. By fitting these parameters to statistical model\,\nwe obtain
  temperature and chemical potentials of baryon charge\nand strangeness. Si
 multaneously\, these parameters are used to start\nsimulation in a box\, a
 gain within the UrQMD transport model. From these\nsimulations the autocor
 relations in time of the energy stress tensor\nare extracted\, and subsequ
 ently via the Green-Kubo identities the\nshear viscosity coefficient of th
 at equilibrium hadronic system is\nobtained. Finally\, the\nevolving and d
 ecreasing shear viscosity coefficient can be given as a\nfunction of time\
 , temperature\, and chemical potentials in the center of\nmass of the syst
 em. For all four collision energies from 10A GeV to\n40A GeV a shear visco
 sity to entropy ratio ($\\eta/S$) typically starts from\n0.3 and then rapi
 dly increases up to and even larger than 1.\nIn addition\, we calculate al
 so partial viscosity both for nucleons and pions.\n\nReferences:\n\n[1] M.
  Teslyk\, L. Bravina\, O. Panova\, O. Vitiuk\, E. Zabrodin\, Phys. Rev. C 
 101 (2020) 014904\n\n[2] E. Zabrodin\, M. Teslyk\, O. Vitiuk\, L. Bravina\
 , Phys. Scr. 95 (2020) 074009\n\nhttps://indico.particle.mephi.ru/event/35
 /contributions/2357/
LOCATION:Zoom Heavy Ion
URL:https://indico.particle.mephi.ru/event/35/contributions/2357/
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