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Title: Phenomenological consequences of enhanced bulk viscosity near the QCD critical point

In the proximity of the QCD critical point the bulk viscosity of quark-gluon matter is expected to be proportional to nearly the third power of the critical correlation length, and become significantly enhanced. Here, this work is the first attempt to study the phenomenological consequences of enhanced bulk viscosity near the QCD critical point. For this purpose, we implement the expected critical behavior of the bulk viscosity within a non-boost-invariant, longitudinally expanding 1 + 1 dimensional causal relativistic hydrodynamical evolution at nonzero baryon density. We demonstrate that the critically enhanced bulk viscosity induces a substantial nonequilibrium pressure, effectively softening the equation of state, and leads to sizable effects in the flow velocity and single-particle distributions at the freeze-out. In conclusion, the observable effects that may arise due to the enhanced bulk viscosity in the vicinity of the QCD critical point can be used as complementary information to facilitate searches for the QCD critical point.
Authors:
 [1] ;  [2] ;  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN BNL Research Center; Institute of Theoretical Physics, CNRS URA (France)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Department of Physics
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Department of Physics; Massachusetts Institute of Technology, Cambridge (MA). Center for Theoretical Physics
Publication Date:
Report Number(s):
BNL-113923-2017-JA
Journal ID: ISSN 2469-9985
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 3; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Under Secretary for Science (S-4); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1376097
Alternate Identifier(s):
OSTI ID: 1345856

Monnai, Akihiko, Mukherjee, Swagato, and Yin, Yi. Phenomenological consequences of enhanced bulk viscosity near the QCD critical point. United States: N. p., Web. doi:10.1103/PhysRevC.95.034902.
Monnai, Akihiko, Mukherjee, Swagato, & Yin, Yi. Phenomenological consequences of enhanced bulk viscosity near the QCD critical point. United States. doi:10.1103/PhysRevC.95.034902.
Monnai, Akihiko, Mukherjee, Swagato, and Yin, Yi. 2017. "Phenomenological consequences of enhanced bulk viscosity near the QCD critical point". United States. doi:10.1103/PhysRevC.95.034902. https://www.osti.gov/servlets/purl/1376097.
@article{osti_1376097,
title = {Phenomenological consequences of enhanced bulk viscosity near the QCD critical point},
author = {Monnai, Akihiko and Mukherjee, Swagato and Yin, Yi},
abstractNote = {In the proximity of the QCD critical point the bulk viscosity of quark-gluon matter is expected to be proportional to nearly the third power of the critical correlation length, and become significantly enhanced. Here, this work is the first attempt to study the phenomenological consequences of enhanced bulk viscosity near the QCD critical point. For this purpose, we implement the expected critical behavior of the bulk viscosity within a non-boost-invariant, longitudinally expanding 1 + 1 dimensional causal relativistic hydrodynamical evolution at nonzero baryon density. We demonstrate that the critically enhanced bulk viscosity induces a substantial nonequilibrium pressure, effectively softening the equation of state, and leads to sizable effects in the flow velocity and single-particle distributions at the freeze-out. In conclusion, the observable effects that may arise due to the enhanced bulk viscosity in the vicinity of the QCD critical point can be used as complementary information to facilitate searches for the QCD critical point.},
doi = {10.1103/PhysRevC.95.034902},
journal = {Physical Review C},
number = 3,
volume = 95,
place = {United States},
year = {2017},
month = {3}
}