Hadronic transport coefficients from the linear σ model at finite temperature

Matthew Heffernan (Department of Physics, McGill University, Montreal, QC, Canada H3A 2T8) ; Sangyong Jeon (Department of Physics, McGill University, Montreal, QC, Canada H3A 2T8) ; Charles Gale (Department of Physics, McGill University, Montreal, QC, Canada H3A 2T8)

We investigate general frameworks for calculating transport coefficients for quasiparticle theories at finite temperature. Hadronic transport coefficients are then computed using the linear σ model (LSM). The bulk viscosity over entropy density (ζ/s) is evaluated in the relaxation time approximation (RTA) and the specific shear viscosity (η/s) and static electrical conductivity (σel/T) are both obtained in the RTA and using a functional variational approach. Results are shown for different values of the scalar-isoscalar hadron vacuum mass with in-medium masses for the interacting fields. The advantages and limitations of the LSM for studies of strongly interacting matter out of equilibrium are discussed and results are compared with others in the literature.

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      "title": "Hadronic transport coefficients from the linear <math><mi>\u03c3</mi></math> model at finite temperature"
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      "source": "APS", 
      "value": "We investigate general frameworks for calculating transport coefficients for quasiparticle theories at finite temperature. Hadronic transport coefficients are then computed using the linear <math><mi>\u03c3</mi></math> model (LSM). The bulk viscosity over entropy density (<math><mrow><mi>\u03b6</mi><mo>/</mo><mi>s</mi></mrow></math>) is evaluated in the relaxation time approximation (RTA) and the specific shear viscosity (<math><mrow><mi>\u03b7</mi><mo>/</mo><mi>s</mi></mrow></math>) and static electrical conductivity (<math><mrow><msub><mi>\u03c3</mi><mi>el</mi></msub><mo>/</mo><mi>T</mi></mrow></math>) are both obtained in the RTA and using a functional variational approach. Results are shown for different values of the scalar-isoscalar hadron vacuum mass with in-medium masses for the interacting fields. The advantages and limitations of the LSM for studies of strongly interacting matter out of equilibrium are discussed and results are compared with others in the literature."
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Published on:
18 September 2020
Publisher:
APS
Published in:
Physical Review C , Volume 102 (2020)
Issue 3
DOI:
https://doi.org/10.1103/PhysRevC.102.034906
arXiv:
2005.12793
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

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