2009/03/21 by Bao-Chun Li, Mei Huang
Physics and Astronomy · #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions #Theoretical and Computational Physics #hep-ph
paper · pdf · doi:10.1103/physrevd.80.034023
published as Phys.Rev.D80:034023,2009 · 19 pages, 30 figures, 1 table
arxiv created 2009/03/21 · openalex publication_date 2009/08/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We investigate the thermodynamic properties including equation of state, the trace anomaly, the sound velocity, and the specific heat, as well as transport properties like bulk viscosity in the Z(2) and O(4) models in the Hartree approximation of Cornwall-Jackiw-Tomboulis formalism. We study these properties in different cases, e.g. first-order phase transition, second-order phase transition, crossover and the case without phase transition, and discuss the correlation between the bulk viscosity and the thermodynamic properties of the system. We find that the bulk viscosity over entropy density ratio exhibits an upward cusp at the second-order phase transition, and a sharp peak at the first-order phase transition. However, this peak becomes smooth or disappears in the case of crossover. This result supports the idea that the bulk viscosity over entropy density ratio is a better quantity than the shear viscosity over entropy density ratio to locate the critical end point.