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Equilibration and relaxation times at the chiral phase transition including reheating
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
2012 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 711, no 1, 109-116 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the relaxational dynamics of the order parameter of chiral symmetry breaking, the sigma mean-field, with a heat bath consisting of quarks and antiquarks. A semiclassical stochastic Langevin equation of motion is obtained from the linear sigma model with constituent quarks. The equilibration of the system is studied for a first order phase transition and a critical point, where a different behavior is found. At the first order phase transition we observe the phase coexistence and at a critical point the phenomenon of critical slowing down with large relaxation times. We go beyond existing Langevin studies and include reheating of the heat bath by determining the energy dissipation during the relaxational process. The energy of the entire system is conserved. In a critical point scenario we again observe critical slowing down.

Place, publisher, year, edition, pages
2012. Vol. 711, no 1, 109-116 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-174922DOI: 10.1016/j.physletb.2012.03.059ISI: 000303306700018OAI: oai:DiVA.org:uu-174922DiVA: diva2:529492
Available from: 2012-05-30 Created: 2012-05-30 Last updated: 2017-12-07Bibliographically approved

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Leupold, Stefan

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