Nonequilibrium chiral fluid dynamics including dissipation and noise
2011 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 84, no 2, 024912- p.Article in journal (Refereed) Published
We present a consistent theoretical approach for the study of nonequilibrium effects in chiral fluid dynamics within the framework of the linear sigma model with constituent quarks. Treating the quarks as an equilibrated heat bath, we use the influence functional formalism to obtain a Langevin equation for the sigma field. This allows us to calculate the explicit form of the damping coefficient and the noise correlators. For a self-consistent derivation of both the dynamics of the sigma field and the quark fluid, we have to employ the 2PI (two-particle irreducible) effective action formalism. The energy dissipation from the field to the fluid is treated in the exact formalism of the 2PI effective action where a conserved energy-momentum tensor can be constructed. We derive its form and comment on approximations generating additional terms in the energy-momentum balance of the entire system.
Place, publisher, year, edition, pages
2011. Vol. 84, no 2, 024912- p.
IdentifiersURN: urn:nbn:se:uu:diva-158587DOI: 10.1103/PhysRevC.84.024912ISI: 000294266700005OAI: oai:DiVA.org:uu-158587DiVA: diva2:440411