Transport properties of a meson gas

Abstract

We present recent results on a systematic method to calculate transport coefficients for a meson gas (in particular, we analyze a pion gas) at low temperatures in the context of Chiral Perturbation Theory. Our method is based on the study of Feynman diagrams with a power counting which takes into account collisions in the plasma by means of a non-zero particle width. In this way, we obtain results compatible with analysis of Kinetic Theory with just the leading order diagram. We show the behavior with temperature of electrical and thermal conductivities and shear and bulk viscosities, and we discuss the fundamental role played by unitarity. We obtain that bulk viscosity is negligible against shear viscosity near the chiral phase transition. Relations between the different transport coefficients and bounds on them based on different theoretical approximations are also discussed. We also comment on some applications to heavy-ion collisions.

arXiv comment4 pages, 4 figures, IJMPE style. Contribution to the International Workshop X Hadron Physics (2007), Florianopolis, Brazil. Accepted for publication in IJMPE; 1 typo corrected

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• On the Strongly-Interacting Low-Viscosity Matter Created in Relativistic Nuclear Collisions
• The Bulk Viscosity of High-Temperature QCD
• The Viscosity of Meson Matter
• Interferometry of Direct Photons in Central 280Pb+208Pb Collisions at 158A GeV

Cited by in corpus (16)

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• Transport coefficients and resonances for a meson gas in Chiral Perturbation Theory
• Bulk viscosity and the conformal anomaly in the pion gas
• Transport coefficients of a hot QCD medium and their relative significance in heavy-ion collisions
• Shear and Bulk Viscosities of Quark Matter from Quark-Meson Fluctuations in the Nambu--Jona-Lasinio model
• A real-time thermal field theoretical analysis of Kubo-type shear viscosity : Numerical understanding with simple examples
• Shear viscosity due to the Landau damping from quark-pion interaction
• Shear viscosity of pion gas due to $\rho \pi \pi$ and $\sigma \pi \pi$ interactions
• The nucleon thermal width due to pion-baryon loops and its contribution in Shear viscosity
• Electrical and thermal conductivities of hot and dense hadron gas
• $\eta /s$ and Phase Transitions
• Medium effects on the thermal conductivity of a hot pion gas
• Hadron resonance gas with repulsive mean field interaction: Thermodynamics and transport properties
• Estimating transport coefficients of interacting pion gas with K-matrix cross sections
• Chemical nonequilibrium for interacting bosons: applications to the pion gas
• Low mass enhanced probability of pion in hadronic matter due to its Landau cut contributions