Transport coefficients in Chiral Perturbation Theory

Details Transport coefficients in Chiral Perturbation Theory Transport coefficients in Chiral Perturbation Theory

2006-10-16

arxiv.org/abs/hep-ph/0610197v1

Eur.Phys.J.A31:848-850,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 6 figures, EPJA style. Talk given at the QNP06 conference in Madrid, and accepted for publication in EPJA

Scientific paper

10.1140/epja/i2006-10194-5

We present recent results on the calculation of transport coefficients for a pion gas at zero chemical potential in Chiral Perturbation Theory using Linear Response Theory. More precisely, we show the behavior of DC conductivity and shear viscosity at low temperatures. To compute transport coefficients, the standard power counting of ChPT has to be modified. The effects derived from imposing unitarity are also analyzed. As physical applications in Relativistic Heavy Ion Collisions, we show the relation of the DC conductivity to soft-photon production and phenomenological effects related to a nonzero shear viscosity. In addition, our values for the shear viscosity to entropy ratio satisfy the KSS bound.

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