Constraints on the second order transport coefficients of an uncharged fluid

Details Constraints on the second order transport coefficients of an uncharged fluid Constraints on the second order transport coefficients of an uncharged fluid

2012-01-23

arxiv.org/abs/1201.4654v1

Physics

High Energy Physics

High Energy Physics - Theory

43 pages

Scientific paper

In this note we have tried to determine how the existence of a local entropy current with non-negative divergence constrains the second order transport coefficients of an uncharged fluid, following the procedure described in \cite{Romatschke:2009kr}. Just on symmetry ground the stress tensor of an uncharged fluid can have 15 transport coefficients at second order in derivative expansion. The condition of entropy-increase gives five relations among these 15 coefficients. So finally the relativistic stress tensor of an uncharged fluid can have 10 independent transport coefficients at second order.

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