1206.2421 (Yu Nakayama)

Intrinsic ambiguity in second order viscosity parameters in relativistic
hydrodynamics    [PDF]

Yu Nakayama

We show that relativistic hydrodynamics in Minkowski space-time has intrinsic ambiguity in second order viscosity parameters in the Landau-Lifshitz frame. This stems from the possibility of improvements of energy-momentum tensor. There exist at least two viscosity parameters which can be removed by using this ambiguity in scale invariant hydrodynamics in (1+3) dimension, and seemingly non-conformal hydrodynamic theories can be hiddenly conformal invariant.

View original: http://arxiv.org/abs/1206.2421