2013/12/22 by Carlos Hoyos, Bom Soo Kim, Yaron Oz
Physics and Astronomy · #cond-mat.stat-mech #cond-mat.str-el #hep-th #physics.flu-dyn
paper · pdf · doi:10.1007/jhep03(2014)050
24 pages
arxiv created 2013/12/22 · arxiv updated 2015/06/18
We compute the bulk viscosity in holographic models dual to theories with Lifshitz scaling and/or hyperscaling violation, using a generalization of the bulk viscosity formula derived in arXiv:1103.1657 from the null focusing equation. We find that only a class of models with massive vector fields are truly Lifshitz scale invariant, and have a vanishing bulk viscosity. For other holographic models with scalars and/or massless vector fields we find a universal formula in terms of the dynamical exponent and the hyperscaling violation exponent.