The Chern-Simons diffusion rate from higher curvature gravity
High Energy Physics - Theory
2014-05-12 v2 High Energy Physics - Phenomenology
Nuclear Theory
Abstract
An important transport coefficient in the study of non-Abelian plasmas is the Chern-Simons diffusion rate, which parameterizes the rate of transition among the degenerate vacua of a gauge theory. We compute this quantity at strong coupling, via holography, using two theories of gravity with higher curvature corrections, namely Gauss-Bonnet gravity and quasi-topological gravity. We find that these corrections may either increase or decrease the result obtained from Einstein's gravity, depending on the value of the couplings. The Chern-Simons diffusion rate for Gauss-Bonnet gravity decreases as the shear viscosity over entropy ratio is increased.
Cite
@article{arxiv.1403.2681,
title = {The Chern-Simons diffusion rate from higher curvature gravity},
author = {Viktor Jahnke and Anderson Seigo Misobuchi and Diego Trancanelli},
journal= {arXiv preprint arXiv:1403.2681},
year = {2014}
}
Comments
9 pages, 1 figure; v2: minor changes, added references