2017/08/16 by Tudor Ciobanu, Ciobanu, Tudor, David M. Ramirez +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #High-Energy Particle Collisions Research
paper · pdf · doi:10.48550/arxiv.1708.04997
In this paper we investigate the behavior of the shear hydrodynamic response functions in a simple holographic model exhibiting momentum relaxation. We compute several stress tensor response functions in the transverse channel, and from there derive the ratio of shear viscosity to entropy density, η/s, using two different methods. The two values differ from each other, one which satisfies the KSS bound η/s ≥ (1)/(4π) and one which does not, and we discuss the causes and implications of this result.