Speaker
Dr
Lasma ALBERTE
(Ben Gurion University)
Description
We consider non-linear massive gravity with two Stueckelberg
fields in which the diffeomorphism invariance is broken
spontaneously in two of the spacetime directions. This
theory admits a charged anti-de Sitter black brane solution
and has recently been used in holographic context as a bulk
description of a boundary field theory with momentum
dissipation. Here we study the stability of the black brane
solution. We identify the physical degrees of freedom and
determine the healthy regions of the parameter space of the
theory. We find that there is a region in parameter space,
where the theory suffers from ghost instability. We
recognise this as the reason for the instability found in
the previous works on holographic conductivity. We also
rederive the previous results for the holographic
conductivity in a coordinate independent way.
