Kasner geometries inside holographic superconductors

A bstract The recent study of holographic superconductors has shown the emergence a Kasner universe behind event horizon. This paper serves to add discussion by introducing two modifications superconductor model: an axion field term and Einstein-Maxwell-scalar (EMS) coupling term. We first discuss effect modification parameters have on condensate then explore black hole interior dynamics. Features previously identified in are found model presented, including collapse Einstein-Rosen bridge, Josephson oscillations inversions/transitions. However, we find that increasing EMS parameter, does not occur near axion-Reissner-Nordström horizon no longer present; geometry entering into regime after large- r instead.