On solutions of minimal massive 3D gravity

Abstract

We look at solutions of minimal massive gravity (MMG), a generalization of topologically massive gravity that improves upon its holographic properties. It is shown that generically (in MMG parameter space) all conformally flat solutions of vacuum MMG are locally isometric to one of the two (A)dS vacua of the theory. We then couple a scalar field, and find that domain wall solutions can only interpolate between these two vacua precisely when the bulk graviton is tachyonic. Finally, we find a non-BTZ AdS black hole solution satisfying Brown–Henneaux boundary conditions, which lies within the ‘bulk/ boundary unitarity region’.