Self-gravitating fluid solutions of Shape Dynamics
arXiv:1606.01215 · doi:10.1103/PhysRevD.94.064023
Abstract
Shape Dynamics is a 3D conformally invariant theory of gravity which possesses a large set of solutions in common with General Relativity. When looked closely, these solutions are found to behave in surprising ways, so in order to probe the fitness of Shape Dynamics as a viable alternative to General Relativity one must find and understand increasingly more complex, less symmetrical exact solutions, on which to base perturbative studies and numerical analyses in order to compare them with data. Spherically symmetric exact solutions have been studied, but only in a static vacuum setup. In this work we construct a class of time-dependent exact solutions of Shape Dynamics from first principles, representing a central inhomogeneity in an evolving cosmological environment. By assuming only a perfect fluid source in a spherically symmetric geometry we show that this fully dynamic non-vacuum solution satisfies in all generality the Hamiltonian structure of Shape Dynamics. The simplest choice of solutions is shown to be a member of the McVittie family.
9 pages
References in corpus (6)
- McVittie's Legacy: Black Holes in an Expanding Universe
- Einstein gravity as a 3D conformally invariant theory
- How the expansion of the universe determines the causal structure of McVittie spacetimes
- Particle and photon orbits in McVittie spacetimes
- Cosmic Censorship in Lorentz Violating Theories of Gravity
- Quasilocal approach to general universal horizons