The radiation instability in modified gravity
General Relativity and Quantum Cosmology
2021-04-21 v2 High Energy Physics - Theory
Abstract
We study the problem of the instability of inhomogeneous radiation universes in quadratic lagrangian theories of gravity written as a system of evolution equations with constraints. We construct formal series expansions and show that the resulting solutions have a smaller number of arbitrary functions than that required in a general solution. These results continue to hold for more general polynomial extensions of general relativity.
Cite
@article{arxiv.2012.05850,
title = {The radiation instability in modified gravity},
author = {Spiros Cotsakis and Dimitrios Trachilis},
journal= {arXiv preprint arXiv:2012.05850},
year = {2021}
}
Comments
v2: 34 pages, references added, version to match the published one