Towards the nonlinear regime in extensions to GR: assessing possible options
General Relativity and Quantum Cosmology
2019-05-22 v1 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
Testing General Relativity and exploring possible departures has received further input with the possibility to do so through gravitational waves emitted in strongly gravitating/highly dynamical scenarios and also through the availability of exquisitely sensitive cosmological observations. However, most extensions suffer from severe pathologies at the mathematical level which have stymied a thorough exploration of putative theories. With the aid of a model problem which captures typical pathologies, we explore suggested methods to control them. We find that the approach that modifies the equations to control higher-order gradients is both robust and efficient.
Cite
@article{arxiv.1808.07897,
title = {Towards the nonlinear regime in extensions to GR: assessing possible options},
author = {Gwyneth Allwright and Luis Lehner},
journal= {arXiv preprint arXiv:1808.07897},
year = {2019}
}
Comments
11 pages, 6 figures