A Class of Minimally Modified Gravity Theories
General Relativity and Quantum Cosmology
2017-11-01 v1 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
We investigate the Hamiltonian structure of a class of gravitational theories whose actions are linear in the lapse function. We derive the necessary and sufficient condition for a theory in this class to have two or less local physical degrees of freedom. As an application we then find several concrete examples of modified gravity theories in which the total number of local physical degrees of freedom in the gravity sector is two.
Keywords
Cite
@article{arxiv.1708.03757,
title = {A Class of Minimally Modified Gravity Theories},
author = {Chunshan Lin and Shinji Mukohyama},
journal= {arXiv preprint arXiv:1708.03757},
year = {2017}
}
Comments
20 pages, no figure