Breaking diffeomorphism invariance and tests for the emergence of gravity
PHYSICAL REVIEW D, vol.81, no.8, 2010 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 81 Issue: 8
- Publication Date: 2010
- Doi Number: 10.1103/physrevd.81.084059
- Journal Name: PHYSICAL REVIEW D
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Open Archive Collection: AVESIS Open Access Collection
- Middle East Technical University Affiliated: No
Abstract
If general relativity is an emergent phenomenon, there may be small violations of diffeomorphism invariance. We propose a phenomenology of perturbatively small violations of general relativity by the inclusion of terms which break general covariance. These can be tested by matching to the parameterized post-Newtonian formalism. The most sensitive tests involve pulsar timing and provide an extremely strong bound, with a dimensionless constraint of order 10(-20) relative to gravitational strength.