Breaking Diffeomorphism Invariance and Tests for the Emergence of Gravity

Details Breaking Diffeomorphism Invariance and Tests for the Emergence of Gravity Breaking Diffeomorphism Invariance and Tests for the Emergence of Gravity

2009-11-23

arxiv.org/abs/0911.4123v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages

Scientific paper

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 Parametrized Post Newtonian (PPN) 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.

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