## Abstract

To complement recent work on tests of spacetime symmetry in gravity, cubic curvature couplings are studied using an effective field theory description of spacetime-symmetry breaking. The associated mass-dimension-eight coefficients for Lorentz violation studied do not result in any linearized gravity modifications and instead are revealed in the first nonlinear terms in an expansion of spacetime around a flat background. We consider effects on gravitational radiation through the energy loss of a binary system and we study two-body orbital perturbations using the post-Newtonian metric. Some effects depend on the internal structure of the source and test bodies, thereby breaking the weak equivalence principle for self-gravitating bodies. These coefficients can be measured in Solar-System tests, while binary-pulsar systems and short-range gravity tests are particularly sensitive.

Original language | American English |
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Journal | Physical Review D |

Volume | 94 |

DOIs | |

State | Published - Sep 15 2016 |

## Keywords

- particles & fields
- gravitation
- cosmology & astrophysics

## Disciplines

- Astrophysics and Astronomy
- Cosmology, Relativity, and Gravity
- Physics