Lorentz symmetry in ghost-free massive gravity
Journal Article
·
· Physical Review. D.
- Indiana Univ., Bloomington, IN (United States); Indiana University
- University of Algarve, Faro (Portugal); Univ. of Lisbon (Portugal)
The role of Lorentz symmetry in ghost-free massive gravity is studied, emphasizing features emerging in approximately Minkowski spacetime. The static extrema and saddle points of the potential are determined and their Lorentz properties identified. Solutions preserving Lorentz invariance and ones breaking four of the six Lorentz generators are constructed. Locally, globally, and absolutely stable Lorentz-invariant extrema are found to exist for certain parameter ranges of the potential. Gravitational waves in the linearized theory are investigated. Deviations of the fiducial metric from the Minkowski metric are shown to lead to pentarefringence of the five wave polarizations, which can include superluminal modes and subluminal modes with negative energies in certain observer frames. The Newton limit of ghost-free massive gravity is explored. The propagator is constructed and used to obtain the gravitational potential energy between two point masses. Here, the result extends the Fierz-Pauli limit to include corrections generically breaking both rotation and boost invariance.
- Research Organization:
- Indiana Univ., Bloomington, IN (United States)
- Sponsoring Organization:
- Indiana University; Portuguese Fundação para a Ciência e a Tecnologia; USDOE
- Grant/Contract Number:
- SC0010120
- OSTI ID:
- 1843789
- Journal Information:
- Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 10 Vol. 104; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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