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Title: Lorentz symmetry in ghost-free massive gravity

Journal Article · · Physical Review. D.

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:
USDOE; Portuguese Fundação para a Ciência e a Tecnologia; Indiana University
Grant/Contract Number:
SC0010120; SFRH/BSAB/150324/2019; UID/FIS/00099/2019
OSTI ID:
1843789
Journal Information:
Physical Review. D., Vol. 104, Issue 10; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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