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- W4308355612 abstract "Although quasi-dilaton massive gravity is a well-defined gravitational theory, it exhibits instabilities and suffers from the strong coupling problem. In this work we construct an extension of the theory, through the inclusion of the aether field. Focusing on flat Friedmann-Lemaitre-Robertson-Walker geometry, we show the existence of exact, self-accelerating solutions at the background level, characterized by an effective cosmological constant arising from the graviton mass. Additionally, we perform a detailed perturbation analysis, investigating separately the tensor, vector, and scalar perturbations, extracting the dispersion relation of gravitational waves, and determining the stability conditions for vector and scalar sectors. As we show, there are always regions in the parameter space in which the obtained solutions are free from ghost instabilities, as well as from the strong coupling problem. Hence, although the aether field does not play an important role in the background self-accelerating solutions, it does play a crucial role in the alleviation of the perturbation-related problems of the simple quasi-dilaton massive gravity." @default.
- W4308355612 created "2022-11-11" @default.
- W4308355612 creator A5028149293 @default.
- W4308355612 creator A5037221326 @default.
- W4308355612 creator A5053315008 @default.
- W4308355612 date "2022-11-04" @default.
- W4308355612 modified "2023-10-02" @default.
- W4308355612 title "Aether-quasi-dilaton massive gravity" @default.
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- W4308355612 doi "https://doi.org/10.1103/physrevd.106.103502" @default.