期刊
PHYSICAL REVIEW D
卷 102, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.102.103524
关键词
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资金
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [646702]
- UK STFC [ST/S000550/1]
- Dennis Sciama Fellowship at the University of Portsmouth
- STFC [ST/S000550/1] Funding Source: UKRI
We introduce a cosmological model in the framework of generalized massive gravity. This theory is an extension of nonlinear massive gravity with a broken translation symmetry in the Stuckelberg space. In a recent work, we showed the existence of cosmological solutions stable against linear perturbations. In the present paper, we build up on the previous result and study the evolution of the background solutions and the linear perturbations. At the background level, we find that the mass terms act like a fluid with time dependent equation of state w < -1 at late times. At linear order, we derive the Poisson's equation. We find that the scalar graviton mode invokes anisotropic stress, which brings a modification with respect to Lambda Cold Dark Matter (LCDM) in the effective Newton's constant and the growth rate of matter perturbations. Moreover, we study the propagation of gravitational waves and find that the tensor modes acquire a time dependent mass.
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