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- Title
Effects of Rastall parameter on perturbation of dark sectors of the Universe.
- Authors
Ziaie, A. H.; Shabani, H.; Ghaffari, S.
- Abstract
In recent years, Rastall gravity is undergoing a considerable surge in popularity. This theory purports to be a modified gravity theory with a non-conserved energy–momentum tensor (EMT) and an unusual non-minimal coupling between matter and geometry. This work looks for the evolution of homogeneous spherical perturbations within the Universe in the context of Rastall gravity. Using the spherical Top-Hat collapse model, we seek for exact solutions in linear regime for density contrast of dark matter (DM) and dark energy (DE). We find that the Rastall parameter affects crucially the dynamics of density contrasts for DM and DE and the fate of spherical collapse is different in comparison to the case of general relativity (GR). Numerical solutions for perturbation equations in nonlinear regime reveal that DE perturbations could amplify the rate of growth of DM perturbations depending on the values of Rastall parameter.
- Subjects
NUMERICAL solutions to equations; GENERAL relativity (Physics); UNIVERSE; DARK matter; NONLINEAR equations
- Publication
Modern Physics Letters A, 2021, Vol 36, Issue 30, p1
- ISSN
0217-7323
- Publication type
Article
- DOI
10.1142/S0217732321500826