Linear cosmological perturbations in Scalar-tensor-vector gravity

Abstract

We investigate the cosmological perturbations in the context of a Scalar-Tensor-Vector theory of Gravity known as MOG in the literature. Recent investigations show that MOG reproduces a viable background cosmological evolution comparable to $\Lambda$CDM. However, the matter-dominated era is slightly different. In this paper, we study the linear matter perturbations and estimate the relevant modified gravity parameters. We show that MOG reduces the growth rate of the perturbations and comparing with the RSD data reveals that MOG suggests a higher value for ${\sigma }_8$, compare to $\Lambda$CDM. This point, constitutes a powerful challenge to the cosmological viability of MOG.

arXiv comment7 pages, accepted version

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• Dark matters on the scale of galaxies
• MOG cosmology without dark matter and the cosmological constant
• Barred spiral galaxies in modified gravity theories
• Growth of matter density perturbations in 4D Einstein-Gauss-Bonnet gravity
• Testing Modified Gravity theory (MOG) with Type Ia Supernovae, Cosmic Chronometers and Baryon Acoustic Oscillations
• Cosmology in theories with derivative matter coupling