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Paper   IPM / Astronomy / 16269
School of Astronomy
  Title:   Linear cosmological perturbations in Scalar-tensor-vector gravity
  Author(s): 
1.  Sara . Jamali
2.  Mahmood . Roshan
3.  Luca . Amendola
  Status:   Published
  Journal: Phys. Lett. B
  Vol.:  802
  Year:  2020
  Supported by:            ipm IPM
  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 ΛCDM. 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 σ8, compare to ΛCDM. This point, constitutes a powerful challenge to the cosmological viability of MOG.

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