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Paper   IPM / Astronomy / 17584
School of Astronomy
  Title:   Dynamic dark energy from the local limit of nonlocal gravity
1.  J. Tabatabaei
2.  A. Banihashemi
3.  Sh. Baghram
4.  B. Mashhoon
  Status:   Published
  Journal: Int. Journal of Modern Physics D
  Vol.:  32
  Year:  2023
  Supported by:            ipm IPM
Nonlocal gravity (NLG), a classical extension of Einsteinâ??s theory of gravitation, has been studied mainly in linearized form. In particular, nonlinearities have thus far prevented the treatment of cosmological models in NLG. In this essay, we discuss the local limit of NLG and apply this limit to the expanding homogenous and isotropic universe. The theory only allows spatially flat cosmological models; furthermore, de Sitter spacetime is forbidden. The components of the model will have different dynamics with respect to cosmic time as compared to the standard �? CDM model; specifically, instead of the cosmological constant, the modified flat model of cosmology involves a dynamic dark energy component in order to account for the accelerated phase of the expansion of the universe

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