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Dynamic Dark Energy from the Local Limit of Nonlocal Gravity
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abstract
Nonlocal gravity (NLG), a classical extension of Einstein'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 $\Lambda$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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Cited by 1 Pith paper
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Dwarf galaxies in non-local gravity
Non-local gravity can fit the velocity dispersions of eight dwarf spheroidals without dark matter, but its scale parameter is poorly constrained and two galaxies show tension with earlier rotation-curve results.
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