Revisiting scalar and tensor perturbations in a nonlocal gravity
arXiv:2001.00772 · doi:10.1103/PhysRevD.100.124059
Abstract
Nonlocal RT gravity is a successful modified gravity theory, which not only explains the late-time cosmic acceleration but also behaves well in the solar system. Previous analysis generally assumes the auxiliary field vanishes at the cosmic background. However, we find the background is proportional to with the expansion of the universe. Then we discuss the influence of the nonzero background on the cosmic background evolution, the scalar and tensor perturbations. We find the cosmic background evolution is independent of , and the influence of the nonzero background on the weak field limit at solar system scales is negligible. For the tensor perturbation, we find the only possible observable effect is the influence of nonzero background on the LIGO gravitational wave amplitude and also luminosity distance. Future high redshift gravitational wave observations could be used to constrain the background value of .
5 pages, PRD in press
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