Covariant renormalizable gravity and its FRW cosmology

Details Covariant renormalizable gravity and its FRW cosmology Covariant renormalizable gravity and its FRW cosmology

2009-05-26

arxiv.org/abs/0905.4213v3

Phys.Rev.D81:043001,2010

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX 5 pages, no figure, Phys. Rev. D published version, title is changed, reference is corrected

Scientific paper

10.1103/PhysRevD.81.043001

We consider the diffeomorphism invariant gravity coupled with the ideal fluid in the non-standard way. The Lorentz-invariance of the graviton propagator in such a theory considered as perturbation over flat background turns out to be broken due to non-standard coupling with the ideal fluid. As a result the behavior of the propagator in the ultraviolet/infrared region indicates that some versions of such theory are (super-)renormalizable ones (with appearance of only physical transverse modes). The FRW cosmology in same cases may be different from the one in General Relativity with the possible quintessence/phantom-like inflationary stage.

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