期刊
PHYSICAL REVIEW D
卷 81, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.043001
关键词
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资金
- Japan Society for the Promotion of Science [G07]
- MICINN (Spain) [FIS2006-02842, PIE2007-50I023]
- LRSS Project [N. 2553.2008.2]
- ICREA Funding Source: Custom
We consider the diffeomorphism invariant gravity coupled with the ideal fluid in the nonstandard 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 the nonstandard 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 Friedmann-Robertson-Walker cosmology in some cases may be different from the one in general relativity with the possible power law inflationary stage.
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