Journal
PHYSICS LETTERS B
Volume 691, Issue 1, Pages 60-64Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2010.06.007
Keywords
Quantum gravity; String theory
Funding
- MEC (Spain) [FIS2006-02842]
- AGAUR (Catalonia) [2009SGR-994]
- Ministry of Education, Culture, Sports, Science Technology [G07]
- ICREA Funding Source: Custom
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The class of covariant gravity theories which have nice ultraviolet behavior and seem to be (super)-renormalizable is proposed. The apparent breaking of Lorentz invariance occurs due to the coupling with the effective fluid which is induced by Lagrange multiplier constrained scalar field. Spatially-flat FRW cosmology for such covariant field gravity may have accelerating solutions. Renormalizable versions of more complicated modified gravity which depends on Riemann and Ricci tensor squared may be constructed in the same way. (C) 2010 Elsevier B.V. All rights reserved.
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