Vacuum properties of nonsymmetric gravity in de Sitter space

Details Vacuum properties of nonsymmetric gravity in de Sitter space Vacuum properties of nonsymmetric gravity in de Sitter space

2007-03-07

arxiv.org/abs/gr-qc/0703050v1

JCAP 0705:010,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

32 pages, 2 eps figures

Scientific paper

10.1088/1475-7516/2007/05/010

We consider quantum effects of a massive antisymmetric tensor field on the dynamics of de Sitter space-time. Our starting point is the most general, stable, linearized Lagrangian arising in nonsymmetric gravitational theories (NGTs), where part of the antisymmetric field mass is generated by the cosmological term. We construct a renormalization group (RG) improved effective action by integrating out one loop vacuum fluctuations of the antisymmetric tensor field and show that, in the limit when the RG scale goes to zero, the Hubble parameter -- and thus the effective cosmological constant -- relaxes rapidly to zero. We thus conclude that quantum loop effects in de Sitter space can dramatically change the infrared sector of the on-shell gravity, making the expansion rate insensitive to the original (bare) cosmological constant.

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