A Quantum Gravitational Relaxation of The Cosmological Constant

Details A Quantum Gravitational Relaxation of The Cosmological Constant A Quantum Gravitational Relaxation of The Cosmological Constant

2005-03-18

arxiv.org/abs/hep-th/0503146v1

Phys.Lett. B629 (2005) 53-59

Physics

High Energy Physics

High Energy Physics - Theory

6 pages

Scientific paper

10.1016/j.physletb.2005.09.026

Similar to QCD, general relativity has a $\Theta$ sector due to large diffeomorphisms. We make explicit, for the first time, that the gravitational CP violating $\Theta$ parameter is non-perturbatively related to the cosmological constant. A gravitational pseudoscalar coupling to massive fermions gives rise to general relativity from a topological $B\wedge F$ theory through a chiral symmetry breaking mechanism. We show that a gravitational Peccei-Quinn like mechanism can dynamically relax the cosmological constant.

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