Journal of High Energy Physics

, 2012:31

Cleaning up the cosmological constant

Article

Abstract

We present a novel idea for screening the vacuum energy contribution to the overall value of the cosmological constant, thereby enabling us to choose the bare value of the vacuum curvature empirically, without any need to worry about the zero-point energy contributions of each particle. The trick is to couple matter to a metric that is really a composite of other fields, with the property that the square-root of its determinant is the integrand of a topological invariant, and/or a total derivative. This ensures that the vacuum energy contribution to the Lagrangian is non-dynamical. We then give an explicit example of a theory with this property that is free from Ostrogradski ghosts, and is consistent with solar system physics and cosmological tests.

Keywords

Cosmology of Theories beyond the SM Classical Theories of Gravity 

Copyright information

© SISSA, Trieste, Italy 2012

Authors and Affiliations

  1. 1.School of Physics and AstronomyUniversity of NottinghamNottinghamU.K.

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