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Cleaning up the cosmological constant · Around

2012

Cleaning up the cosmological constant

Kimpton, Ian, Padilla, Antonio

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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.

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Similar

C. Charmousis, E. J. Copeland, A. Padilla and P. M. Saffin, arXiv:1106.2000 [hep-th]. C. Charmousis, E. J. Copeland, A. Padilla and P. M. Saffin, arXiv:1112.4866 [hep-th]
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T. Clifton, P. G. Ferreira, A. Padilla, C. Skordis, [arXiv:1106.2476 [astro-ph.CO]]
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Then

F. Bauer, J. Sola, H. Stefancic, JCAP 1012
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2010
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