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Degravitation of the Cosmological Constant in Bigravity

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arxiv 1611.09385 v2 pith:ZUU6IVYG submitted 2016-11-28 gr-qc hep-ph

classification gr-qchep-ph
keywords bigravityconstantcosmologicaldegravitationframeworkarticlechosencombination
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In this article the phenomenon of degravitation of the cosmological constant is studied in the framework of bigravity. It is demonstrated that despite a sizable value of the cosmological constant its gravitational effect can be only mild. The bigravity framework is chosen for this demonstration as it leads to a consistent, ghost-free theory of massive gravity. We show that degravitation takes place in the limit where the physical graviton is dominantly a gauge invariant metric combination. We present and discuss several phenomenological consequences expected in this regime.

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