Galileons in the Sky

Details Galileons in the Sky Galileons in the Sky

2012-04-24

arxiv.org/abs/1204.5492v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted review article to appear in a special volume of the "Comptes Rendus de l'Academie des Sciences" about Dark Energy and

Scientific paper

We review the different frameworks in which Galileon scalar fields have been seen to emerge such an in DGP, New Massive Gravity and Ghost-free massive Gravity and emphasize their relation with the Lovelock invariant in braneworld models. The existence of a non-renormalization theorem for Galileon scalar fields makes them especially attractive candidates for inflation as well as for late-time acceleration. In particular we review the self-accelerating and degravitating branches of solutions present in Galileon models when arising from Massive Gravity and discuss their phenomenology.

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