Comptes Rendus
Galileons in the sky
Comptes Rendus. Physique, Volume 13 (2012) no. 6-7, pp. 666-681.

We review the different frameworks in which Galileon scalar fields have been seen to emerge such as 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.

Nous passons en revue différentes approches dans lesquelles un champ scalaire dit Galiléon apparait comme dans le modèle DGP, la nouvelle gravité massive et la gravité massive sans fantôme. Nous insistons sur le lien avec les invariants de Lovelock dans les modèles de brane. Lʼexistence de théorèmes de non-renormalisation pour ces théories les rend particulièrement attractives pour décrire lʼinflation ou lʼaccélération récente de lʼexpansion de lʼunivers. En particulier, nous nous intéressons aux branches auto-accélérées et dégravitantes des modèles de Galiléons et discutons leur phénoménologie.

Published online:
DOI: 10.1016/j.crhy.2012.04.006
Keywords: Galileon scalar fields, Lovelock invariant, Massive Gravity
Mot clés : Champ scalaire Galiléon, Invariant de Lovelock, Gravité massive

Claudia de Rham 1, 2, 3

1 Départment de physique théorique, université de Genève, 24, quai E. Ansermet, CH-1211 Genève, Switzerland
2 Center for Astroparticle Physics, CH-1211 Geneva, Switzerland
3 Department of Physics, Case Western Reserve University, Euclid Ave, Cleveland, OH 44106, USA
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Claudia de Rham. Galileons in the sky. Comptes Rendus. Physique, Volume 13 (2012) no. 6-7, pp. 666-681. doi : 10.1016/j.crhy.2012.04.006. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2012.04.006/

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Cited by Sources:

Based on work in collaboration with C. Burrage, G. Gabadadze, L. Heisenberg, D. Pirtskhalava, D. Seery, A.J. Tolley and I. Yavin.

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