De Sitter Galileon

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Published 26 May 2011 Published under licence by IOP Publishing Ltd
, , Citation Clare Burrage et al JCAP05(2011)025 DOI 10.1088/1475-7516/2011/05/025

1475-7516/2011/05/025

Abstract

We generalize the Galileon symmetry and its relativistic extension to a de Sitter background. This is made possible by studying a probe-brane in a flat five-dimensional bulk using a de Sitter slicing. The generalized Lovelock invariants induced on the probe brane enjoy the induced Poincaré symmetry inherited from the bulk, while living on a de Sitter geometry. The non-relativistic limit of these invariants naturally maintain a generalized Galileon symmetry around de Sitter while being free of ghost-like pathologies. We comment briefly on the cosmology of these models and the extension to the AdS symmetry as well as generic FRW backgrounds.

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10.1088/1475-7516/2011/05/025