Effective theories of a scalar $phi$ invariant under the internal extitgalileon symmetry $phi ophi+b_mu x^mu$ have been extensively studied due to their special theoretical and phenomenological properties. In this paper, we introduce the notion of extitweakly broken galileon invariance, which characterizes the unique class of couplings of such theories to gravity that maximally retain their defining symmetry. The curved-space remnant of the galileon's quantum properties allows to construct (quasi) de Sitter backgrounds largely insensitive to loop corrections. We exploit this fact to build novel cosmological models with interesting phenomenology, relevant for both inflation and late-time acceleration of the universe.

Weakly broken galileon symmetry

SANTONI, LUCA;TRINCHERINI, ENRICO;
2015

Abstract

Effective theories of a scalar $phi$ invariant under the internal extitgalileon symmetry $phi ophi+b_mu x^mu$ have been extensively studied due to their special theoretical and phenomenological properties. In this paper, we introduce the notion of extitweakly broken galileon invariance, which characterizes the unique class of couplings of such theories to gravity that maximally retain their defining symmetry. The curved-space remnant of the galileon's quantum properties allows to construct (quasi) de Sitter backgrounds largely insensitive to loop corrections. We exploit this fact to build novel cosmological models with interesting phenomenology, relevant for both inflation and late-time acceleration of the universe.
2015
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
modified gravity, inflation, gravity, dark energy theory
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/58955
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