Galileon gravity and its relevance to late time cosmic acceleration

By R. Gannouji, M. Sami. 2010

147 citations recorded by the source corpus.

We consider the covariant Galileon gravity taking into account the third order and fourth order scalar field Lagrangians L{sub 3}({pi}) and L{sub 4}({pi}), consisting of three and four {pi}'s with four and five derivatives acting on them, respectively. The background dynamical equations are set up for the system under consideration and the stability of the self-accelerating solution is demonstrated in a general setting. We extended this study to the general case of the fifth order theory. For the spherically symmetric static background, we spell out conditions for the suppression of fifth force effects mediated by the Galileon field {pi}. We study field perturbations in the fixed background and investigate the conditions for their causal propagation. We also briefly discuss metric fluctuations and derive an evolution equation for matter perturbations in Galileon gravity.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/cce050f1b05029ae00241e5251923e908b2c39dc

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Citations in the corpus

Modified Gravity and Cosmology (2011, background): “The late time cosmology of the covariant galileon has been studied for up to cubic [299, 911], quartic [520, 23], and quintic scalar interactions [373, 956, 369].”
The imperfect fluid behind kinetic gravity braiding (2011, background): “Nonetheless, these theories have been named galileon theories and a significant body of work has already been carried out analysing their impact not only on cosmological solutions [28–45], but also in other circumstances [46–55].”
A systematic approach to generalisations of General Relativity and their cosmological implications (2018, background): “The direct cosmological application of covariant Galileons witnessed a flurry of investigations concerning self-accelerating de Sitter solutions [223, 224], inflation [225, 226, 227, 228], dark energy and its observational implications [229, 222, 230, 231, 232, 51, 52].”
Cosmological tests of modified gravity (2015, background): “[99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 97, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121] for an incomplete list of studies of cosmology in this class of models.”