Cosmology of a Covariant Galileon Field

By Antonio de Felice, S. Tsujikawa. 2010

283 citations recorded by the source corpus.

We study the cosmology of a covariant scalar field respecting a Galilean symmetry in flat space-time. We show the existence of a tracker solution that finally approaches a de Sitter fixed point responsible for cosmic acceleration today. The viable region of model parameters is clarified by deriving conditions under which ghosts and Laplacian instabilities of scalar and tensor perturbations are absent. The field equation of state exhibits a peculiar phantomlike behavior along the tracker, which allows a possibility to observationally distinguish the Galileon gravity from the cold dark matter model with a cosmological constant.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/d47d2b4760122112828cc530582fc9eb27b59c3d

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Citations in the corpus

f(T,𝒯) gravity and cosmology (2014, methodology): “This is usual in complicated modified gravity models, for instance in generalized Galileon theory [73, 103], in Hořava-Lifshitz gravity [104, 105], in cosmology with non-minimal derivative coupling [106], etc.”
Maximal freedom at minimum cost: linear large-scale structure in general modifications of gravity (2014, unknown): “These provide natural scaling solutions and post-inflationary conditions for the models [47, 77].”
Testing modified gravity at cosmological distances with LISA standard sirens (2019, background): “18), which corresponds to the case of beyond Horndeski theories [83], one recovers a unique value for ξ throughout the evolution of the universe [93]7.”
Galileon gravity in light of ISW, CMB, BAO and H0 data (2017, background): “f [22]). The results are insensitive to the exact time this tracker evolution starts to be followed, provided that the tracker is reached before this critical time. This evolution is characterized by [13] ˚H_ M PlH 0 2 ˘= constant; (3.6) where ˘is a constant free dimensionless parameter. Below, we a”
Cosmology in generalized Proca theories (2016, result): “While even p-form Galileons and multi odd p-form Galileons are easy to construct, very soon it was realized that one cannot construct Galilean interactions for a Lorentz- and gauge-invariant, single spin-1 (i.e., 1-form) field in any dimensions [26] (see also Refs.”
Modified Gravity and Cosmology (2011, background): “In [373] conditions are derived that guarantee the”
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].”