Abstract
We revisit the cosmological dynamics of the cubic Galileon model in light of the recently proposed model-independent analyses of the Pantheon supernova data. At the background level, it is shown to be compatible with data and preferred over standard quintessence models. Furthermore, the model is shown to be consistent with the trans-Planckian censorship conjecture (as well as other Swampland conjectures). It is shown that for the given parametrization, the model fails to satisfy the bounds on the reconstructed growth index derived from the Pantheon data set at the level of linear perturbations.
Highlights
The ΛCDM flat concordance model, based on General Relativity and the assumption of the Cosmological Principle, has been extremely successful in describing an abundance of cosmological data despite its remarkable simplicity [1]
Recently there have been hints coming in from String Theory that a pure de-Sitter solution, as would be the case for the ΛCDM paradigm in the asymptotic future, is not compatible with a ultraviolet (UV) complete theory of gravity [12]. This is a rather remarkable development since it implies that the nature of quantum gravity can leave its imprint on the very late time dynamics of the universe, albeit indirectly through the theoretical consistency of the low energy effective field theory (EFT) being employed
We present some theoretical motivations to look beyond the standard ΛCDM paradigm and look at alternative models of dark energy
Summary
The ΛCDM flat concordance model, based on General Relativity and the assumption of the Cosmological Principle, has been extremely successful in describing an abundance of cosmological data despite its remarkable simplicity [1] In this model, the late-time acceleration of the universe is explained by the presence of a cosmological constant term [2]. Recently there have been hints coming in from String Theory that a pure de-Sitter (dS) solution, as would be the case for the ΛCDM paradigm in the asymptotic future, is not compatible with a ultraviolet (UV) complete theory of gravity [12] This is a rather remarkable development since it implies that the nature of quantum gravity can leave its imprint on the very late time dynamics of the universe, albeit indirectly through the theoretical consistency of the low energy effective field theory (EFT) being employed.
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