First and second order cosmological perturbations in light mass Galileon models

Abstract

In this paper, we investigate the first and second order cosmological perturbations in the light mass Galileon (LMG) scenario. LMG action includes cubic Galileon term along with the standard kinetic term and a potential which is added phenomenologically to achieve late time acceleration. The scalar field is nonminimally coupled to matter in the Einstein frame. Integral solutions of growing and decaying modes are obtained. The effect of the conformal coupling constant ($\beta$), at the perturbation level, has been studied. In this regard, we have studied linear power spectrum and bispectrum. Though different values of $\beta$ has different effects on power spectrum on reduced bispectrum the effect is not significant. It has been found that the redshift-space distortions (RSD) data can be very useful to constrain $\beta$. In this study we consider potentials which can lead to tracker behavior of the scalar field.

16 pages, 9 figures, 1 table, minor modification in the title, refs updated, published in PRD

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Cited by in corpus (9)

• Dark energy beyond quintessence: Constraints from the swampland
• Observed galaxy power spectrum in cubic Galileon model
• Weak lensing probe of cubic Galileon model
• Quintessential early dark energy
• A study on Cubic Galileon Gravity Using N-body Simulations
• Cosmological implications of tracker scalar fields: Testing the evidence for dynamical dark energy with recent data
• 21 cm power spectrum in interacting cubic Galileon model
• Consistency of Cubic Galileon Cosmology: Model-Independent Bounds from Background Expansion and Perturbative Analyses
• Evolution of Dark Energy Perturbations for Slotheon Field and Power Spectrum