Global asymptotic dynamics of the cubic galileon interacting with dark matter
arXiv:2206.14333 · doi:10.1016/j.dark.2023.101183
Abstract
In this paper we perform a thorough dynamical systems analysis of the cubic galileon model non-minimally coupled to the dark matter. Three well-known classes of interacting models are considered where the energy exchange between the dark components is a function of the dark matter density and of the dark energy density: , and , respectively. We are able to show the global asymptotic dynamics of the model for the exponential potential in a homogeneous and isotropic background. The cosmological implications of the proposed scenarios are explored and it is found that, in addition to the appearance of new equilibrium configurations that do not appear neither in the non-interacting cubic galileon model nor in the interacting quintessence model, there is a significant impact of the non-minimal coupling through modification of the stability properties of the critical points. The resulting cosmological scenario provides a bigbang origin of the cosmic expansion, an early transient stage of inflationary expansion, as well as matter-scaling late time stable state of the universe, among other solutions of lesser cosmological interest. This work extends previous studies of coupled dark energy to a broader class of gravitational theories.
22 pages, 6 figures. Version that matches the one published
References in corpus (16)
- Dynamics of dark energy
- Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
- Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
- Covariant Galileon
- Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
- Imperfect Dark Energy from Kinetic Gravity Braiding
- Indications of a late-time interaction in the dark sector
- Le Chatelier-Braun principle in cosmological physics
- Dark Interactions and Cosmological Fine-Tuning
- Dark sector interaction: a remedy of the tensions between CMB and LSS data
- Dynamical analysis of generalized Galileon cosmology
- Selected topics in scalar-tensor theories and beyond
- 2021- Odyssey: Closed, Phantom and Interacting Dark Energy Cosmologies
- Time-dependent spherically symmetric covariant Galileons
- Constraints on interacting dark energy models from time-delay cosmography with seven lensed quasars
- Non-local dilaton coupling to dark matter: cosmic acceleration and pressure backreaction