Late-time evolution of the Universe within a two-scalar-field cosmological model

Abstract

We investigate the late-time evolution of the Universe within a cosmological model in which dark matter and dark energy are identified with two interacting scalar fields. Using methods of qualitative analysis of dynamical systems, we identify all cosmological solutions of this model. We show that viable solutions -- in the sense that they correspond to a cosmic evolution in which a long enough matter-dominated era is followed by a current era of accelerated expansion -- can be found in several regions of the parameter space. These solutions can be divided into two categories, namely, solutions that evolve to a state of everlasting accelerated expansion, in which the energy density of the dark-matter field rapidly approaches zero and the evolution becomes entirely dominated by the dark-energy field, and solutions in which the stage of accelerated expansion is temporary and the ratio between the energy densities of dark energy and dark matter tends, asymptotically, to a constant nonzero value.

15 pages, 4 figures

References in corpus (15)

• Dynamics of dark energy
• Cosmology and the Fate of Dilatation Symmetry
• Dynamics of dark energy with a coupling to dark matter
• Coupled and Extended Quintessence: theoretical differences and structure formation
• Unifying of Inflation with Early and Late Dark Energy Epochs in Axion $F(R)$ Gravity
• Unification of Inflation with Dark Energy in $f(R)$ Gravity and Axion Dark Matter
• A k-essence Model Of Inflation, Dark Matter and Dark Energy
• Mass functions in coupled Dark Energy models
• New interactions in the dark sector mediated by dark energy
• Generalizing a Unified Model of Dark Matter, Dark Energy, and Inflation with Non Canonical Kinetic Term
• Triple unification of inflation, dark matter, and dark energy using a single field
• Unified early and late Universe cosmology through dissipative effects in steep quintessential inflation potential models
• Two-scalar-field model for the interaction of dark energy and dark matter
• Unification of inflation, dark energy, and dark matter within the Salam-Sezgin cosmological model
• Coupled quintessence with double exponential potentials

Cited by in corpus (15)

• On the dynamics of a dark sector coupling
• IWDM: The fate of an interacting non-cold dark matter $-$ vacuum scenario
• Scalar field dark matter and dark energy: a hybrid model for the dark sector
• Weak-field regime of the generalized hybrid metric-Palatini gravity
• Coupled quintessence with a generalized interaction term
• Interacting phantom dark energy: new accelerating scaling attractors
• I. Linear Interacting Dark Energy: Analytical Solutions and Theoretical Pathologies
• Dark Matter and Dark Energy from a Kaluza-Klein inspired Brans-Dicke Gravity with Barotropic Fluid
• Coupled quintessence inspired by warm inflation
• Theories of gravity with nonminimal matter-curvature coupling and the de Sitter swampland conjectures
• Gravitational waves from two scalar fields unifying the dark sector with inflation
• Cosmological viability of a double field unified model from warm inflation
• Black hole ringdown spectroscopy of curvature-coupled scalar and pseudoscalar fields
• Phantom cosmology with arbitrary potential: New accelerating scaling attractors
• Gravitational waves from warm inflation in the weak dissipative regime