Unified dark energy from Chiral-Quintom model with a mixed potential in Friedmann–Lemaître–Robertson–Walker cosmology

Andronikos Paliathanasis

doi:10.1140/epjc/s10052-023-11946-5

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2023) 83: 756
https://doi.org/10.1140/epjc/s10052-023-11946-5

Regular Article - Theoretical Physics

Unified dark energy from Chiral-Quintom model with a mixed potential in Friedmann–Lemaître–Robertson–Walker cosmology

Andronikos Paliathanasis¹^,2^a

¹ Institute of Systems Science, Durban University of Technology, 4000, Durban, Republic of South Africa
² Departamento de Matemáticas, Universidad Católica del Norte, Avda. Angamos 0610, 1280, Casilla, Antofagasta, Chile

^a anpaliat@phys.uoa.gr

Received: 5 June 2023
Accepted: 20 August 2023
Published online: 29 August 2023

Abstract

For a spatially Friedmann–Lemaître–Robertson–Walker cosmology, we propose a multi-scalar field gravitational model. Specifically, we consider a two-scalar field cosmological model in which the kinetic components of the scalar fields establish a two-dimensional sphere of Lorentzian signature. For our Chiral-Quintom model we choose a mixed potential term $V (ϕ, ψ) = V_{0} e^{λ ϕ} + U_{0} e^{κ ϕ} ψ^{\frac{1}{σ}}$ $V\left( \phi ,\psi \right) =V_{0}e^{\lambda \phi }+U_{0}e^{\kappa \phi }\psi ^{\frac{1}{\sigma } }$ and we investigate the asymptotic limits of the cosmological parameters. This model for $U_{0} = 0$ $U_{0}=0$ , provides a generalization of the hyperbolic inflation where the equation of the state parameter can cross the phantom divide line. When $U_{0} \neq 0$ $U_{0}\ne 0$ we observe that this cosmological model exhibits asymptotic solutions that encompass accelerated universes, big rip singularities, and dust-like solutions. Hence, this multi-scalar field model it can be regarded as as a dark energy unify model which describes a variety of asymptotic cosmological scenarios.

© The Author(s) 2023

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