Triple unification of inflation, dark energy, and dark matter in two-scalar-field cosmology

Sá, Paulo M.

doi:10.1103/physrevd.102.103519

Cited by 45 publications

(37 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The above dynamical system contains two dimensionless constants, µ and β. Without any loss of generality, we can assume µ to be non-negative, just like for the dynamical system (8). Indeed, the dynamical system is invariant under the transformation x → −x, z → −z, µ → −µ, and β → (−1) n+1 β; this implies that solutions for negative values of µ can be obtained straightforwardly from solutions for positive values of µ, provided reflections over x and z are performed (if only even values of n were considered, we could choose β to be non-negative instead of µ).…”

Section: Coupled Quintessence With a Generalized Interaction Termmentioning

confidence: 99%

See 1 more Smart Citation

Coupled quintessence with a generalized interaction term

Potting¹,

Sá²

2021

Preprint

Self Cite

View full text Add to dashboard Cite

We investigate a cosmological model in which dark energy, represented by a quintessential scalar field, is directly coupled to a dark-matter perfect fluid. For the coupling between these two dark components of the Universe, we choose forms that generalize the one most commonly used in the literature. Resorting to powerful methods of qualitative analysis of dynamical systems, we identify and analyze all solutions of cosmological relevance, that is, solutions for which a present era of accelerated expansion is preceded by a long enough dark-matter-dominated era. We show that, for certain generalized forms of the coupling, global attractors of our coupled quintessential model correspond to solutions in which the evolution of the Universe is completely dominated by dark energy. In this case, there are no critical points corresponding to scaling solutions. Interestingly, however, for certain values of a relevant parameter, during the approach to the global attractor the evolution of the cosmological parameters is so slow that, for all practical purposes, the solution appears to be stuck in a state corresponding to a scaling solution.

show abstract

Section: Coupled Quintessence With a Generalized Interaction Termmentioning

confidence: 99%

“…Such an approach was carried out, for instance, in Refs. [8,9], where dark energy and dark matter were unified within a two-scalar-field cosmological model.…”

Section: Introductionmentioning

confidence: 99%

Coupled quintessence with a generalized interaction term

Potting¹,

Sá²

2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Modified gravity bridges the gap between the early and late-time phenomenology, since a unified description can be achieved; see, for example, the pioneer article [8] and Refs. [9][10][11][12][13][14][15][16] and also Refs. [17][18][19][20][21][22] for reviews.…”

Section: Introductionmentioning

confidence: 96%

Unifying inflation with early and late dark energy epochs in axion F(R) gravity

Oikonomou

2021

Phys. Rev. D

115

View full text Add to dashboard Cite

We provide a theoretical model of FðRÞ gravity in which it is possible to describe in a unified way inflation, an early and a late dark energy era, in the presence of a light axion particle which plays the role of the dark matter component of the Universe. Particularly, the early time phenomenology is dominated by an R 2 term, while the presence of the other terms fðRÞ ensure the occurrence of the early and late-time dark energy eras. The inflationary phenomenology is compatible with the Planck 2018 data for inflation, while the late-time dark energy era is compatible with the Planck 2018 constraints on the cosmological parameters. Also, the model exhibits an early dark energy era, at z ∼ 2.5 approximately, followed by a deceleration era, which starts at approximately z ∼ 1.5, which in turn is followed by a late-time dark energy era for redshifts z ∼ 0.5, which lasts for approximately 5 billion years up to present time. A notable feature of our model is that the dark energy era is free from dark energy oscillations, at least in the redshift interval z ¼ ½0; 10. In addition, we also discuss several features related to observational data at z ∼ 2.34, at which redshift intricate observational data exist in the literature. Moreover, the numerical code for the dark energy phenomenology, written in PYTHON3, is presented in the end of the article. Finally, the model has another interesting characteristic, a sudden jump of the value of the Hubble rate in the redshift interval z ∼ ½2; 2.6 where its value suddenly increases and then decreases until z ∼ 0.

show abstract

“…Besides the above category of models, schemes that attempt to unify dark matter and inflation have been reported [25,26]. In addition, attempts have been made to unify all three of inflation, dark matter and dark energy in [27][28][29][30][31]. It is interesting and attractive idea to unify inflation, dark matter and dark energy in a single theoretical picture.…”

Section: Introductionmentioning

confidence: 99%

Two models unifying warm inflation with dark matter and dark energy

Zhang,

Li,

Guo

et al. 2021

Preprint

View full text Add to dashboard Cite

Two models that unify warm inflation with dark matter and dark energy are proposed. In the models, a single scalar field is responsible for the early expansion of the universe through the process of dissipative warm inflation and then acts as both dark matter and dark energy in subsequent stages. The first model is based on a noncanonical field with the Lagrangian density L = F(X) − V(φ), where the potential is dominant at the slowroll inflationary epoch and negligible in subsequent stages. The second model takes advantage of a k-essence Lagrangian density having the coupled form L = F(X)V(φ). For both models, equations of the evolution for the fields and observational constraints are presented, and an evolution law describing how the energy density ρ and state parameter w scale with the scale factor a is obtained.

show abstract

Triple unification of inflation, dark energy, and dark matter in two-scalar-field cosmology

Cited by 45 publications

References 40 publications

Coupled quintessence with a generalized interaction term

Coupled quintessence with a generalized interaction term

Unifying inflation with early and late dark energy epochs in axion F(R) gravity

Two models unifying warm inflation with dark matter and dark energy

Contact Info

Product

Resources

About