Cosmological constraints on the Multi Scalar Field Dark Matter model

Téllez-Tovar, L. O.; Matos, Tonatiuh; Vázquez, J. Alberto

doi:10.48550/arxiv.2112.09337

Cited by 2 publications

(2 citation statements)

References 51 publications

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“…On the other hand, the multi-field cosmology paradigm has proven to be an effective framework to account (in a single model) for several important characteristics/ingredients of the universe, e.g., early acceleration (inflation) [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25], dark matter [26][27][28], late acceleration [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. With respect to early and late acceleration, the crossing of the phantom divide line is a most wanted feature in scalar field cosmology; it has been shown that this crossing cannot be achieved by considering a single scalar field/fluid (unless stability is not demanded) [44].…”

Section: Introductionmentioning

confidence: 99%

Quintom fields from chiral anisotropic cosmology

Socorro¹,

Pérez-Payán²,

Hernández-Jiménez³

et al. 2022

Preprint

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In this paper we present an analysis of a chiral anisotropic cosmological scenario from the perspective of quintom fields. In this setup quintessence and phantom fields interact in a non-standard (chiral) way within an anisotropic Bianchi type I background. We present our examination from two fronts: classical and quantum approaches. In the classical program we find analytical solutions given by a particular choice of the emerged relevant parameters. Remarkably, we present an explanation of the "big-bang" singularity by means of a "big-bounce". Moreover, isotropization is in fact reached as the time evolves. On the quantum counterpart the Wheeler-DeWitt equation is analytically solved for various instances given by the same parameter space from the classical study, and we also include the factor ordering Q. Having solutions in this scheme we compute the probability density, which is in effect damped as the volume function and the scalar fields evolve; and it also tends towards a flat FLRW framework when the factor ordering constant Q 0. This result might indicate that for a fixed set of parameters, the anisotropies quantum-mechanically vanish for very small values of the parameter Q. Finally, classical and quantum solutions reduce to their flat FLRW counterparts when the anisotropies vanish.

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Section: Introductionmentioning

confidence: 99%

Quintom fields from chiral anisotropic cosmology

Socorro¹,

Pérez-Payán²,

Hernández-Jiménez³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Thus, the assumptions proposed give rise to many implications, and we would like to dwell on a few. It is worth to note that dark matter, made of several constituents, is already being actively studied [37,38].…”

Section: Introductionmentioning

confidence: 99%

Bose–Einstein Condensate Dark Matter That Involves Composites

Gavrilik

Nazarenko

2022

Universe

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Improving the Bose–Einstein condensate model of dark matter through the repulsive three-particle interaction to better reproduce observables such as rotation curves reveals both different thermodynamic phases and few-particle correlations. Using the numerically found solutions of the Gross–Pitaevskii equation for averaging the products of local densities and for calculating thermodynamic functions at zero temperature, it is shown that the few-particle correlations imply a first-order phase transition and are reduced to the product of single-particle averages with a simultaneous increase in pressure, density, and quantum fluctuations. Under given conditions, dark matter exhibits the properties of an ideal gas with an effective temperature determined by quantum fluctuations. Characteristics of oscillations between bound and unbound states of three particles are estimated within a simple random walk approach to qualitatively model the instability of particle complexes. On the other hand, the density-dependent conditions for the formation of composites are analyzed using chemical kinetics without specifying the bonds formed. The obtained results can be extended to the models of multicomponent dark matter consisting of composites formed by particles with a large scattering length.

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Cosmological constraints on the Multi Scalar Field Dark Matter model

Cited by 2 publications

References 51 publications

Quintom fields from chiral anisotropic cosmology

Quintom fields from chiral anisotropic cosmology

Bose–Einstein Condensate Dark Matter That Involves Composites

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