Cosmic structures via Bose–Einstein condensation and its collapse

Fukuyama, Takeshi; Morikawa, Masahiro; Tatekawa, Takayuki

doi:10.1088/1475-7516/2008/06/033

Cited by 91 publications

(100 citation statements)

References 16 publications

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“…This has lead some to general consideration of Bose-Einstein-Condensate (BEC) dark matter (see, for example, [47][48][49], and in the case of axions [50,51]). Indeed, the numerical simulation of [52] showed that the presence of such an ultra-light scalar condensate indeed reduces the number of dwarf galaxies, but in fact does very little to the cuspy density profile.…”

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confidence: 99%

Ultralight axions: Degeneracies with massive neutrinos and forecasts for future cosmological observations

et al. 2012

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A generic prediction of string theory is the existence of many axion fields. It has recently been argued that many of these fields should be light and, like the well known QCD axion, lead to observable cosmological consequences. In this paper we study in detail the effect of the so-called string axiverse on large scale structure, focusing on the morphology and evolution of density perturbations, anisotropies in the cosmic microwave background and weak gravitational lensing of distant galaxies. We quantify specific effects that will arise from the presence of the axionic fields and highlight possible degeneracies that may arise in the presence of massive neutrinos. We take particular care understanding the different physical effects and scales that come into play. We then forecast how the string axiverse may be constrained and show that with a combination of different observations, it should be possible to detect a fraction of ultralight axions to dark matter of a few percent.

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confidence: 99%

Ultralight axions: Degeneracies with massive neutrinos and forecasts for future cosmological observations

et al. 2012

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“…Imposing this thermodynamic condition on Eqs. (18) and (30) helps us to fix the transition density ρ cr χ as follows:…”

Section: Cosmological Parameters At the Condensation Pointmentioning

confidence: 99%

“…Based on the above arguments, we assume the possibility that the Bose-Einstein condensation might have happened during the early stages of cosmological evolution of the universe with a temperature comparable to the critical temperature for Bose-Einstein condensation T cr ∼ 2πh 2 n 2/3 /mk B where m is the particle mass, n is the particle density, and k B is Boltzmann's constant [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Dark matter as the Bose–Einstein condensation in loop quantum cosmology

Atazadeh¹,

Darabi²,

Mousavi³

2016

Eur. Phys. J. C

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We consider the FLRW universe in a loop quantum cosmological model filled with radiation, baryonic matter (with negligible pressure), dark energy, and dark matter. The dark matter sector is supposed to be of Bose-Einstein condensate type. The Bose-Einstein condensation process in a cosmological context by supposing it as an approximate first-order phase transition, has already been studied in the literature. Here, we study the evolution of the physical quantities related to the early universe description such as the energy density, temperature, and scale factor of the universe, before, during, and after the condensation process. We also consider in detail the evolution era of the universe in a mixed normal-condensate dark matter phase. The behavior and time evolution of the condensate dark matter fraction is also analyzed.

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“…The equilibrium properties of Newtonian self-gravitating Bose-Einstein condensates with short-range interactions were investigated in detail in [35,36]. The study of the cosmological implications of the Bose-Einstein condensation has also become an active field of research [37][38][39][40][41][42][43][44][45][46]. In particular, in [44] it was shown that condensate dark matter effects can be seen in the CMB matter power spectrum if the mass m χ of the condensate particle lies in the range 15 meV < m χ < 700 meV, leading to a small, but perceptible, excess of power at large scales.…”

Section: Introductionmentioning

confidence: 99%

Gravitational, lensing, and stability properties of Bose-Einstein condensate dark matter halos

Harkó

2015

Phys. Rev. D

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The possibility that dark matter, whose existence is inferred from the study of the galactic rotation curves, and from the mass deficit in galaxy clusters, can be in a form of a Bose-Einstein Condensate, has been extensively investigated lately. In the present work, we consider a detailed analysis of the astrophysical properties of the Bose-Einstein Condensate dark matter halos that could provide clear observational signatures that help discriminate between different dark matter models. In the BoseEinstein condensation model dark matter can be described as a non-relativistic, gravitationally confined Newtonian gas, whose density and pressure are related by a polytropic equation of state with index n = 1. The mass and gravitational properties of the condensate halos are obtained in a systematic form, including the mean logarithmic slopes of the density and of the tangential velocity. The lensing properties of the condensate dark matter are investigated in detail. In particular, a general analytical formula for the surface density, an important quantity that defines the lensing properties of a dark matter halos, is obtained in the form of series expansions. This enables arbitraryprecision calculations of the surface mass density, deflection angle, deflection potential, and of the magnification factor, thus giving the possibility of the comparison of the predicted lensing properties of the condensate dark matter halos with observations. The stability properties of the condensate halos are also investigated by using the scalar and the tensor virial theorems, respectively, and the virial perturbation equation for condensate dark matter halos is derived. As an application of the scalar virial theorem we consider the problem of the stability of a slowly rotating and slightly disturbed galactic dark matter halo. For such a halo the oscillations frequencies and the stability conditions are obtained in the linear approximation.

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Cosmic structures via Bose–Einstein condensation and its collapse

Cited by 91 publications

References 16 publications

Ultralight axions: Degeneracies with massive neutrinos and forecasts for future cosmological observations

Ultralight axions: Degeneracies with massive neutrinos and forecasts for future cosmological observations

Dark matter as the Bose–Einstein condensation in loop quantum cosmology

Gravitational, lensing, and stability properties of Bose-Einstein condensate dark matter halos

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