Coherent degenerate dark matter: a galactic superfluid?
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Silverman, Mark P.; Mallett, Ronald L.

doi:10.1088/0264-9381/18/17/101

Cited by 35 publications

(31 citation statements)

References 13 publications

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“…Similar ideas were independently investigated by many authors [23,[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][40][41][42][43][44][45]. For example, a model with m = 0 was suggested in [27], which has a stability issue.…”

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confidence: 68%

“…Guzman and Matos et al [46,47] extensively studied various astrophysical aspects of the SFDM. Other attempts are based, for example, on a non-minimal coupling [28], quintessence [29,48], Repulsive DM [30], fluid DM [32], nontopological soliton [33], cosh potential [35,36], and ULA [34,37,38] among many [39][40][41][42][43][44]49]. The BEC nature of this DM was extensively studied in [9,23,50] by Harko, Chavanis and their colleagues.…”

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confidence: 99%

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Brief History of Ultra-light Scalar Dark Matter Models

Lee

2018

EPJ Web Conf.

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Abstract. This is a review on the brief history of the scalar field dark matter model also known as fuzzy dark matter, BEC dark matter, wave dark matter, or ultra-light axion. In this model ultra-light scalar dark matter particles with mass m = O(10 −22 )eV condense in a single Bose-Einstein condensate state and behave collectively like a classical wave. Galactic dark matter halos can be described as a self-gravitating coherent scalar field configuration called boson stars. At the scale larger than galaxies the dark matter acts like cold dark matter, while below the scale quantum pressure from the uncertainty principle suppresses the smaller structure formation so that it can resolve the small scale crisis of the conventional cold dark matter model.Despite long efforts dark matter (DM) remains a great mystery in physics and astronomy [1]. While numerical results of the cold dark matter (CDM) model are remarkably successful in explaining the large scale structure of the universe, it encounters some problems at the scale of galactic or sub-galactic structures. For example, the numerical simulations usually predict cusped central halo density and too many sub-halos and small galaxies, which seem to be in contradiction with observations [2][3][4][5].Recently, there is a growing interest in the idea that DM particles are ultra-light scalars in Bose-Einstein condensate (BEC). (For a review, see Refs. 6-13) In this model, due to the tiny DM particle mass m = O(10 −22 )eV, the DM particle number density is very high and hence the inter-particle distance is much smaller than the de Broglie wave length of the DM particles. Therefore, the particles are in BEC and move collectively as a wave rather than incoherent particles. At the scale larger than galaxies the DM perturbation behaves like that of CDM, while below the scale quantum pressure from the uncertainty principle suppresses the small structure formation, which makes it a viable alternative to CDM. This property helps us to resolve the small scale problems of the CDM model such as the missing satellite problem or the cusp/core problem [14].Before 2000 there were only a few groups of scientists working on this topic, without much communication even between them. Being unaware of precedent works, many researchers in this field independently proposed similar ideas with various names such as BEC DM, scalar field DM (SFDM), fuzzy DM, ultra-light axion (ULA), ultralight axion like particle (ALP), wave DM, ψ DM, repulsive DM or (super)fluid DM among many, although the basic physics of these models is quite similar. (Henceforth, I will use the term 'SFDM' for the model.) This unfortunate ⋆ e-mail: scikid@jwu.ac.kr situation has brought some confusions among researchers in this field. Therefore, at this point, it is desirable to summarize what have already attempted in this exciting field. 1The hypothesis that galactic DMs are ultra-light scalar particles in BEC has a long history. In Ref.[15] Baldeschi et al. considered the galactic halo model of self-gravitating bosons wit...

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confidence: 99%

Brief History of Ultra-light Scalar Dark Matter Models

Lee

2018

EPJ Web Conf.

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“…Similar models are regarded earlier [29] for a Bose-Einstein condensate whose properties intimately related to the superfluidity and superconductivity. In particular it is found that the coherence length of the cosmic Bose-Einstein condensate is equal to the Jeans wavelength.…”

Section: Robertson-walker Metricsmentioning

confidence: 85%

“…The second term in (29) is found using the explicit expression for g i j and decomposition (17). Then the balance Eq.…”

Section: Balance Equations Of Phonon Gasmentioning

confidence: 99%

Relativistic kinetics of phonon gas in superfluids

Popov

2006

Gen Relativ Gravit

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The relativistic kinetic theory of the phonon gas in superfluids is developed. The technique of the derivation of macroscopic balance equations from microscopic equations of motion for individual particles is applied to an ensemble of quasi-particles. The necessary expressions are constructed in terms of a Hamilton function of a (quasi-)particle. A phonon contribution into superfluid dynamic parameters is obtained from energy-momentum balance equations for the phonon gas together with the conservation law for superfluids as a whole. Relations between dynamic flows being in agreement with results of relativistic hydrodynamic consideration are found. Based on the kinetic approach a problem of relativistic variation of the speed of sound under phonon influence at low temperature is solved.

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“…We approach a state described by the Bose-Einstein statistics and likely present in the regions of the Universe shielded from the temperature of microwave background radiation of the Big Bang, which currently is 2.725 K. Such shielded states exist at the edge of the black holes or gravastars (Mazur and Mottola, 2004). Gravastars are quark stars representing a gravitational version of Bose-Einstein condensate, which is all composed of an identical wave function (Silverman and Mallett, 2001). It consists of particles created in pairs out of the vacuum near the edge of the black hole being the place where the four fundamental forces come together (Garay, 2002).…”

Section: Coherent States and Computationmentioning

confidence: 99%

Physical limits of computation and emergence of life

Igamberdiev

2007

Biosystems

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Coherent degenerate dark matter: a galactic superfluid? ¹

Cited by 35 publications

References 13 publications

Brief History of Ultra-light Scalar Dark Matter Models

Brief History of Ultra-light Scalar Dark Matter Models

Relativistic kinetics of phonon gas in superfluids

Physical limits of computation and emergence of life

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Coherent degenerate dark matter: a galactic superfluid? 1

Cited by 35 publications

References 13 publications

Brief History of Ultra-light Scalar Dark Matter Models

Brief History of Ultra-light Scalar Dark Matter Models

Relativistic kinetics of phonon gas in superfluids

Physical limits of computation and emergence of life

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Product

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Coherent degenerate dark matter: a galactic superfluid? ¹