Multifield ultralight dark matter

Gosenca, Mateja; Eberhardt, Andrew; Wang, Yourong; Eggemeier, Benedikt; Kendall, Emily; Zagorac, J. Luna; Easther, Richard

doi:10.1103/physrevd.107.083014

Cited by 16 publications

(4 citation statements)

References 71 publications

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“…String theorists suggest that we should anticipate an entire spectrum of such states, including ultralight ones and ones with heavier masses. So the recent simulations of situations consisting of a mixture of fuzzy+cold dark matter [466][467][468][469] or multi-field ultralight axion scenarios [470][471][472][473][474][475] are very much warranted.…”

Section: Pos(cosmicwispers)040 Pos(cosmicwispers)040mentioning

confidence: 99%

Cosmology of axion dark matter

O'Hare

2024

Proceedings of 1st General Meeting and 1st Training School of the COST Action COSMIC WSIPers — PoS(COSMICWISPers)

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I present an introduction and topical review on axions as a dark matter candidate. Emphasis is placed on issues surrounding the cosmology of axion dark matter that are relevant for presentday searches, including: early-Universe production mechanisms, predictions of the axion mass, bounds on axion properties derived from cosmological data, as well as the direct and indirect detection of relic axion populations.

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Section: Pos(cosmicwispers)040 Pos(cosmicwispers)040mentioning

confidence: 99%

Cosmology of axion dark matter

O'Hare

2024

Proceedings of 1st General Meeting and 1st Training School of the COST Action COSMIC WSIPers — PoS(COSMICWISPers)

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“…Such fluctuations can, for example, be probed by dynamical heating of stars [4,22]. Such effects; however, can also be mimicked to an extent by n = 2s + 1 scalar fields with similar masses [23]. Furthermore, initial conditions in the early universe do rely on the intrinsic nature (including spin) of the field [24][25][26][27][28][29][30][31][32][33][34], however, the intrinsic spin (as a spatial vector) is not directly accessible to Newtonian gravity relevant for dark matter in the contemporary universe when it is characteristically non-relativistic.…”

Section: Jcap05(2023)015mentioning

confidence: 99%

Photons from dark photon solitons via parametric resonance

Amin

Long

Schiappacasse

2023

J. Cosmol. Astropart. Phys.

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Wave-like dark matter made of spin-1 particles (dark photons) is expected to form ground state clumps called “vector solitons”, which can have different polarizations. In this work, we consider the interaction of dark photons with photons, expressed as dimension-6 operators, and study the electromagnetic radiation that arises from an isolated vector soliton due to parametric resonant amplification of the ambient electromagnetic field. We characterize the directional dependence and polarization of the outgoing radiation, which depends on the operator as well as the polarization state of the underlying vector soliton. We discuss the implications of this radiation for the stability of solitons and as a possible channel for detecting mergers of vector solitons through astrophysical observations.

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“…Despite these interesting motivations, in the last few years, observational constraints on single component Ultra Light Dark Matter (ULDM) have become more and more severe [3][4][5][6][7][8]. There is therefore increasing interest in opening up more parameter space in the ULDM picture by adding more light scalars to the model [9][10][11][12][13][14][15]. For example, this can suppress the heating of stars near cores, suppressing the effect mentioned in ref.…”

Section: Introductionmentioning

confidence: 99%

Core and halo properties in multi-field wave dark matter

van Dissel,

Hertzberg,

Shapiro

2024

J. Cosmol. Astropart. Phys.

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In this work, we compute multi-field core and halo properties in wave Dark Matter models. We focus on the case where Dark Matter consists of two light (real) scalars, interacting gravitationally. As in the single-field Ultra Light Dark Matter (ULDM) case, the scalar field behaves as a coherent BEC with a definite ground state (at fixed total mass), often referred to in the literature as a gravitational soliton. We establish an efficient algorithm to find the ground and excited states of such two-field systems. We then use simulations to investigate the gravitational collapse and virialization, starting from different initial conditions, into solitons and surrounding halo. As in the single-field case, a virialized halo forms with a gravitational soliton (ground state) at the center. We find some evidence for an empirical relation between the soliton mass and energy and those of the host halo. We use this to then find a numerical relation between the properties of the two. Finally, we use this to address the issue of alleviating some of the tensions that single-field ULDM has with observational data, in particular, the issue of how a galaxy's core and radius are related. We find that if galaxies of different masses have similar percentages of the two species, then the core-radius scaling tension is not addressed. However, more general possibilities occur if the relative abundance of species in each halo correlates with the total mass of the galaxy. If this is the case, the model predicts several other phenomenological signatures.

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Multifield ultralight dark matter

Cited by 16 publications

References 71 publications

Cosmology of axion dark matter

Cosmology of axion dark matter

Photons from dark photon solitons via parametric resonance

Core and halo properties in multi-field wave dark matter

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