Core and halo properties in multi-field wave dark matter
van Dissel, Fabio (Institut de Física d'Altes Energies)
Hertzberg, Mark P. (Massachusetts Institute of Technology. Department of Physics)
Shapiro, Jared (Tufts University. Department of Physics and Astronomy.)

Data:	2024
Resum:	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.
Ajuts:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00649 Ministerio de Ciencia e Innovación PRE2020-094420
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Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Journal of Cosmology and Astroparticle Physics, Vol. 2024, Num. 4 (April 2024) , art. 077, ISSN 1475-7516

DOI: 10.1088/1475-7516/2024/04/077

Postprint 38 p, 3.0 MB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Institut de Física d’Altes Energies (IFAE)
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