On the mass of ultra-light bosonic dark matter from galactic dynamics
- Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12-14, 69120 Heidelberg (Germany)
- Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, AP 70-264, 04510 Mexico City (Mexico)
- Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, AP 70-543, 04510 Mexico City (Mexico)
We consider the hypothesis that galactic dark matter is composed of ultra-light scalar particles and use internal properties of dwarf spheroidal galaxies to establish a preferred range for the mass m{sub φ} of these bosonic particles. We re-investigate the problem of the longevity of the cold clump in Ursa Minor and the problem of the rapid orbital decay of the globular clusters in Fornax and dwarf ellipticals. Treating the scalar field halo as a rigid background gravitational potential and using N-body simulations, we have explored how the dissolution timescale of the cold clump in Ursa Minor depends on m{sub φ}. It is demonstrated that for masses in the range 0.3 × 10{sup −22} eV < m{sub φ} < 1 × 10{sup −22} eV, scalar field dark halos without self-interaction would have cores large enough to explain the longevity of the cold clump in Ursa Minor and the wide distribution of globular clusters in Fornax, but small enough to make the mass of the dark halos compatible with dynamical limits. It is encouraging to see that this interval of m{sub φ} is consistent with that needed to suppress the overproduction of substructure in galactic halos and is compatible with the acoustic peaks of cosmic microwave radiation. On the other hand, for self-interacting scalar fields with coupling constant λ, values of m{sub φ}{sup 4}/λ∼<0.55 × 10{sup 3} eV{sup 4} are required to account for the properties of the dark halos of these dwarf spheroidal galaxies.
- OSTI ID:
- 22280202
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2012, Issue 02; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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