Galactic Center constraints on self-interacting sterile neutrinos from fermionic dark matter ("ino") models

Abstract

The neutrino minimal standard model ($\nu$MSM) has been tightly constrained in the recent years, either from dark matter (DM) production or from X-ray and small-scale observations. However, current bounds on sterile neutrino DM can be significantly modified when considering a $\nu$MSM extension, in which the DM candidates interact via a massive (axial) vector field. In particular, standard production mechanisms in the early Universe can be affected through the decay of such a massive mediator. We perform an indirect detection analysis to study how the $\nu$MSM parameter-space constraints are affected by said interactions. We compute the X-ray fluxes considering a DM profile that self-consistently accounts for the particle physics model by using an updated version of the Ruffini-Argüelles-Rueda (RAR) fermionic ("ino") model, instead of phenomenological profiles such as the Navarro-Frenk-White (NFW) distribution. We show that the RAR profile accounting for interacting DM, is compatible with measurements of the Galaxy rotation curve and constraints on the DM self-interacting cross section from the Bullet cluster. A new analysis of the X-ray NuSTAR data in the central parsec of the Milky Way, is here performed to derive constraints on the self-interacting sterile neutrino parameter-space. Such constraints are stronger than those obtained with commonly used DM profiles, due to the dense DM core characteristic of the RAR profiles.

24 pages, 10 figures, 2 tables, published in in Physics of the Dark Universe. arXiv admin note: substantial text overlap with arXiv:1810.05756

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• Self-Interacting Dark Matter in Cosmology: accurate numerical implementation and observational constraints
• From oversimplified to overlooked: the case for exploring Rich Dark Sectors
• Fermionic Dark Matter spikes: origin and growth of Black Hole seeds
• What does lie at the Milky Way centre? Insights from the S2 star orbit precession