The role of self-interacting right-handed neutrinos in galactic structure

Abstract

It has been shown previously that the DM in galactic halos can be explained by a self-gravitating system of massive keV fermions (`inos') in thermodynamic equilibrium, and predicted the existence of a denser quantum core of inos towards the center of galaxies. In this article we show that the inclusion of self-interactions among the inos, modeled within a relativistic mean-field-theory approach, allows the quantum core to become massive and compact enough to explain the dynamics of the S-cluster stars closest to the Milky Way's galactic center. The application of this model to other galaxies such as large elliptical harboring massive central dark objects of $\sim 10^9{M}_{\odot }$ is also investigated. We identify these interacting inos with sterile right-handed neutrinos pertaining to minimal extensions of the Standard Model, and calculate the corresponding total cross-section $\sigma$ within an electroweak-like formalism to be compared with other observationally inferred cross-section estimates. The coincidence of an ino mass range of few tens of keV derived here only from the galactic structure, with the range obtained independently from other astrophysical and cosmological constraints, points towards an important role of the right-handed neutrinos in the cosmic structure.

33 pages, 9 figures, version to appear in JCAP

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• Leptogenesis from Heavy Right-Handed Neutrinos in CPT Violating Backgrounds
• Self-interacting sterile neutrino dark matter: the heavy-mediator case
• Fermionic Dark Matter: Physics, Astrophysics, and Cosmology
• Shedding New Light on Sterile Neutrinos from XENON1T Experiment
• Testing the Galactic Centre potential with S-stars
• Boltzmann hierarchies for self-interacting warm dark matter scenarios
• Galactic Center constraints on self-interacting sterile neutrinos from fermionic dark matter ("ino") models
• Imaging fermionic dark matter cores at the center of galaxies
• Self-Interacting Dark Matter in Cosmology: accurate numerical implementation and observational constraints
• Heavy sterile neutrino in dark matter searches
• Fermionic Halos at Finite Temperature in AdS/CFT
• Thermodynamic instabilities in holographic neutron stars at finite temperature
• From oversimplified to overlooked: the case for exploring Rich Dark Sectors
• The dynamics of S-stars and G-sources orbiting a supermassive compact object made of fermionic dark matter
• Constraining D-foam via the 21-cm Line
• What does lie at the Milky Way centre? Insights from the S2 star orbit precession