Small-Scale Cosmology “Crisis” and Self-Interacting Right-Handed Neutrino Warm Dark Matter

Small-Scale Cosmology “Crisis” and Self-Interacting Right-Handed Neutrino Warm Dark Matter

In the lecture, I first review the basic problems of the ΔCDM model at small (galactic) scales, also known as “small-scale Cosmology crisis”, namely discrepancies between theoretical simulations and observations. I then argue how systems of righthanded neutrinos (RHN) with masses of order 50 keV in...

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Bibliographic Details
Main Author: Mavromatos, Nick E.
Format: Conference Proceeding
Language:eng
Subjects:
Astronomical models
Computer simulation
Cosmology
Dark matter
Galaxies
Neutrinos
Phenomenology
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Summary:In the lecture, I first review the basic problems of the ΔCDM model at small (galactic) scales, also known as “small-scale Cosmology crisis”, namely discrepancies between theoretical simulations and observations. I then argue how systems of righthanded neutrinos (RHN) with masses of order 50 keV in the galaxies can tackle these problems, provided appropriately strong RHN self-interactions are included. Such models may constitute interesting minimal extensions of the Standard Model. Combining galactic phenomenology with other astroparticle physics considerations of such models, one arrives at a narrow range 47 keVc -2 ≤ m ≤ 50 keVc -2 for the allowed mass m of RHN, thereby pointing towards the rôle of such particles as interesteding warm dark matter components.
ISSN:2100-014X
2101-6275
2100-014X