19-21 September 2023
Europe/Berlin timezone

Confronting Dark Matter with Dirac Neutrinos

21 Sep 2023, 11:50
Nachrichtentechnik-Hörsaal (NTI) (KIT)

Nachrichtentechnik-Hörsaal (NTI)


Engesserstraße 5, 76131 Karlsruhe


Dr. Dibyendu Nanda (Korea Institute for Advanced Study)


The identity of neutrinos, Dirac or Majorara, is an essential yet unsolved puzzle of nature. By assuming that neutrinos are Dirac particles, we propose a light Dirac neutrino portal dark matter scenario which is based on the possible correlation between the relic right-handed neutrinos and present dark matter abundance. We studied the connection between dark matter and the light right-handed neutrinos produced both thermally and non-thermally and showed that the observables like $\Delta{N_{\rm eff}}$ and free-streaming length of dark matter can put tight constraints on the available parameter space. For example, in the case of non-thermal dark matter, such constraints can rule out DM mass all the way up to $\mathcal{O}$(100 keV). This can be a possible way to probe the dark matter parameter space even when the direct detection cross-section is suppressed or forbidden in the theory.

Primary author

Dr. Dibyendu Nanda (Korea Institute for Advanced Study)

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