PPC 2023: XVI International Conference on Interactions between Particle Physics and Cosmology

Confronting Dark Matter with Dirac Neutrinos

13 Jun 2023, 17:50

20m

Auditorium (IBS Science and Culture Center)

Dark Matter Physics Parallel: Dark Matter 4

Speaker

Dibyendu Nanda (Korea Institute for Advanced Study)

Description

We propose a Dirac neutrino portal dark matter scenario by minimally extending the particle content of the Standard Model (SM) with three right-handed neutrinos, a Dirac fermion dark matter candidate, and a complex scalar, all of which are singlets under the SM gauge group. symmetry $Z_4$ has been introduced for the stability of dark matter candidates and also to ensure the Dirac nature of light neutrinos at the same time. We studied both thermal and non-thermal dark matter scenarios and the possibility of probing such scenarios through the contribution to the effective relativistic degrees of freedom $\mathrm{\Delta }{N}_{\mathrm{e}\mathrm{f}\mathrm{f}}$. We also check the stringent constraints on the free-streaming length of such freeze-in DM from structure formation requirements. Such constraints can rule out DM mass all the way up to $\mathcal{O}$(100 keV).

Presentation materials

PPC23_Dnanda.pdf