Conveners
Neutrinos 2
- Anil Thapa
A minimal extension of the Standard Model (SM) by a vector-like fermion doublet and three right handed (RH) singlet neutrinos is proposed in order to explain dark matter and tiny neutrino mass simultaneously. The DM arises as a mixture of the neutral component of the fermion doublet and one of the RH neutrinos, both assumed to be odd under an imposed $\mathcal{Z}_2$ symmetry. Being Majorana in...
In this article, I have re-investigated the CP invariants relevant at low energy, for all the seven viable ansatze of texture two zero neutrino mass matrix viz. \textbf{A1, A2, B1, B2, B3, B4 }and \textbf{C}, in the flavour basis. It is found that CP invariance for ansatze \textbf{A1, A2, B3, B4} suffices for model to be CP invariant, and in addition, the CP properties, which is defined...
We consider heavy sterile neutrinos $\nu_s$ with mass in the range $10~\mathrm{MeV}≤m_s≤m_π∼135~\mathrm{MeV}$, which are thermally produced in the Early Universe, in collisional processes involving active neutrinos, and freezing out after the QCD phase transition. Notably, if these neutrinos decay after the active neutrino decoupling, they generate extra neutrino radiation and contribute to...
In the next decade, ultra-high-energy neutrinos in the EeV energy range will be potentially detected by next-generation neutrino telescopes. Although their primary goals are to observe cosmogenic neutrinos and to gain insight into extreme astrophysical environments, they have the great potential of indirectly probing the nature of dark matter. In this talk, we study the projected sensitivity...
We study the connection between the two indications of physics beyond the Standard Model (SM): the masses and mixing of neutrinos and the existence of dark matter (DM). To have a more testable connection, we consider a minimal type Ib seesaw model instead of the traditional type I seesaw model. In the minimal type Ib seesaw model, the effective neutrino mass operator involves two different...
In ΛCDM cosmology, Dark Matter (DM) and neutrinos are assumed to be non-
interacting. However, several BSM scenarios require DM-neutrino interaction, leading to
DM-neutrino scattering and annihilation of DM into neutrinos. We investigate this scenario
by analysing the PLANCK-2018 and BOSS-BAO 2014 dataset and constrain strength of such
interactions. We also discuss a particle DM model...
