The presence of new relic sterile neutrinos at eV energy mass, their clustering as dark warm matter halos, their target for ZeV UHE neutrinos, might lead to UHECR uncorrelated signals with nearby sources, overcoming the GZK cut off. The ability of sterile neutrinos to solve at once different puzzle of theoretical physics and astrophysics will be shown in details.
In the poster, we have taken $L_e-L_\tau$ gauge symmetry to study neutrino phenomenology in the framework of type-(I+II) seesaw mechanism. In the model, three heavy right-handed neutrinos, a scalar singlet, and one scalar triplet are added to the Standard Model. As a result, the active neutrino-mass matrix has a two-zero $A_1$ texture which helps explain neutrino oscillation parameters like...
