In this talk, I will introduce the Big Bang nucleosynthesis (BBN) constraint on the majoron-like particle in the mass range between 1MeV to 10GeV which dominantly decays into the standard model neutrinos. For a lifetime shorter than 1 sec, the majoron heats up the background plasma by injecting neutrinos and changes the relation of photon temperature and background neutrino temperature,...
I will discuss the halo-independent bounds on the WIMP-nucleon couplings of the non-relativistic effective Hamiltonian that drives the scattering process off nuclei of a WIMP of spin 1/2 combining direct detection experiments and neutrino telescopes data in order to cover the full WIMP incoming speed range.
In the elastic interactions, for most of the couplings the degree of relaxation of...
We propose a minimal scenario for light thermal dark matter (DM) in sub-GeV to GeV ballpark by incorporating a scalar singlet DM in a type-I seesaw scenario extended by an additional Higgs doublet ϕ2. The latter permits efficient annihilation of light scalar DM into leptonic final states including right-handed neutrinos (RHN). While DM annihilation into charged lepton final states is kept...
In this talk I will discuss how the Weakly Interacting Massive Particle (WIMP) thermal decoupling scenario can be used to probe Cosmologies in dilatonic Einstein Gauss-Bonnet (dEGB) gravity, where the Gauss–Bonnet term is non–minimally coupled to a scalar field with vanishing potential. Constraints on the model parameters can be obtained when the ensuing modified cosmological scenario drives...
