We study the possibility that light dark matter can be produced with right relic density by decay of other sector particles. this in a model right-handed neutrinos, singlet scalar and fermion. The heavier gives rise to lighter fermion which serves as candidate. show scalar. find mass GeV scale or MeV interaction is very weak. have GeV-TeV weak interactions Standard Model (SM) So, scenario, has ...

We present a scenario of vector dark matter production during inflation containing complex inflaton field which is charged under gauge and has symmetry breaking potential. As the rolls towards global minimum potential photons become massive with mass can be larger than Hubble scale inflation. The accumulated energy quantum fluctuations produced gives observed relic density for wide range parame...

I evaluate the dark matter budget and describe baryonic dark matter candidates and their detectability. Dark matter issues in galaxy formation theory are discussed, and I review the prospects for detecting nonbaryonic dark matter. Indirect detection via halo annihilations of the favored dark matter candidate, the SUSY LSP, provides a potential signal. The relic density of dark matter particles ...