Radiative Neutrino Mass Generation and Dark Matter - Institute for ...

Dark MatterDM Thermal ProductionDM Thermal ProductionY = n/sDM number density is determined by decoupling from thermalbath in the universe.Number density follows the Boltzmann equation.dYdz = −ΓY eqHz[ ( YY eq) 2−1], z ≡ m T , Γ ≡ 〈σv〉n eq, Y ≡ n sapproximate solutionΩh 2 ≈ 1.04×109 [GeV −1 ]√g∗ m pl 〈σv〉= 0.12 (Planck)z = m/T↔ 〈σv〉 ≈ 3×10 −26 [cm 3 /s]= 3×10 −9 [GeV −2 ]Takashi Toma (IPPP) Internal Seminar 7th June 2013 11 / 34