Resonant leptogenesis from a 500 GeV doubly charged scalar in an extended Georgi-Machacek model can reproduce the observed baryon asymmetry, but the surviving parameter space pins the leptogenesis-active triplet VEV at or below 10^-2 GeV.
Effective number of neutrinos and baryon asymmetry from BBN and WMAP
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abstract
We place constraints on the number of relativistic degrees of freedom and on the baryon asymmetry at the epoch of Big Bang Nucleosynthesis (BBN) and at recombination, using cosmic background radiation (CBR) data from the Wilkinson Microwave Anisotropy Probe (WMAP), complemented by the Hubble Space Telescope (HST) Key Project measurement of the Hubble constant, along with the latest compilation of deuterium abundances and measurements of the primordial helium abundance. The agreement between the derived values of these key cosmological and particle physics parameters at these widely separated (in time or redshift) epochs is remarkable. From the combination of CBR and BBN data, we find the 2\sigma ranges for the effective number of neutrinos and for the baryon asymmetry (baryon to photon number ratio \eta) to be 1.7-3.0 and 5.53-6.76 \times 10^{-10}, respectively.
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Leptogenesis with triplet scalars at electroweak scale
Resonant leptogenesis from a 500 GeV doubly charged scalar in an extended Georgi-Machacek model can reproduce the observed baryon asymmetry, but the surviving parameter space pins the leptogenesis-active triplet VEV at or below 10^-2 GeV.