Results 61 to 70 of about 691 (101)

A Review of WIMP Baryogenesis Mechanisms

, 2015
It was recently proposed that weakly interacting massive particles (WIMP) may provide new ways of generating the observed baryon asymmetry in the early universe, as well as addressing the cosmic coincidence between dark matter and baryon abundances. This
Cui, Yanou
core   +1 more source

Leptogenesis in realistic flipped SU(5)

Journal of High Energy Physics
We study thermal leptogenesis in realistic supersymmetric flipped SU(5) × U(1) unification. As up-type quarks and neutrinos are arranged in the same multiplets, they exhibit strong correlations, and it is commonly believed that the masses of right-handed
Stephen F. King, George K. Leontaris, Luca Marsili, Ye-Ling Zhou   +3 more
doaj   +1 more source

Low-Scale Leptogenesis and the Domain Wall Problem in Models with Discrete Flavor Symmetries

, 2010
We propose a new mechanism for leptogenesis, which is naturally realized in some models with a flavor symmetry based on the discrete group A_4, where the symmetry breaking parameter also controls the Majorana masses for the heavy right handed (RH ...
Abada, Abada, Adhikary, Affleck, Agashe, Altarelli, Altarelli, Basboll, Bertuzzo, Buchmuller, Covi, Dine, Dolan, Dunkley, Ellis, Falomkin, Feruglio, Feruglio, Francesco Riva, Froggatt, Fukugita, Gell-Mann, Giudice, Glashow, Gonzalez-Garcia, Gripaios, Hagedorn, Harrison, Kawasaki, Khlopov, Kibble, Kuzmin, Mohapatra, Preskill, Riotto, Schwetz, Vilenkin, Yamamoto, Zeldovich   +38 more
core   +1 more source

Baryogenesis via QCD preheating with nonadiabatic baryon chemical potential

Journal of High Energy Physics
The chiral phase transition in QCD can be supercooled in the thermal history of the universe to be instantaneously out-of equilibrium, if QCD is coupled to a dark QCD sector exhibiting the dark chiral phase transition of the first order. In that case the
Jimin Wang, Xin-Ru Wang, Shinya Matsuzaki   +2 more
doaj   +1 more source

Unified origin of curvature perturbation and baryon asymmetry of the universe

Journal of High Energy Physics
We propose a unified framework that describes both the curvaton mechanism for generating primordial density fluctuations and the Affleck-Dine (AD) mechanism for baryogenesis.
Anish Ghoshal, Abhishek Naskar, Nobuchika Okada   +2 more
doaj   +1 more source

Cosmology and short-distance gravity

, 2015
If the observed dark-energy density $\rho_\Lambda$ is interpreted as the net contribution of the energy density of the vacuum, $\rho_\Lambda \equiv \rho_V \sim M_V^4$, and the corresponding vacuum length scale $\lambda_V = M_V^{-1}$ as the cutoff scale ...
Gasperini, M.
core   +1 more source

Low-Scale Leptogenesis in the Scotogenic Neutrino Mass Model

, 2018
The scotogenic model proposed by Ernest Ma represents an attractive and minimal example for the generation of small Standard Model neutrino masses via radiative corrections in the dark matter sector.
Hugle, Thomas, Platscher, Moritz, Schmitz, Kai   +2 more
core   +1 more source

Affleck-Dine leptoflavorgenesis

Journal of High Energy Physics
We propose a scenario to produce large primordial lepton flavor asymmetries with vanishing total lepton asymmetry, based on the Affleck-Dine mechanism with Q-ball formation.
Kensuke Akita, Koichi Hamaguchi, Maksym Ovchynnikov   +2 more
doaj   +1 more source

Spectator Effects during Leptogenesis in the Strong Washout Regime

, 2014
By including spectator fields into the Boltzmann equations for Leptogenesis, we show that partially equilibrated spectator interactions can have a significant impact on the freeze-out value of the asymmetry in the strong washout regime.
Garbrecht, Bjorn, Schwaller, Pedro
core   +1 more source

Revisiting the minimal Nelson-Barr model

Journal of High Energy Physics
We revisit the minimal Nelson-Barr model for solving the strong CP problem through the idea of spontaneous CP breaking. The minimal model suffers from the quality problem, which means that the strong CP angle is generated by higher-dimensional operators ...
Kai Murai, Kazunori Nakayama
doaj   +1 more source