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Conversion-Driven Leptogenesis: A Testable Theory of Dark Matter and Baryogenesis at the Electroweak Scale.
Phys Rev Lett
November 2024
Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University, 52056 Aachen, Germany and Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714, USA.
The phenomena of dark matter and the baryon asymmetry pose two of the most pressing questions in today's fundamental physics. Conversion-driven freeze-out has emerged as a successful mechanism to generate the observed dark matter relic density. It supports thermalization of dark matter despite its very weak couplings, aligning with the null results from direct and indirect detection experiments.
View Article and Find Full Text PDFWash-In Leptogenesis.
Phys Rev Lett
May 2021
FRIS, Tohoku University, Sendai, Miyagi 980-8578, Japan.
We present a leptogenesis mechanism based on the standard type-I seesaw model that successfully operates at right-handed-neutrino masses as low as a few hundred TeV. This mechanism, which we dub wash-in leptogenesis, does not require any CP violation in the neutrino sector and can be implemented even in the regime of strong wash-out. The key idea behind wash-in leptogenesis is to generalize standard freeze-out leptogenesis to a nonminimal cosmological background in which the chemical potentials of all particles not in chemical equilibrium at the temperature of leptogenesis are allowed to take arbitrary values.
View Article and Find Full Text PDFQCD axion from a spontaneously broken gauge symmetry.
J High Energy Phys
July 2020
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 200240 China.
In this paper, we show that the Peccei-Quinn (PQ) symmetry with a good quality can be realized in a simple extension of the minimal supersymmetric standard model. The PQ symmetry is a remnant of the gauge symmetry at the renormalizable level. Besides, the sufficient quality of the PQ symmetry is preserved by a non anomalous discrete gauged -symmetry and a small gravitino mass ≪ 100 GeV.
View Article and Find Full Text PDFUnifying Inflation with the Axion, Dark Matter, Baryogenesis, and the Seesaw Mechanism.
Phys Rev Lett
February 2017
Institute for Particle Physics Phenomenology, Durham University South Road, Durham DH1 3LE, United Kingdom.
A minimal extension of the standard model (SM) with a single new mass scale and providing a complete and consistent picture of particle physics and cosmology up to the Planck scale is presented. We add to the SM three right-handed SM-singlet neutrinos, a new vectorlike color triplet fermion, and a complex SM-singlet scalar σ that stabilizes the Higgs potential and whose vacuum expectation value at ∼10^{11} GeV breaks lepton number and a Peccei-Quinn symmetry simultaneously. Primordial inflation is produced by a combination of σ (nonminimally coupled to the scalar curvature) and the SM Higgs boson.
View Article and Find Full Text PDFLeptogenesis via Axion Oscillations after Inflation.
Phys Rev Lett
July 2015
Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan.
Once a light axionlike scalar field couples to the electroweak gauge bosons, its classical motion during reheating induces an effective chemical potential for the fermion number. In the presence of rapid lepton number (L)-violating processes in the plasma, such a chemical potential provides a favorable opportunity for baryogenesis via leptogenesis. We are able to demonstrate that L violation due to the exchange of heavy Majorana neutrinos is sufficient for a successful realization of this idea.
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