Leptogenesis via neutrino oscillation magic

2018

Physics Letters B

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We show a possibility for the charge quantization of the standard model (SM) particles. If a global symmetry makes the three copies of a generation and supersymmetry (SUSY) relates the Higgs boson to a lepton, all the charges of the SM particles can be quantized through gauge-anomaly cancellation. In the minimal model realizing the possibility, the gravitino mass around the Planck-scale is needed to generate the SM couplings through (quantum) supergravity. Much below the Planck-scale, the SM with non-vanishing neutrino masses is obtained as the effective theory. As extensions of the SM with this quantization mechanism, millicharged particles can exist without introducing massless hidden photons.

Section: Neutrino Scale and Gaugino Massmentioning

confidence: 99%

Charge quantization and neutrino mass from Planck-scale SUSY

2018

Physics Letters B

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“…A similar mechanism has been considered in the context of active neutrino oscillation with higher dimensional terms for T R 10 8 GeV [23]. It was shown that baryogenesis is possible in the SM plus the dimension five Majorana neutrino mass term, LLHH, explaining the ordinary neutrino oscillation [24]. The key point is that the leptons, produced from the inflaton decays or the scatterings of the plasma, undergo flavor oscillation due to the thermal masses.…”

Section: Jhep07(2020)174mentioning

confidence: 92%

Direct baryogenesis in the broken phase

Asaka

Ishida

2020

J. High Energ. Phys.

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We show a new mechanism for baryogenesis where the reheating temperature can be smaller than the electroweak scale. The baryon number symmetry is violated by a dimension nine operator which conserves a baryon parity. A high energy quark from the decay of a heavy particle, e.g. inflaton, modulus or gravitino, undergoes flavor oscillation, and is thermalized due to the scatterings with the ambient thermal plasma. We point out that the baryon asymmetry of our universe can be generated due to the scatterings via the baryon number violating operator. Our scenario can be tested in neutron-antineutron oscillation experiments as well as other terrestrial experiments.

“…To avoid the proton decays, one can introduce a Z 2 symmetry under which SM leptons are odd but the baryons are even or vise versa. In this case, the baryon asymmetry may be correctly obtained from neutrino oscillation with the higher dimensional term (3.24) [84,85] and also the quark oscillation could be important via the baryon-number-violating but baryon-parity-conserving operator [86]. Lastly, let us mention the confinement of SO(N ).…”

Section: 3 Cosmologymentioning

confidence: 93%

Scale and quality of Peccei-Quinn symmetry and weak gravity conjectures

2020

J. High Energ. Phys.

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The promising solution to the strong CP problem by a Peccei-Quinn (PQ) symmetry may introduce quality and hierarchy problems, which are both relevant to Planck physics. In this paper, we study whether both problems can be explained by introducing a simple hidden gauge group which satisfies the WGC or its variant. As a concrete example, we point out that a weakly-coupled hidden SU(N ) gauge symmetry, which is broken down to SO(N ), can do this job in the context of a Tower/sub-Lattice WGC. Cosmology is discussed.