THERMAL LEPTOGENESIS IN SO(10) GUT

I discuss the possibility of generating the observed baryon number in the universe through the lepton-number violating processes in a class of SO(10) grand unification theories. The key ingredient is the CP violating decay of the heavy right-handed neutrinos out of thermal equilibrium.

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NEUTRINO COUPLING TO COSMOLOGICAL BACKGROUND: A REVIEW ON GRAVITATIONAL BARYO/LEPTOGENESIS

International Journal of Modern Physics D ◽

10.1142/s0218271813300309 ◽

2013 ◽

Vol 22 (12) ◽

pp. 1330030 ◽

Cited By ~ 31

Author(s):

GAETANO LAMBIASE ◽

SUBHENDRA MOHANTY ◽

ARAGAM R. PRASANNA

Keyword(s):

Field Theory ◽

Gravitational Field ◽

Thermal Equilibrium ◽

Energy Levels ◽

Lepton Number ◽

Cpt Symmetry ◽

Cosmological Background ◽

The Universe ◽

General Conditions ◽

Lepton Number Violating

In this paper, we review the theories of origin of matter–antimatter asymmetry in the universe. The general conditions for achieving baryogenesis and leptogenesis in a CPT conserving field theory have been laid down by Sakharov. In this review, we discuss scenarios where a background scalar or gravitational field spontaneously breaks the CPT symmetry and splits the energy levels between particles and antiparticles. Baryon or Lepton number violating processes in proceeding at thermal equilibrium in such backgrounds gives rise to Baryon or Lepton number asymmetry.

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Light Lepton Number Violating Sneutrinosand the Baryon Number of the Universe

Beyond the Desert 99 ◽

10.1201/9781482268867-42 ◽

2000 ◽

pp. 513-524

Keyword(s):

Baryon Number ◽

Lepton Number ◽

The Universe ◽

Lepton Number Violating

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Freeze-in Dirac neutrinogenesis: thermal leptonic CP asymmetry

The European Physical Journal C ◽

10.1140/epjc/s10052-020-08696-z ◽

2020 ◽

Vol 80 (12) ◽

Author(s):

Shao-Ping Li ◽

Xin-Qiang Li ◽

Xin-Shuai Yan ◽

Ya-Dong Yang

Keyword(s):

Thermal Equilibrium ◽

Charged Lepton ◽

Baryon Number ◽

Lepton Number ◽

Cp Asymmetry ◽

Mixing Angle ◽

Neutrino Sector ◽

The Right ◽

Baryon Number Asymmetry ◽

The Universe

AbstractWe present a freeze-in realization of the Dirac neutrinogenesis in which the decaying particle that generates the lepton-number asymmetry is in thermal equilibrium. As the right-handed Dirac neutrinos are produced non-thermally, the lepton-number asymmetry is accumulated and partially converted to the baryon-number asymmetry via the rapid sphaleron transitions. The necessary CP-violating condition can be fulfilled by a purely thermal kinetic phase from the wavefunction correction in the lepton-doublet sector, which has been neglected in most leptogenesis-based setup. Furthermore, this condition necessitates a preferred flavor basis in which both the charged-lepton and neutrino Yukawa matrices are non-diagonal. To protect such a proper Yukawa structure from the basis transformations in flavor space prior to the electroweak gauge symmetry breaking, we can resort to a plethora of model buildings aimed at deciphering the non-trivial Yukawa structures. Interestingly, based on the well-known tri-bimaximal mixing with a minimal correction from the charged-lepton or neutrino sector, we find that a simultaneous explanation of the baryon-number asymmetry in the Universe and the low-energy neutrino oscillation observables can be attributed to the mixing angle and the CP-violating phase introduced in the minimal correction.

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Light lepton number violating sneutrinos and the baryon number of the universe

Physical Review D ◽

10.1103/physrevd.62.035014 ◽

2000 ◽

Vol 62 (3) ◽

Cited By ~ 7

Author(s):

H. V. Klapdor-Kleingrothaus ◽

St. Kolb ◽

V. A. Kuzmin

Keyword(s):

Baryon Number ◽

Lepton Number ◽

The Universe ◽

Lepton Number Violating

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LEE–YANG FORCE, GAUGE SYMMETRY AND "DARK ENERGY"

Modern Physics Letters A ◽

10.1142/s0217732305018876 ◽

2005 ◽

Vol 20 (37) ◽

pp. 2855-2859 ◽

Cited By ~ 4

Author(s):

JONG-PING HSU

Keyword(s):

Dark Energy ◽

Gauge Symmetry ◽

Baryon Number ◽

Lepton Number ◽

Repulsive Force ◽

Baryonic Matter ◽

Gauge Invariant ◽

Einstein's Equation ◽

Expansion Of The Universe ◽

The Universe

In 1955, Lee and Yang discussed a new massless gauge field based on the established conservation of baryon number. They predicted the existence of a repulsive force between baryonic matter, just as the conservation of electron–lepton number was later shown to imply the existence of a repulsive force between electrons. Although Eötvös experiments showed the force to be undetectably small at that time, such a force may be related to the dark-energy-induced acceleration of the expansion of the universe. If the gauge invariant Lagrangian involves a spacetime derivative of the field strength, the resultant potential has properties similar to that of the "dark energy" implied by the cosmological constant in the Einstein's equation.

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Lepton number violation and the baryon asymmetry of the universe

International Journal of Modern Physics A ◽

10.1142/s0217751x15300458 ◽

2015 ◽

Vol 30 (17) ◽

pp. 1530045 ◽

Cited By ~ 7

Author(s):

Julia Harz ◽

Wei-Chih Huang ◽

Heinrich Päs

Keyword(s):

Beta Decay ◽

Neutrinoless Double Beta Decay ◽

Lepton Number ◽

Baryon Asymmetry ◽

Double Beta Decay ◽

Lepton Number Violation ◽

Low Energies ◽

Tight Connection ◽

The Universe ◽

Lepton Number Violating

Neutrinoless double beta decay, lepton number violating collider processes and the Baryon Asymmetry of the Universe (BAU) are intimately related. In particular, lepton number violating processes at low energies in combination with sphaleron transitions will typically erase any preexisting BAU. In this contribution, we briefly review the tight connection between neutrinoless double beta decay, lepton number violating processes at the LHC and constraints from successful baryogenesis. We argue that far-reaching conclusions can be drawn unless the baryon asymmetry is stabilized via some newly introduced mechanism.

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LIGHT LEPTOQUARKS AS POSSIBLE SIGNATURE OF STRONG-ELECTROWEAK UNIFICATION

Modern Physics Letters A ◽

10.1142/s0217732392000525 ◽

1992 ◽

Vol 07 (07) ◽

pp. 559-562 ◽

Cited By ~ 25

Author(s):

PAUL H. FRAMPTON

Keyword(s):

Baryon Number ◽

Proton Decay ◽

Lepton Number ◽

Grand Unification

In strong-electroweak unification, based on SU(15), with baryon number (B) and lepton number (L) conserved, bosons with B=±2/3, L=0 (diquarks), B=0, L=±2 (dileptons) and B=±1/3, L=±1 (leptoquarks) can occur at “light” (≤ TeV) scales. The discovery of light leptoquarks would be evidence as compelling as proton decay for grand unification.

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AFFLECK–DINE LEPTOGENESIS IN THE RADIATIVE NEUTRINO MASS MODEL

International Journal of Modern Physics A ◽

10.1142/s0217751x11051548 ◽

2011 ◽

Vol 26 (06) ◽

pp. 995-1009 ◽

Cited By ~ 14

Author(s):

H. HIGASHI ◽

T. ISHIMA ◽

D. SUEMATSU

Keyword(s):

Dark Matter ◽

Neutrino Mass ◽

Baryon Number ◽

Lepton Number ◽

Neutrino Masses ◽

Alternative Possibility ◽

Mass Model ◽

Neutrino Mass Models ◽

Baryon Number Asymmetry ◽

The Universe

Radiative neutrino mass models have interesting features, which make it possible to relate neutrino masses to the existence of dark matter. However, the explanation of the baryon number asymmetry in the universe seems to be generally difficult as long as we suppose leptogenesis based on the decay of thermal right-handed neutrinos. Since right-handed neutrinos are assumed to have masses of O(1) TeV in these models, they are too small to generate the sufficient lepton number asymmetry. Here we consider Affleck–Dine leptogenesis in a radiative neutrino mass model by using a famous flat direction LHu as an alternative possibility. The constraint on the reheating temperature could be weaker than the ordinary models. The model explains all the origin of the neutrino masses, the dark matter, and also the baryon number asymmetry in the universe.

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