Hypercharge and the cosmological baryon asymmetry

Antaramian, Aram; Hall, Lawrence J.; Rašin, Andrija

doi:10.1103/physrevd.49.3881

Cited by 23 publications

(22 citation statements)

References 33 publications

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“…Finally, we discuss the flavor structure of several nucleon decay modes. We observe surprising enhancement of the decays in charged lepton modes [28), as opposed to more conventional SU(5) considerations.…”

Section: Introductionmentioning

confidence: 81%

“…Several solutions exist, such as the popular weak scale baryogenesis [22] in which there is no need for a primordial baryon asymmetry. In section 3, a different possibility is explained [23]. It is shown that the primordial baryon symmetry, in the presence of flavor changing interactions, can be saved by simply adding a new charged partide with its own asymmetry.…”

Section: Introductionmentioning

confidence: 99%

“…However, the overall rate depends on the sizes of the Clebsches as well as on how the colored triplet mass was generated [28].…”

mentioning

confidence: 99%

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Flavor symmetries and fermion masses

Rašin

1994

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We introduce several ways in which approximate flavor symmetries act on fermions and which are consistent with observed fermion masses and mixings. Flavor changing interactions mediated by new scalars appear as a consequence of approximate flavor symmetries. We discuss the experimental limits on masses of the new scalars, and show that the masses can easily be of the order of weak scale. Some implications for neutrino physics are also discussed. , Such flavor changing interactions would easily erase any primordial baryon asymmetry. We show that this situation can be saved by simply adding a new charged particle with its own asymmetry. The neutrality of the Universe, together with sphaleron processes, then ensures a survival of baryon asymmetry.Several topics on flavor structure of the supersymmetric grand unified theories are discussed. First, we show that the successful predictions for the Kobayashi-Maskawa mixing matrix elements, Vu&/Vcb = 1 Jm.,Jmc and "Vtd/Vts Jmd/m 8 , are a consequence of a large class of models, rather than specific properties of a few models. Second, we discuss how the recent observation of the decay b -+ S/ constrains the parameter space when the ratio of the vacuum expectation values of the two Higgs doublets, tan/3, is large. Finally, we discuss the flavor structure of proton decay. We observe a surprising enhancement of the branching ratio for the muon mode in S0(10) models compared to the same mode in the SU(5) model.

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Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Flavor symmetries and fermion masses

Rašin

1994

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“…-✓ --COBRA 116 Cd (and 130 Te) 5 We note here that if lepton number is violated not by two units but by three or more, there will be no neutrinoless double beta decay, but rather processes with L 3, 4, D = ¼ One explicit example is 'neutrinoless quadruple beta decay' presented in [22].…”

Section: Camentioning

confidence: 88%

Neutrinoless double beta decay

Päs¹,

Rodejohann²

2015

New J. Phys.

126

104

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“…But detailed calculations [11] belied this hope by revealing that e R enter chemical equilibrium, at T < ∼ 10T eV , well before the sphalerons have dropped out of thermal equilibrium. Antaramian et al [12] also discuss survival of baryon asymmetry but without any models.…”

Section: Footnotesmentioning

confidence: 99%

GUT's have the guts to defy sphalerons

Mohan

1996

Physics Letters B

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We show that the baryon asymmetry produced by the out of equilibrium decay of heavy GUT scalars can be the baryon asymmetry that is observed today. No restrictions need be imposed on the initial values of B, L and B − L, nor on the neutrino masses; no new symmetries need be gauged nor new fermions introduced. We find two mechanisms that can bring this about for any GUT gauge group. Two illustrative models are discussed that are robust, and need just two (at most four) more GUT scalar fields than the minimal model. The additional scalar fields can also help in generating an adequately large value of the CP violation parameter and in efficiently annihilating the monopoles. Our work should firmly re-establish heavy GUT scalars as probable progenitors of today's baryon asymmetry.

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Hypercharge and the cosmological baryon asymmetry

Cited by 23 publications

References 33 publications

Flavor symmetries and fermion masses

Flavor symmetries and fermion masses

Neutrinoless double beta decay

GUT's have the guts to defy sphalerons

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