Leptogenesis in the Universe

Fong, Chee Sheng; Nardi, Enrico; Riotto, Antonio

doi:10.1155/2012/158303

Cited by 134 publications

(152 citation statements)

References 225 publications

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“…In our situation, this could be applied to N2 and N3. 5 The impacts of the corrections we neglect have been estimated not to be larger that about 20% [83,89].…”

Section: Asymmetry Productionmentioning

confidence: 96%

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A consistent model for leptogenesis, dark matter and the IceCube signal

Fiorentin

Niro

Fornengo

2016

J. High Energ. Phys.

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We discuss a left-right symmetric extension of the Standard Model in which the three additional right-handed neutrinos play a central role in explaining the baryon asymmetry of the Universe, the dark matter abundance and the ultra energetic signal detected by the IceCube experiment. The energy spectrum and neutrino flux measured by IceCube are ascribed to the decays of the lightest right-handed neutrino N 1 , thus fixing its mass and lifetime, while the production of N 1 in the primordial thermal bath occurs via a freeze-in mechanism driven by the additional SU(2) R interactions. The constraints imposed by IceCube and the dark matter abundance allow nonetheless the heavier righthanded neutrinos to realize a standard type-I seesaw leptogenesis, with the B − L asymmetry dominantly produced by the next-to-lightest neutrino N 2 . Further consequences and predictions of the model are that: the N 1 production implies a specific power-law relation between the reheating temperature of the Universe and the vacuum expectation value of the SU(2) R triplet; leptogenesis imposes a lower bound on the reheating temperature of the Universe at 7 × 10 9 GeV. Additionally, the model requires a vanishing absolute neutrino mass scale m 1 0.

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“…In our situation, this could be applied to N2 and N3. 5 The impacts of the corrections we neglect have been estimated not to be larger that about 20% [83,89].…”

Section: Asymmetry Productionmentioning

confidence: 96%

“…Neglecting 5 flavour coupling [61,86,87,[90][91][92][93], scattering terms [79,83,94], thermal effects [95] and quantum corrections [89,96,97], the B − L asymmetry produced by N 2 , N lep,2 B−L , is given by the sum of the produced ∆ τ and ∆ τ ⊥ 2 asymmetries as [87] …”

Section: Asymmetry Productionmentioning

confidence: 99%

A consistent model for leptogenesis, dark matter and the IceCube signal

Fiorentin

Niro

Fornengo

2016

J. High Energ. Phys.

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“…We will not discuss further neither the theoretical foundation and mechanism of leptogenesis nor the phenomenology of right-handed/Majorana neutrinos, which are widely addressed in exhaustive reviews, e.g., in [15,16] and [17]. Here we will focus on one particular aspect.…”

Section: Jhep09(2016)126mentioning

confidence: 99%

“…The imaginary parts of the diagrams provide the interference between the tree-level and the one-loop vertex diagram in figure 2. At zero temperature the CP asymmetry induced by the diagrams in figure 3 is given by [15,38] …”

Section: Jhep09(2016)126mentioning

confidence: 99%

CP asymmetry in heavy Majorana neutrino decays at finite temperature: the hierarchical case

Biondini

Brambilla

Vairo

2016

J. High Energ. Phys.

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Abstract:We consider the simplest realization of leptogenesis with one heavy Majorana neutrino species much lighter than the other ones. In this scenario, when the temperature of the early universe is smaller than the lightest Majorana neutrino mass, we compute at first order in the Standard Model couplings and, for each coupling, at leading order in the termperature the CP asymmetry in the decays of the lightest neutrino into leptons and anti-leptons. We perform the calculation using a hierarchy of two effective field theories organized as expansions in the inverse of the heavy-neutrino masses. In the ultimate effective field theory, leading thermal corrections proportional to the Higgs self coupling and the gauge couplings are encoded in one single operator of dimension five, whereas corrections proportional to the top Yukawa coupling are encoded in four operators of dimension seven, which we compute.

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“…On the other hand the asymmetry produced by leptogenesis can depend strongly on the actual scale of M i . To gain a qualitative understanding of possible correlations between the lepton asymmetry and the structure of couplings predicted by CFV, free from uncertainties from the undetermined overall scale, we first focus on the simplest scenario of thermal leptogenesis (for recent reviews see [19,20]). Namely, we assume the reheating temperature T rh is much higher than M i , and N i decays in the "single lepton flavor regime."…”

Section: Leptogenesismentioning

confidence: 99%

Completing constrained flavor violation: Lepton masses, neutrinos, and leptogenesis

Cline¹,

Díaz-Furlong²,

Ren³

2016

Phys. Rev. D

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Constrained flavor violation is a recent proposal for predicting the down-quark Yukawa matrix in terms of those for up quarks and charged leptons. We study the viability of CFV with respect to its predictions for the lepton mass ratios, showing that this remains a challenge, and suggest some possible means for improving this shortcoming. We then extend CFV to include neutrinos, and show that it leads to interesting predictions for hierachical heavy neutrinos, and leptogenesis dominated by decays of the second heaviest one ("N2 leptogenesis"), as well as the possibility of low-scale leptoquark-mediated exotic decays.

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Leptogenesis in the Universe

Cited by 134 publications

References 225 publications

A consistent model for leptogenesis, dark matter and the IceCube signal

A consistent model for leptogenesis, dark matter and the IceCube signal

CP asymmetry in heavy Majorana neutrino decays at finite temperature: the hierarchical case

Completing constrained flavor violation: Lepton masses, neutrinos, and leptogenesis

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