Quantum mechanics of baryogenesis

Buchmüller, W.; Fredenhagen, Stefan

doi:10.1016/s0370-2693(00)00573-6

Cited by 122 publications

(187 citation statements)

References 19 publications

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“…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 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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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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“…This was first realized in [32], where the EFT 1 Lagrangian and the CP asymmetry were computed up to order 1/M i .…”

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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“…Because of the hierarchy of the masses, we can integrate out M 2 and M 3 obtaining an effective model for M 1 with a Lagrangian given by (cf. [73])…”

Section: Effective Modelmentioning

confidence: 99%

“…The quantum Boltzmann equations represent a first order approximation to a full quantum theory [73]. They are only valid when the width of the generated particle in the plasma is small.…”

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Quantum mechanics of leptogenesis

Mendizabal

2011

Progress in Particle and Nuclear Physics

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Leptogenesis is an attractive mechanism that simultaneously explains the matterantimatter asymmetry of the universe as well as the small masses of the standard model neutrinos. This is performed by naturally extending the standard model with the insertion of right handed neutrinos. Leptogenesis is usually studied via the semi-classical Boltzmann equations. However, these equations suffer from basic conceptual problems and they lack to include many quantum phenomena, such as memory effects and coherence oscillations. In order to fully describe leptogenesis, a full quantum treatment is required. In this work we show how to address leptogenesis systematically in a purely quantum way. We start by studying scalar and fermionic excitations in a plasma by solving the Kadanoff-Baym equations of motion for Green's functions, with significant emphasis on the initial and boundary conditions of the solutions. We compute analytically the asymmetry generated from the departure of equilibrium of a particle in a thermal bath. The comparison with the semi-classical Boltzmann approach is also analysed, leading to a qualitative difference between both methods. The non-locality of the Kadanoff-Baym equations shows how off-shell effects can have a huge impact on the generated asymmetry, effects that cannot be studied with the Boltzmann equations. The insertion of standard model interactions like the decay widths for the particles of the bath is also discussed. We explain how with a trivial insertion of these widths we regain locality on the processes, i.e. we regain the Boltzmann equations.

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Quantum mechanics of baryogenesis

Cited by 122 publications

References 19 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

Quantum mechanics of leptogenesis

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