Full Boltzmann equations for leptogenesis including scattering

Hahn-Woernle, F.; Plümacher, M.; Wong, Yvonne Y. Y.

doi:10.1088/1475-7516/2009/08/028

Cited by 64 publications

(83 citation statements)

References 43 publications

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“…ref. [106]). Instead, one usually assumes kinetic equilibration of the mixing fields and approximates kinetic equations for the distribution functions by so-called rate equations for the corresponding number densities.…”

Section: Rate Equations In the Radiation-dominated Universementioning

confidence: 99%

Lepton asymmetry from mixing and oscillations

Kartavtsev

Millington

Vogel

2016

J. High Energ. Phys.

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We show how the two physically-distinct sources of CP -asymmetry relevant to scenarios of leptogenesis: (i) resonant mixing and (ii) oscillations between different flavours can be unambiguously identified within the Kadanoff-Baym formalism. These contributions are isolated by analyzing the spectral structure of the non-equilibrium propagators without relying on the definition of particle number densities. The mixing source is associated with the usual mass shells, whereas the oscillation source is identified with a third intermediate shell. In addition, we identify terms lying on the oscillation shell that can be interpreted as the destructive interference between mixing and oscillation. We confirm that identical shell structure is obtained in both the Heisenberg-and interaction-picture realizations of the Kadanoff-Baym formalism. In so doing, we illustrate the self-consistency and complementarity of these two approaches. The interaction-picture approach in particular has the advantage that it may be used to analyze all forms of mass spectra from quasi-degenerate through to hierarchical.

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Section: Rate Equations In the Radiation-dominated Universementioning

confidence: 99%

Lepton asymmetry from mixing and oscillations

Kartavtsev

Millington

Vogel

2016

J. High Energ. Phys.

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“…Therefore the right-hand side of Eq. (55) can be interpreted as a difference of two (integrated) Boltzmann-like equations-one for the particles and one for the antiparticles [23]. According to the physical interpretation of Eq.…”

Section: B Kadanoff-baym Equations For Leptonsmentioning

confidence: 99%

“…(55). Therefore, we insert the usual decomposition of the propagators G 2 fÁ; S; Sg into the spectral and statistical parts, Eq.…”

Section: Lepton Self-energiesmentioning

confidence: 99%

Systematic approach to thermal leptogenesis

et al. 2013

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In this work we study the contribution to leptogenesis from ∆L = 1 decay and scattering processes mediated by the Higgs with quarks in the initial and final states using the formalism of non-equilibrium quantum field theory. Starting from fundamental equations for correlators of the quantum fields we derive quantum-corrected Boltzmann and rate equations for the total lepton asymmetry improved in that they include quantum-statistical effects and medium corrections to the quasiparticle properties. To compute the collision term we take into account one-and two-loop contributions to the lepton self-energy and use the extended quasiparticle approximation for the Higgs two-point function. The resulting CP-violating and washout reaction densities are numerically compared to the conventional ones.

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“…In the numerical computaion we use M φ /M 1 = 10 −5[105,106], where M φ is the Higgs thermal mass needed to cut off the infrared divergences of t channel process. For the the scattering cross sections please see Ref [107].…”

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confidence: 99%

Flavoured leptogenesis and CPμτ symmetry

Samanta

Sen

2020

J. High Energ. Phys.

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We present a systematic study of leptogenesis in neutrino mass models with µτflavoured CP symmetry. In addition to the strong hierarchical N 1 -dominated scenario (N 1 DS) in the 'two flavour regime' of leptogenesis, we show that one may choose the right-handed (RH) neutrino mass hierarchy as mild as M 2 4.7M 1 for a perfectly valid hierarchical N 1 DS. This in turn reduces the lower bound on the allowed values of M 1 , compared to what is stated in the literature. The consideration of flavour effects due to the heavy neutrinos also translate into an upper bound on M 1 . It is only below this bound that the observed baryon-to-photon ratio can be realized for a standard N 1 domination, else a substantial part of the parameter space is also compatible with N 2 DS. We deduce conditions under which the baryon asymmetry produced by the second RH neutrino plays an important role. Finally, we discuss another interesting scenario where lepton asymmetry generated by N 2 in the two flavour regime faces washout by N 1 in the three flavour regime. Considering a hierarchical light neutrino mass spectrum, which is now favoured by cosmological observations, we show that at the end of N 1 -leptogenesis, the asymmetry generated by N 2 survives only in the electron flavour and around 33% of the parameter space is consistent with a pure N 2 -leptogenesis. a R.Samanta@soton.ac.uk

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Full Boltzmann equations for leptogenesis including scattering

Cited by 64 publications

References 43 publications

Lepton asymmetry from mixing and oscillations

Lepton asymmetry from mixing and oscillations

Systematic approach to thermal leptogenesis

Flavoured leptogenesis and CPμτ symmetry

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