Systematic approach to leptogenesis in nonequilibrium QFT: Self-energy contribution to the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>-violating parameter

Garny, Mathias; Hohenegger, Andreas; Kartavtsev, Alexander; Lindner, M.

doi:10.1103/physrevd.81.085027

Cited by 87 publications

(121 citation statements)

References 78 publications

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“…[49] which gives the dependence on the distribution functions 1+η i f eq i +η j f eq j in agreement with the results derived from nonequilibrium quantum field theory [48,[50][51][52][53][54][55][56][57][58][59][60][61][62] in contrast to the results of Refs. [31,63] …”

Section: Discussionsupporting

confidence: 86%

NonthermalCPviolation in soft leptogenesis

et al. 2015

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Soft leptogenesis is a mechanism which generates the matter-antimatter asymmetry of the Universe via the out-of-equilibrium decays of heavy sneutrinos in which soft supersymmetry breaking terms play two important roles: they provide the required CP violation and give rise to the mass splitting between otherwise degenerate sneutrino mass eigenstates within a single generation. This mechanism is interesting because it can be successful at the lower temperature regime T 10 9 GeV in which the conflict with the overproduction of gravitinos can possibly be avoided. In earlier works the leading CP violation is found to be nonzero only if finite temperature effects are included. By considering generic soft trilinear couplings, we find two interesting consequences: (1) the leading CP violation can be nonzero even at zero temperature realizing nonthermal CP violation, and (2) the CP violation is sufficient even far away from the resonant regime allowing soft supersymmetry breaking parameters to assume natural values at around the TeV scale. We discuss phenomenological constraints on such scenarios and conclude that the contributions to charged lepton flavor violating processes are close to the sensitivities of present and future experiments.

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Section: Discussionsupporting

confidence: 86%

NonthermalCPviolation in soft leptogenesis

et al. 2015

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“…Finally, we did not solve the full quantum Boltzmann equations based on the Keldysh-Schwinger non-equilibrium formalism; for recent related work see Ref. [36]. Note that in this formalism, thermal corrections are automatically taken into account.…”

Section: Resultsmentioning

confidence: 99%

Examining leptogenesis with lepton flavor violation and the dark matter abundance

Blanchet

Marfatia

Mustafayev

2010

J. High Energ. Phys.

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Within a supersymmetric (SUSY) type-I seesaw framework with flavor-blind universal boundary conditions, we study the consequences of requiring that the observed baryon asymmetry of the Universe be explained by either thermal or non-thermal leptogenesis. In the former case, we find that the parameter space is very constrained. In the bulk and stop-coannihilation regions of mSUGRA parameter space (that are consistent with the measured dark matter abundance), lepton flavor-violating (LFV) processes are accessible at MEG and future experiments. However, the very high reheat temperature of the Universe needed after inflation (of about 10 12 GeV) leads to a severe gravitino problem, which disfavors either thermal leptogenesis or neutralino dark matter. Non-thermal leptogenesis in the preheating phase from SUSY flat directions relaxes the gravitino problem by lowering the required reheat temperature. The baryon asymmetry can then be explained while preserving neutralino dark matter, and for the bulk or stop-coannihilation regions LFV processes should be observed in current or future experiments.

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“…and finally attempts to provide a full quantum mechanical formulation of thermal leptogenesis [11][12][13][14][15][16][17][18][19]. By constrast, much less work has been devoted to the leptogenesis scenarios involving fermionic [20][21][22][23][24] or scalar [25][26][27][28][29][30][31][32] electroweak triplets (for a recent review of these scenarios and additional references, see refs.…”

Section: Jhep05(2015)124mentioning

confidence: 99%

Flavour always matters in scalar triplet leptogenesis

Lavignac

Schmauch

2015

J. High Energ. Phys.

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We present a flavour-covariant formalism for scalar triplet leptogenesis, which takes into account the effects of the different lepton flavours in a consistent way. Our main finding is that flavour effects can never be neglected in scalar triplet leptogenesis, even in the temperature regime where all charged lepton Yukawa interactions are out of equilibrium. This is at variance with the standard leptogenesis scenario with heavy Majorana neutrinos. In particular, the so-called single flavour approximation leads to predictions for the baryon asymmetry of the universe that can differ by a large amount from the flavour-covariant computation in all temperature regimes. We investigate numerically the impact of flavour effects and spectator processes on the generated baryon asymmetry, and find that the region of triplet parameter space allowed by successsful leptogenesis is significantly enlarged.

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Systematic approach to leptogenesis in nonequilibrium QFT: Self-energy contribution to theCP-violating parameter

Cited by 87 publications

References 78 publications

NonthermalCPviolation in soft leptogenesis

NonthermalCPviolation in soft leptogenesis

Examining leptogenesis with lepton flavor violation and the dark matter abundance

Flavour always matters in scalar triplet leptogenesis

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