Results 1 to 10 of about 5,564 (231)
Bubble-assisted leptogenesis [PDF]
Journal of High Energy Physics, 2023 We explore the possibility of embedding thermal leptogenesis within a first-order phase transition (FOPT) such that RHNs remain massless until a FOPT arises.
Eung Jin Chun +4 more
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Impact of high-scale Seesaw and Leptogenesis on inflationary tensor perturbations as detectable gravitational waves [PDF]
Journal of High Energy Physics, 2023 We discuss the damping of inflationary gravitational waves (GW) that re-enter the horizon before or during an epoch, where the energy budget of the universe is dominated by an unstable right handed neutrino (RHN), whose out of equilibrium decay releases ...
Maximilian Berbig, Anish Ghoshal
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Superradiant leptogenesis [PDF]
Journal of High Energy Physics, 2023 We investigate how superradiance affects the generation of baryon asymmetry in a universe with rotating primordial black holes, considering a scenario where a scalar boson is coupled to the heavy right-handed neutrinos.
A. Ghoshal +2 more
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Aspects of high scale leptogenesis with low-energy leptonic CP violation [PDF]
Journal of High Energy Physics, 2021 Using the density matrix equations (DME) for high scale leptogenesis based on the type I seesaw mechanism, in which the CP violation (CPV) is provided by the low-energy Dirac or/and Majorana phases of the neutrino mixing (PMNS) matrix, we investigate the
A. Granelli, K. Moffat, S. T. Petcov
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Thermal leptogenesis in nonextensive cosmology [PDF]
European Physical Journal C: Particles and Fields, 2023 Thermal leptogenesis is a mechanism that explains the observed asymmetry between matter and antimatter in the early universe. In this study, we review the impact of nonextensive Tsallis statistical mechanics on the early universe and study its effect on ...
Mehran Dehpour
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Gravitational waves-tomography of Low-Scale-Leptogenesis [PDF]
Journal of High Energy Physics, 2022 A long-lived scalar field (Φ) which couples weakly to the right-handed (RH) neutrinos (NRi), generates small RH neutrino masses (Mi) in Low-Scale-Leptogenesis (LSL) mechanisms, despite having a large vacuum expectation value vΦ.
Satyabrata Datta, Rome Samanta
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Leptogenesis in parity solutions to the strong CP problem and Standard Model parameters [PDF]
Journal of High Energy Physics, 2023 We study the simplest theories with exact spacetime parity that solve the strong CP problem and successfully generate the cosmological baryon asymmetry via decays of right-handed neutrinos.
Juanca Carrasco-Martinez +3 more
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Towards a systematic study of non-thermal leptogenesis from inflaton decays [PDF]
Journal of High Energy Physics, 2023 This paper investigates non-thermal leptogenesis from inflaton decays in the minimal extension of the canonical type-I seesaw model, where a complex singlet scalar ϕ is introduced to generate the Majorana masses of right-handed neutrinos (RHNs) and to ...
Xinyi Zhang
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Physics Letters B, 2009 Leptogenesis is usually realized through decays of heavy particles. In this article we consider another possibility of generating a lepton asymmetry through annihilations of heavy particles. We demonstrate our idea with a realistic extension of the standard model containing a heavy doublet and a light singlet scalars in addition to right-handed ...
Pei-Hong Gu, Utpal Sarkar
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Leptogenesis with perturbations in type-II and type-III seesaw models [PDF]
European Physical Journal C: Particles and FieldsDensity perturbations have recently been shown to lead to a novel effect in the freeze-out of heavy particles called “acoustically driven freeze-out.” This leads to an enhancement in the yield in standard leptogenesis.
Iason Baldes
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