Dec 14 – 15, 2023
Centre for Particle Theory
Europe/London timezone

Long-Lived Heavy Neutral Leptons in Cosmology

Dec 14, 2023, 2:55 PM
Ph8 (Centre for Particle Theory)


Centre for Particle Theory

Gong Show Talk (5 mins) Gong Show Talks


Zhong Zhang (UCL)


Heavy Neutral Leptons (HNLs) are a popular extension of the Standard Model to explain the lightness of neutrino masses and the matter-antimatter asymmetry through leptogenesis. Cosmology can constraint the regime of active-sterile neutrino mixing in a standard Seesaw scenario of neutrino mass generation for HNL masses around $m_N \lesssim 1$~GeV. Motivated by this, we analyse HNL-ALP coupling and its impact on cosmology. Following an analytic discussion of the Big Bang Nucleosynthesis, ALP populations and other cosmological facts which can constraint the nature of sterile neutrinos and ALPs.

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Primary author


Dr Chayan Majumdar (University College London) Frank Deppisch (UCL) Tomas Gonzalo (KIT)

Presentation materials