14 Apr/21
16:30 - 18:30 (Europe/Zurich)

The Hubble Tension as a Signal of low-scale Leptogenesis and Neutrino Mass Generation


Zoom Only at CERN

In this talk based on Arxiv:1909.04044 and Arxiv:2103.03249, I will show that a primordial population of majorons together with their very feeble interactions with neutrinos (lam~ 10^{-13}) can substantially ameliorate the Hubble tension. The majoron is a neutrinophilic pseudo-Goldstone boson that is naturally linked to the neutrino mass mechanism in scenarios with a spontaneously broken global U(1)L symmetry. I will argue that majoron masses around the eV-scale can be associated to the explicit breaking of global symmetries by planck-scale physics. I will further show that within the same set up, the GeV-scale sterile neutrinos that can be responsible for generating active neutrino masses and leptogenesis via neutrino oscillations can, as a result of their decays, also provide the right primordial majoron population to account for a larger value of H0. Thus, providing a link between low-scale leptogenesis, neutrino mass generation and the Hubble tension. 


Zoom link:
Meeting ID: 983 994 99159
Passcode: 323288