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June 22, 2020 to July 2, 2020
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Could the Hubble Tension be Pointing Toward the Neutrino Mass Mechanism?

Not scheduled


Miguel Escudero (King's College London)


Local measurements of the Hubble constant currently disagree with the high-precision value that is inferred from the CMB under the assumption of a ΛCDM cosmology. The significance of this tension clearly motivates studying extensions of the standard cosmological model capable of addressing this outstanding issue.
In this poster, based on ArXiv:1909.04044, I will show that the Majoron - a pseudo-Goldstone boson arising from the spontaneous breaking of a global lepton number symmetry and often associated with the neutrino mass mechanism - can help to reduce the Hubble tension. Importantly, I will also show that current CMB observations can constrain neutrino-Majoron couplings as small as 10^{−13}, which within the type-I seesaw mechanism correspond to scales of lepton number breaking as high as ∼1TeV.


A CMB search for the Neutrino Mass Mechanism and its Relation to the Hubble Tension

Primary authors

Miguel Escudero (King's College London) Sam Witte (IFIC)

Presentation Materials