The Korean Physical Society 06130 22, Teheran-ro 7-gil, Gangnam-gu, Seoul, Republic of Korea 610 Representation : Tae Won NOH TEL: 02-556-4737 FAX: 02-554-1643 E-mail : Copyright(C) KPS, All rights reserved.
30 May 2022 to 4 June 2022
Virtual Seoul
Asia/Seoul timezone

Flavor-specific Neutrino self-interaction in Cosmology

Not scheduled
Virtual Seoul

Virtual Seoul

Poster Neutrinos and cosmology Poster


Subhajit Ghosh (University of Notre Dame)


Neutrino self-interaction has been proposed as a solution to the Hubble tension, a discrepancy between the measured values of the Hubble constant from CMB and low-redshift data. However, flavor-universal neutrino self-interaction is highly constrained by BBN and laboratory experiments such as K-meson and tau decay, double-neutrino beta decay etc. In this talk, I will discuss the cosmology of flavor specific neutrino self-interaction where only one or two neutrino flavor states are self-interacting. Such flavor-specific interactions are less constrained by laboratory experiments. I will show that CMB and other cosmological dataset favors strong flavor specific neutrino self-interaction. I will talk about the feasibility of addressing the Hubble tension in this framework. In this context, I will briefly discuss another avenue to alleviate the Hubble tension by introducing additional dark radiation species having isocurvature primordial perturbation. I will show that cosmological data prefers a blue-tilt of the dark radiation isocurvature spectrum which gives rise to a larger value of the Hubble constant.

Primary authors

Subhajit Ghosh (University of Notre Dame) Dr Anirban Das (SLAC)

Presentation Materials

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