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30 May 2022 to 4 June 2022
Virtual Seoul
Asia/Seoul timezone

Gravitational CMB lensing illuminates neutrino interactions

Not scheduled
5m
Virtual Seoul

Virtual Seoul

Poster Neutrinos and cosmology Poster

Speaker

Ivan Esteban (CCAPP, Ohio State University)

Description

Next-generation Cosmic Microwave Background observations will scrutinize how it is lensed by the matter in the Universe, determined to see a signature of neutrino mass. Here, we show that this lensing pattern also contains rich information on neutrino interactions: new neutrino interactions would modify the neutrino equation of state at different redshifts, shaping the late-time energy density in neutrinos to which lensing is sensitive. Intriguingly, the so-called lensing anomaly (the Planck satellite observes stronger CMB gravitational lensing than expected at ~3σ) could be explained by yet-undiscovered neutrino long-range interactions.
Our results thus open up a window to link anomalous CMB lensing with present and future cosmological, astrophysical, and laboratory measurements of neutrino properties.

Primary author

Ivan Esteban (CCAPP, Ohio State University)

Co-authors

Dr Olga Mena (IFIC, Valencia University) Dr Jordi Salvado (Institute of Cosmos Sciences, University of Barcelona)

Presentation Materials