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30 May 2022 to 4 June 2022
Virtual Seoul
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Gravitational CMB lensing illuminates neutrino interactions

Not scheduled
Virtual Seoul

Virtual Seoul

Poster Neutrinos and cosmology Poster


Ivan Esteban (CCAPP, Ohio State University)


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)


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

Presentation Materials