Seminar detail: Neff from the dilution-resistant effect

Date&Time	Wed Nov 13 2024 (13:00 - 14:00)
Speaker	Shaoping Li
Affiliation	Osaka University
Title	Neff from the dilution-resistant effect
Abstract	The effective neutrino number is a key observable characterizing the expansion of the early universe, which can be measured by big-bang nucleosynthesis and cosmic microwave background physics. In this talk, I will introduce this important parameter and discuss the dilution-resistant effect caused by new physics coupling to neutrinos. Constraints and detection of this dilution-resistant effect will be shown. As an interesting consequence, I will show a cosmic sandwiched window of the lepton-number breaking scale.
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