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Monday, 2 June 2025, 15:00 in P8445B
Helena Garcia Escudero (UC Irvine)
Beyond the Comfort of 螞CDM: Massive neutrinos, extra neutrinos, and other surprises in cosmology
Recent theoretical and observational insights suggest that the six-parameter 螞CDM model may no longer adequately describe cosmology. While datasets such as CMB anisotropies, BAO, type Ia supernovae, and large-scale structure generally align with 螞CDM, they often favor conflicting parameter spaces. Laboratory experiments confirm that neutrinos have mass, affecting cosmological observations through their gravitational effects. Furthermore, the Hubble tension remains a significant challenge to standard 螞CDM. This tension arises from discrepancies in the Hubble parameter values, derived either indirectly and model-dependently from the angular scale of standard rulers or more directly from the brightness of standard candles. In this talk, I will review the impact of neutrinos in cosmology, the current constraints on their mass hierarchy, and their role as a potential source of additional radiation. I will also address the subtle but persistent negative neutrino mass anomaly and its implications for model extensions beyond 螞CDM. Finally, assuming the Hubble tension is real, I will confirm that additional radiation density, possibly from neutrinos, could alleviate this tension.
Seminars in 2024:
2025-01-22 15:30 in P8445A - Kazuya Koyama (ICG, Porstmouth): Theory activities in Euclid 2025-01-24 14:30 in BLU9660 - Dragan Huterer (Michigan): Cosmological results from DESI (physics colloquium) 2025-03-12 15:30 in P8445B - Yukari Uchibori (UBC): The quest to capture dark energy 2025-03-19 15:30 in P8445A - David Miller (UBC): Probing stellar evolution with the white dwarf initial-final mass relation 2025-06-02 15:00 in P8445B - Helena Garcia Escudero (UC Irvine): Beyond the Comfort of 螞CDM: Massive neutrinos, extra neutrinos, and other surprises in cosmology
[ See complete seminar archives | iCal feed ]
Modified by Andrei Frolov <frolov@sfu.ca> on 2026-10-27