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Neutrinos and Other Dark Lights: Cosmological Constraints

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If you have a question about this talk, please contact Ben Davies .

A number of lines of evidence, both laboratory and astrophysical, suggest that there are extra (sterile) neutrino species, or otherwise extra light and dark degrees of freedom (‘dark lights’) than exist in the standard model of particle physics. I will review the physical origin of cosmological constraints on $N_{\rm eff}$ which is the energy density in dark lights expressed in units of the contribution from one active and massless neutrino species. I will also review the current constraints from light element abundances, high-resolution cosmic microwave background data, distance vs. redshift measurements, and galaxy cluster abundances.

This talk is part of the Institute of Astronomy Seminars series.

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LCHES Seminar Room, Henry Wellcome Buildingm Fitzwilliam Street Webinar & LT1, Computer Laboratory, William Gates Building. Average on weekdays: 9014.51346801 kWh

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