Cosmological Measurements of Neutrinos and other Massive Light Relics

Cosmological Measurements of Neutrinos and other Massive Light Relics
Linda Xu, Harvard
Date and time: Tue, Apr 13, 2021 - 2:30pm
Location: Zoom only
Category: ACFI Seminar
Abstract:

An intriguing possibility for the particle makeup of the dark sector is that a small fraction of the observed abundance is made up of light, feebly-interacting particle species.  Neutrinos, with their yet-unresolved masses, are a concrete example in this category, and new light relics arise ubiquitously in particle theories as well. Due to their weakness of interaction but comparatively large number abundance, cosmological datasets are particularly powerful tools to leverage here. In this talk I discuss the impact of these new particle species on observables, the CMB and LSS in particular, and the power of present and near-future galaxy surveys to detect or constrain them.