Imprints of Ultralight Scalars across Cosmological History
Imprints of Ultralight Scalars across Cosmological History
Pacific
Speaker(s) Tien-Tien Yu (University of Oregon)
Description
Please contact divya.singh@berkeley.edu, tianqi.zhao@berkeley.edu, or klund@berkeley.edu for zoom links.
Ultralight scalar fields present a compelling dark matter candidate that can imprint potential signatures on early-universe observables. In this talk, I will explore the cosmological implications of scalar dark matter that couples quadratically to the Standard Model. Such couplings induce temporal variations in the fundamental constants, leading to measurable effects on Big Bang Nucleosynthesis and the Cosmic Microwave Background. I will discuss how these changes influence the light element abundances and the CMB power spectrum, and how current cosmological data constrain this class of dark matter models.
Files
