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BSM PANDEMIC Seminars
BSM PANDEMIC seminar - Julian B. Muñoz (Harvard-Smithsonian Center for Astrophysics)
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America/New_York
Description
Julian B. Muñoz (Harvard-Smithsonian Center for Astrophysics)
Title: Exploring the universe at small scales and high redshifts with the 21-cm line
Abstract:
I will describe how to use the 21-cm line of hydrogen to learn about dark matter and the early-universe expansion history. I will begin with a brief overview of the physics that shape the 21-cm signal during cosmic dawn. Then, I will illustrate how the timing of this signal can be used to study DM at small scales, beyond our current reach, and how to use 21-cm data to determine whether DM is cold, warm, or self interacting. I will also show that the acoustic physics of recombination become imprinted onto the 21-cm fluctuations, which provides a new standard ruler during cosmic dawn, at z=15-20. This will bridge the gap in measurements of the expansion rate H(z) of our universe between the CMB and the local universe, and shed light on potential resolutions to the H0 tension.
