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SUMMARY:Learning Cosmology from the First Stars and Reionization - Julian 
 Munoz\, Harvard
DTSTART:20201026T150000Z
DTEND:20201026T160000Z
UID:TALK152728@talks.cam.ac.uk
CONTACT:David Stefanyszyn
DESCRIPTION:I will describe how to use current and upcoming astrophysical 
 measurements in the redshift range z=4-20 to learn new cosmological inform
 ation. I will first describe the 21-cm line during the cosmic-dawn era\, w
 hich saw the formation of the first stars. The radiation from these stars 
 excited neutral hydrogen and allowed it to absorb 21-cm photons from the c
 osmic microwave background (CMB). I will illustrate how the timing of this
  signal\, which is dictated by the formation of the small minihalos that h
 osted the first stars\, can be used to tightly constrain the small-scale b
 ehavior of dark matter\, and determine if it's cold\, warm\, or self inter
 acting. Then\, I will explain how the acoustic physics of recombination be
 come imprinted onto the 21-cm fluctuations\, resulting in robust velocity-
 induced acoustic oscillations (VAOs) in the expected signal. These act as 
 a new standard ruler during cosmic dawn\, bridging the gap in measurements
  of the expansion rate of our universe between us and the CMB\, which are 
 presently at tension with each other. Finally\, I will show how current me
 asurements of UV luminosity functions during reionization can be used to p
 robe primordial non-Gaussianity at smaller scales than accessible by the C
 MB.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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