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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:4
UID:UW-Physics-Event-5212
DTSTART:20191113T220000Z
DTEND:20191113T230000Z
DTSTAMP:20261004T221433Z
LAST-MODIFIED:20191127T212847Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Deciphering the Archaeological Record: Cosmological Imprints o
 f Non-Minimal Dark Sectors\, Theory Seminar (High Energy/Cosmology)\, 
 Jeff Kost\, IBS-CTPU\; Daejeon\, Korea
DESCRIPTION:Many proposals for physics beyond the Standard Model give 
 rise to a non-minimal dark sector containing many degrees of freedom. 
 In this work\, we explore the cosmological implications of the non-tri
 vial dynamics which may arise within such dark sectors\, focusing on d
 ecay processes which take place entirely among the dark constituents. 
 First\, we demonstrate that such decays can leave dramatic imprints on
  the resulting dark-matter phase-space distribution. In particular\, t
 his phase-space distribution need not be thermal — it can even be mu
 lti-modal\, exhibiting a non-trivial pattern of peaks and troughs as a
  function of momentum. We then proceed to show how these features can 
 induce small-scale modifications to the matter power spectrum. Finally
 \, we assess the extent to which one can approach the archaeological �
 ��inverse” problem of deciphering the properties of an underlying da
 rk sector from the matter power spectrum. Indeed\, one of the main res
 ults in this talk is a remarkably simple conjectured analytic expressi
 on which allows us to reconstruct many of the important features of th
 e dark-matter phase-space distribution directly from the matter power 
 spectrum. Our results therefore provide an interesting way to learn ab
 out\, and potentially constrain\, the features of non-minimal dark sec
 tors and their dynamics in the early universe.
URL:https://www.physics.wisc.edu/events/?id=5212
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