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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-8057
DTSTART:20230310T213000Z
DTEND:20230310T223000Z
DTSTAMP:20260414T054238Z
LAST-MODIFIED:20230202T163911Z
LOCATION:Chamberlin 2241
SUMMARY:Imprints of the Quantum Physics on the Universe\, Physics Depa
 rtment Colloquium\, Jun'ichi Yokoyama\, University of Tokyo
DESCRIPTION:Our Universe is big\, old\, and full of structures.  All o
 f them are big mysteries in the classical Big Bang Cosmology.  Inflati
 onary cosmology\, which postulates accelerated expansion in the early 
 Universe\, explain all of them.  Inflation is driven by a quantum fiel
 d\, whose quantum fluctuations are stretched to fill the entire Univer
 se.  Their trace is observed in the Cosmic Microwave Background (CMB)\
 , and they also yield density fluctuations to form galaxies etc.  Furt
 hermore\, where the fluctuations were large\, they may have formed pri
 mordial black holes and may have been the origin of the black holes fo
 und by LIGO and Virgo.  We have calculated not only the lowest-order p
 erturbations\, but also the loop effects\, and found that the distribu
 tion of fluctuations must be highly Gaussian\, and that the formation 
 of primordial black holes would be inconsistent with the CMB.
URL:https://www.physics.wisc.edu/events/?id=8057
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