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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:3
UID:UW-Physics-Event-9349
DTSTART:20251010T160000Z
DTEND:20251010T173000Z
DTSTAMP:20260413T084213Z
LAST-MODIFIED:20251012T085429Z
LOCATION:Chamberlin 5280
SUMMARY:Quantum Gravity Fluctuations in Causal Diamonds and Cosmology\
 , Theory Seminar (High Energy/Cosmology)\, Lars Aalsma\, Minnesota U.\
 , Duluth
DESCRIPTION:Given that the Planck length is 10^{-35} meters\, directly
  measuring quantum gravity effects does not seem feasible. For this re
 ason\, finding physical systems where quantum fluctuations are enhance
 d is crucial to put theoretical ideas about quantum gravity to the tes
 t. Work by Verlinde and Zurek in 2019 has suggested that an enhancemen
 t of geometrical fluctuations takes place in a ‘causal diamond’: t
 he causally accessible region to an observer in a finite time interval
 . This has been dubbed the ‘VZ-effect’. If correct\, this leads to
  a quantum gravitational background noise that can be measured by futu
 re dedicated interferometry experiments. In this talk\, I will explain
  the status of this proposal and highlight some of its controversial a
 spects. To address these controversies\, I will show that the fluctuat
 ions proposed by VZ have a natural interpretation in inflationary cosm
 ology. This clarifies the assumptions that need to be satisfied for th
 e ‘VZ-effect' to be observable. Event recording: https://youtu.be/Lw
 I9dPKhUco
URL:https://www.physics.wisc.edu/events/?id=9349
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