BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3115
DTSTART:20131029T210000Z
DURATION:PT1H0M0S
DTSTAMP:20240329T121257Z
LAST-MODIFIED:20131001T180338Z
LOCATION:Chamberlin 5280
SUMMARY:A second look at the string theory landscape \, Theory Seminar
(High Energy/Cosmology)\, Thomas Van Riet\, University of Leuven
DESCRIPTION:I will review in a pedagogical manner the vanilla models (
KKLT) that have lead to the conjecture of a string theory &\;quot\;
landscape&\;quot\; of meta-stable de Sitter vacua. A central role i
s played by the so called uplifting anti-branes that break the supersy
mmetry of the AdS vacua and lift the cosmological constant to a positi
ve value. In the last years it has become clear that the supergravity
description of this process reveals problematic features such as unwan
ted singularities. Although this is a technical topic I will review it
in a non technical fashion with an emphasis on the physics behind it.
I will advocate the point of view that these singularities are easy t
o interpret and signal the instability of the vacuum. If correct this
invalidates the original motivation for the landscape conjecture.<\;
br>\;
\n
URL:https://www.physics.wisc.edu/events/?id=3115
END:VEVENT
END:VCALENDAR