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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-6897
DTSTART:20220325T180000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T144220Z
LAST-MODIFIED:20220321T213005Z
LOCATION:Chamberlin 5280
SUMMARY:Wormholes and Saddles in Axion Gravity\, Theory Seminar (High 
 Energy/Cosmology)\, Gregory Loges\, UW Madison
DESCRIPTION:The saddle-point approximation often used to make sense of
  path integrals is especially subtle when gravity is dynamical\, most 
 notably because of the conformal factor problem which renders the acti
 on unbounded below. In this talk I will discuss two aspects of saddle 
 points in axion gravity\, making use of the dual description in terms 
 of a 3-form flux: (i) how Picard-Lefschetz theory can be used to ident
 ify in a democratic way which Lorentzian\, complex and Euclidean saddl
 e points contribute to Lorentzian path integrals\, and (ii) the pertur
 bative stability of the Giddings-Strominger Euclidean wormhole. Based 
 on [2203.01956] with Gary Shiu and Nidhi Sudhir.
URL:https://www.physics.wisc.edu/events/?id=6897
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