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SEQUENCE:1
UID:UW-Physics-Event-6109
DTSTART:20201002T190000Z
DTEND:20201002T200000Z
DTSTAMP:20260415T003621Z
LAST-MODIFIED:20200924T140027Z
LOCATION:For zoom link\, sign up at: https://groups.google.com/a/g-gro
 ups.wisc.edu/d/forum/theoryseminars/join
SUMMARY:Gradient effects on false vacuum decay in gauge theory \, Theo
 ry Seminar (High Energy/Cosmology)\, Juan S. Cruz\, Technical Universi
 ty Munich
DESCRIPTION:We study false vacuum decay for a gauged complex scalar fi
 eld in a polynomial potential with nearly degenerate minima. Radiative
  corrections to the profile of the nucleated bubble as well as the ful
 l decay rate are computed in the planar thin-wall approximation using 
 the effective action. This allows to account for the inhomogeneity of 
 the bounce background and the radiative corrections in a self-consiste
 nt manner. In contrast to scalar or fermion loops\, for gauge fields o
 ne must deal with a coupled system that mixes the Goldstone boson and 
 the gauge fields\, which considerably complicates the numerical calcul
 ation of Green's functions. In addition to the renormalization of coup
 lings\, we employ a covariant gradient expansion in order to systemati
 cally construct the counterterm for the wave-function renormalization.
  The result for the full decay rate however does not rely on such an e
 xpansion and accounts for all gradient corrections at the chosen trunc
 ation of the loop expansion. The ensuing gradient effects are shown to
  be of the same order of magnitude as non-derivative one-loop correcti
 ons.
URL:https://www.physics.wisc.edu/events/?id=6109
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