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SUMMARY:Gauge-independence of tunneling rates (15' + 5')
DTSTART;VALUE=DATE-TIME:20160806T142000Z
DTEND;VALUE=DATE-TIME:20160806T144000Z
DTSTAMP;VALUE=DATE-TIME:20201031T031440Z
UID:indico-contribution-1071598@indico.cern.ch
DESCRIPTION:Speakers: Carlos Tamarit (IPPP Durham)\nDespite the gauge depe
ndence of the effective action at zero and finite temperature\, it is show
n that it leads to tunneling and nucleation rates that remain independent
of the choice of gauge-fixing. Taking as a starting point the path integra
l that defines the transition amplitude from a false vacuum to itself\, a
careful treatment of the boundary conditions and the gauge-fixing allows t
o show that decay rates are exactly determined by the effective action ev
aluated at a generalized bounce configuration. The latter is a solution to
the quantum equations of motion\, with\nboundary conditions fixed by the
false vacuum. The resulting tunneling rate is gauge-independent\, as the
Nielsen identities imply that the explicit gauge dependence in the effecti
ve action is exactly cancelled by the gauge dependence of the solution. Th
is \nholds for any election of gauge-fixing that leads to an invertible F
addeev-Popov matrix. The result is nonperturbative and model-independent\,
and also clarifies how to incorporate\nradiative corrections in tunneling
calculations.\n\nhttps://indico.cern.ch/event/432527/contributions/107159
8/
LOCATION: Superior A
URL:https://indico.cern.ch/event/432527/contributions/1071598/
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