Gauge-independence of tunneling rates
February 06, 2017
April 19, 2017
It is shown that tunneling rates can be defined in terms of a false-vacuum effective action whose reality and convexity properties differ from those of the corresponding groundstate functional. The tunneling
rate is directly related to the false-vacuum effective action evaluated at an extremal ``quantum bounce''. The Nielsen identities of the false-vacuum functional ensure that the rate remains
independent of the choice of gauge-fixing. Our results are nonperturbative and clarify issues related with convexity and radiative corrections.
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