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Mukhanov, V. F.; Rabinovici, E.; Sorin, A. S.
Fortschritte der Physik, February 2021, 2021-02-00, 20210201, Volume: 69, Issue: 2Journal Article
We study the fate of a false vacuum in the case of a potential that contains a portion which is quartic and unbounded. We first prove that an O(4) invariant instanton with the Coleman boundary conditions does not exist in this case. This, however, does not imply that the false vacuum does not decay. We show how the quantum fluctuations may regularize the singular classical solutions. This gives rise to a new class of O(4) invariant regularized instantons which describe the vacuum instability in the absence of the Coleman instanton. We derive the corresponding solutions and calculate the decay rate they induce. The authors study the fate of a false vacuum in the case of a potential that contains a portion which is quartic and unbounded. First they prove that an O(4) invariant instanton with the Coleman boundary conditions does not exist in this case. This, however, does not imply that the false vacuum does not decay. It will be shown how the quantum fluctuations may regularize the singular classical solutions. This gives rise to a new class of O(4) invariant regularized instantons which describe the vacuum instability in the absence of the Coleman instanton. What follows is both a derivation of the corresponding solutions and a calculation of the decay rate they induce.
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