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Pseudo-Bounces vs. New Instantons
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Some false vacua do not decay via bounces. This usually happens when a flat direction of the tunneling action due to scale invariance is lifted to a sloping valley by a scale breaking perturbation, pushing the bounce off to infinity. We compare two types of alternative decay configurations that have been proposed recently to describe decay in such cases: pseudo-bounces and new instantons. Although both field configurations are quite similar, we find that the pseudo-bounce action is lower than the new instanton one and describes more faithfully the bottom of the action valley. In addition, pseudo-bounces cover a range of field space wider than new instantons and, as a result, lead to an action that can be lower than the one for new instantons by orders of magnitude.
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Cited by 1 Pith paper
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A Unified View of Vacuum Decay Channels
The Coleman-de Luccia bounce is part of a continuous family of tunneling-potential solutions that unifies Hawking-Moss, pseudo-bounce, and bubble-of-nothing decay channels.
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