Pseudo-bounces vs. new instantons - INSPIRE

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Pseudo-bounces vs. new instantons

J.R. Espinosa
(
- Madrid, IFT
)
,
J. Huertas
(
- Madrid, IFT
)

Jun 8, 2021

24 pages

Published in:

JCAP 12 (2021) 12, 029

Published: Dec 13, 2021

e-Print:

2106.04541 [hep-th]

DOI:

10.1088/1475-7516/2021/12/029

View in:

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Abstract: (IOP)

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 a decay rate that can be lower than the one via new instantons by orders of magnitude.

cosmological phase transitions
particle physics - cosmology connection
instanton
bounce
perturbation
flat direction
false vacuum
tunneling
invariance: scale
potential: scalar

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