TY  - JOUR
AU  - Espinosa, J. R.
AU  - Konstandin, T.
TI  - A fresh look at the calculation of tunneling actions in multi-field potentials
JO  - Journal of cosmology and astroparticle physics
VL  - 1901
IS  - 01
SN  - 1475-7516
CY  - London
PB  - IOP
M1  - PUBDB-2019-00951
M1  - arXiv:1811.09185
M1  - DESY-18-206
M1  - CERN-TH-2018-245
SP  - 051
PY  - 2019
N1  - (c) IOP Publishing Ltd and Sissa Medialab
AB  - The quantum decay of a metastable vacuum is exponentially suppressed by a tunneling action that can be calculated in the semi-classical approximation as the Euclidean action of a bounce that interpolates between the false and true phases. For multi-field potentials, finding the bounce is non-trivial due to its peculiar boundary conditions and the fact that the action at the bounce is not a minimum but merely a saddle point. Recently, an alternative tunneling action has been proposed that does not rely on Euclidean bounces and reproduces the standard result at its minimum. Here we generalize this new approach for several scalar fields and demonstrate how its use can significantly improve the numerical calculation of tunneling actions for multi-field potentials.
LB  - PUB:(DE-HGF)29 ; PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000457103000001
DO  - DOI:10.1088/1475-7516/2019/01/051
UR  - https://bib-pubdb1.desy.de/record/419168
ER  -