Preprint/Report

PUBDB-2018-05563

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A Fresh Look at the Calculation of Tunneling Actions in Multi-Field Potentials

Espinosa, J. R. ; Konstandin, T. (Corresponding author)DESY*

2018

This record in other databases:    

Please use a persistent id in citations: doi:10.3204/PUBDB-2018-05563

Report No.: CERN-TH-2018-245; DESY-18-206; arXiv:1811.09185

Abstract: 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.

Keyword(s): action: Euclidean ; field theory: scalar ; tunneling ; bounce ; numerical calculations ; boundary condition ; suppression

---

Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2018

---

Database coverage:
; ; Published

---

---

Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Report/Journal Article Espinosa, J. R. ; Konstandin, T. (Corresponding author)DESY*
A fresh look at the calculation of tunneling actions in multi-field potentials
Journal of cosmology and astroparticle physics 1901(01), 051 (2019) [10.1088/1475-7516/2019/01/051]2019     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

---