Journal
PHYSICAL REVIEW D
Volume 99, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.99.056020
Keywords
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Funding
- Slovenian Research Agency [PR-07582, P1-0035, J1-8137]
- H2020 CSA Twinning Project [692194]
- COST action Connecting insights in fundamental physics [CA15108]
- COST action Unraveling new physics at the LHC through the precision frontier [CA16201]
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We propose a new approach for computing tunneling rates in quantum or thermal field theory with multiple scalar fields. It is based on exact analytical solutions of piecewise linear potentials with many segments that describes any given potential to arbitrary precision. The method is first developed for the single field case in three and four space-time dimensions and demonstrated on examples of classical potentials as well as the calculation of quantum fluctuations. A systematic expansion of the potential beyond the linear order is considered, taking into account higher order corrections, which paves the way for multiple scalar fields. We thereby provide a fast semianalytical tool for evaluating the bounce action for theories with an extended scalar sector.
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