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000417371 0247_ $$2arXiv$$aarXiv:1811.09185
000417371 0247_ $$2datacite_doi$$a10.3204/PUBDB-2018-05563
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000417371 0881_ $$aarXiv:1811.09185; DESY-18-206; CERN-TH-2018-245
000417371 088__ $$2arXiv$$aarXiv:1811.09185
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000417371 1001_ $$aEspinosa, J. R.$$b0
000417371 245__ $$aA Fresh Look at the Calculation of Tunneling Actions in Multi-Field Potentials
000417371 260__ $$c2018
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000417371 520__ $$aThe 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.
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000417371 650_7 $$2INSPIRE$$aaction: Euclidean
000417371 650_7 $$2INSPIRE$$afield theory: scalar
000417371 650_7 $$2INSPIRE$$atunneling
000417371 650_7 $$2INSPIRE$$abounce
000417371 650_7 $$2INSPIRE$$anumerical calculations
000417371 650_7 $$2INSPIRE$$aboundary condition
000417371 650_7 $$2INSPIRE$$asuppression
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000417371 7001_ $$0P:(DE-H253)PIP1015746$$aKonstandin, T.$$b1$$eCorresponding author
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