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• W1569861476 abstract "The work proposes a finite temperature theory of the quantum tunneling in a bistable quartic potential. In semiclassical approximation, the imaginary time path integral method identifies the classical background which interpolates between the potential minima and, at any T, consistently fulfills antiperiodic boundary conditions. Solving the boundary problem I find that the change between the low T quantum regime and the high T activated regime exhibits the signatures of a first order phase transition. This is confirmed by the discontinuity in the first temperature derivative of the instantonic action. The quantum fluctuation contribution around the (anti)instantons is evaluated by the functional determinant method. The computation of the tunneling energy shows (i) a remarkable reduction at low T with respect to the predictions of the infinite size canonical instantonic approach, and (ii) a steplike increase at the transition point." @default.
• W1569861476 created "2016-06-24" @default.
• W1569861476 creator A5045132467 @default.
• W1569861476 date "2007-01-01" @default.
• W1569861476 modified "2023-10-16" @default.
• W1569861476 title "Finite size effects in bistable ϕ4 models" @default.
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• W1569861476 doi "https://doi.org/10.1063/1.2435601" @default.
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