The self-consistent bounce: an improved nucleation rate

Details The self-consistent bounce: an improved nucleation rate The self-consistent bounce: an improved nucleation rate

2003-08-10

arxiv.org/abs/hep-ph/0308107v2

Phys.Rev. D69 (2004) 045012

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, revtex, 7 eps figures

Scientific paper

10.1103/PhysRevD.69.045012

We generalize the standard computation of homogeneous nucleation theory at zero temperature to a scenario in which the bubble shape is determined self-consistently with its quantum fluctuations. Studying two scalar models in 1+1 dimensions, we find the self-consistent bounce by employing a two-particle irreducible (2PI) effective action in imaginary time at the level of the Hartree approximation. We thus obtain an effective single bounce action which determines the rate exponent. We use collective coordinates to account for the translational invariance and the growth instability of the bubble and finally present a new nucleation rate prefactor. We compare the results with those obtained using the standard 1-loop approximation and show that the self-consistent rate can differ by several orders of magnitude.

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