Vacuum decay in multidimensional field landscapes: thin, thick and intersecting walls

Details Vacuum decay in multidimensional field landscapes: thin, thick and intersecting walls Vacuum decay in multidimensional field landscapes: thin, thick and intersecting walls

2010-12-09

arxiv.org/abs/1012.2065v2

Phys.Rev.D84:025019,2011

Physics

High Energy Physics

High Energy Physics - Theory

14 pages. Published version

Scientific paper

10.1103/PhysRevD.84.025019

We study tunneling between vacua in multi-dimensional field spaces. Working in the strict thin wall approximation, we find that the conventional instantons for false vacuum decay develop a new vanishing eigenvalue in their fluctuation determinant, arising from decorations of the nucleating bubble wall with small spots of the additional vacua. Naively, this would suggest that the presence of additional vacua in field space leads to a substantial enhancement of the nucleation rate. However, we argue that this potential enhancement is regulated away by the finite thickness of physical bubble wall intersections. We then discuss novel saddle points of the thin wall action that, in some regimes of parameter space, have the potential to destabilize the conventional instantons for false vacuum decay.

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