The Case of the Disappearing Instanton

Details The Case of the Disappearing Instanton The Case of the Disappearing Instanton

2011-06-02

arxiv.org/abs/1106.0527v1

Physics

High Energy Physics

High Energy Physics - Theory

27 pages, 19 figures

Scientific paper

Instantons are tunneling solutions that connect two vacua, and under a small change in the potential, instantons sometimes disappear. We classify these disappearances as smooth (decay rate goes to 0 at disappearance) or abrupt (decay rate not equal to 0 at disappearance). Abrupt disappearances mean that a small change in the parameters can produce a drastic change in the physics, as some states become suddenly unreachable. The simplest abrupt disappearances are associated with annihilation by another Euclidean solution with higher action and one more negative mode; higher-order catastrophes can occur in cases of enhanced symmetry. We study a few simple examples, including the 6D Einstein-Maxwell theory, and give a unified account of instanton disappearances.

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