Supergravity Instantons and the Universal Hypermultiplet
Michael Gutperle (Harvard University), Michal Spalinski (Harvard, University)
TL;DR
This paper investigates non-perturbative instanton effects in 5D N=2 supergravity from M-theory compactifications, focusing on the universal hypermultiplet and deriving a generalized instanton action.
Contribution
It presents a new solution for instanton corrections in the universal hypermultiplet, extending previous membrane instanton results and revealing a bound state-like instanton action.
Findings
Derived a generalized instanton action for the universal hypermultiplet.
Showed the instanton action differs from a simple sum of membrane and fivebrane contributions.
Identified the instanton as a non-threshold bound state.
Abstract
The effective action of N=2 supersymmetric 5-dimensional supergravity arising from compactifications of M-theory on Calabi-Yau threefolds receives non-perturbative corrections from wrapped Euclidean membranes and fivebranes. These contributions can be interpreted as instanton corrections in the 5 dimensional field theory. Focusing on the universal hypermultiplet, a solution of this type is presented and the instanton action is calculated, generalizing previous results involving membrane instantons. The instanton action is not a sum of membrane and fivebrane contributions: it has the form reminiscent of non-threshold bound states.
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