Neutral bions in the CPN-1 model for resurgence

30th International Colloquium on Group Theoretical Methods in Physics

Misumi, Tatsuhiro^1 ; Nitta, Muneto^1 ; Sakai, Norisuke^1

Department of Physics, Research and Education Center for Natural Sciences, Keio University, Hiyoshi 4-1-1, Kanagawa, Yokohama

223-8521, Japan^1

关键词: Attractive interactions;    Field equation;    In-field;    Instantons;    Twisted boundary conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/597/1/012060/pdf
DOI  :  10.1088/1742-6596/597/1/012060

来源: IOP

【 摘 要 】

Classical configurations in the CPN-1model on R1X S1is studied with twisted boundary conditions. Starting from fractional instantons with the ZNtwisted boundary conditions, we review briefly the relevance of our study to resurgence phenomenon in field theory. We consider primarily configurations composed of multiple fractional instantons, called "neutral bions", which are identified as "perturbative infrared renormalons". We construct an explicit ansatz corresponding to topologically trivial configurations containing one fractional instanton (v = 1/N) and one fractional anti-instanton (v = -1/N), which is guaranteed to become a solution of field equations asymptotically for large separations. The attractive interactions between the instanton constituents from small to large separations are found to be consistent with the standard separated-instanton calculus. Our results suggest that the ansatz enables us to study bions and the related physics for a wide range of separations. This talk is mainly based on our recent work published in JHEP 1406, 164 (2014) [arXiv:1404.7225 [hep-th]].