Instanton Bound States in ABJM Theory

TL;DR

This paper analyzes non-perturbative instanton effects in ABJM theory, revealing how bound states of instantons contribute to the partition function and proposing a unified framework for their effects.

Contribution

It introduces a pole cancellation mechanism to determine bound state contributions and provides a conjecture for their general expression in ABJM theory.

Findings

Bound state contributions can be incorporated via a redefinition of the chemical potential.

Explicit expressions for 3- and 4-membrane instanton corrections are proposed.

The pole cancellation mechanism ensures finiteness of the total non-perturbative correction.

Abstract

The partition function of the ABJM theory receives non-perturbative corrections due to instanton effects. We study these non-perturbative corrections, including bound states of worldsheet instantons and membrane instantons, in the Fermi-gas approach. We require that the total non-perturbative correction should be always finite for arbitrary Chern-Simons level. This finiteness is realized quite non-trivially because each bound state contribution naively diverges at some levels. The poles of each contribution should be canceled out in total. We use this pole cancellation mechanism to find unknown bound state corrections from known ones. We conjecture a general expression of the bound state contribution. Summing up all the bound state contributions, we find that the effect of bound states is simply incorporated into the worldsheet instanton correction by a redefinition of the chemical potential in the Fermi-gas system. Analytic expressions of the 3- and 4-membrane instanton corrections are also proposed.