String coupling and interactions in type IIB matrix model

TL;DR

This paper explores how closed strings interact in the type IIB matrix model, identifying the string coupling constant through recombination probabilities and confirming consistency with matrix string theory.

Contribution

It introduces a method to determine the string coupling in the IIB matrix model using recombination probabilities of intersecting strings.

Findings

Recombination of intersecting strings models closed string interactions.

The string coupling g_s is identified within the IIB matrix model.

Results are consistent with matrix string theory.

Abstract

We investigate the interactions of closed strings in IIB matrix model. The basic interaction of the closed superstring is realized by the recombination of two intersecting strings. Such interaction is investigated in IIB matrix model via two dimensional noncommutative gauge theory in the IR limit. By estimating the probability of the recombination, we identify the string coupling g_s in IIB matrix model. We confirm that our identification is consistent with matrix string theory.