# Fixing an Ambiguity in Two Dimensional String Theory Using String Field Theory

## TL;DR

This paper resolves an ambiguity in two-dimensional string theory by employing string field theory to fix a previously undetermined constant, enhancing the consistency between world-sheet and matrix model results.

## Contribution

It introduces a string field theory reformulation to determine an undetermined constant in D-instanton corrections, clarifying the theoretical framework.

## Key findings

- Fixed the undetermined constant in string theory calculations
- Reconciled world-sheet analysis with matrix model results
- Enhanced understanding of D-instanton effects in 2D string theory

## Abstract

In a recent paper, Balthazar, Rodriguez and Yin found some remarkable agreement between the results of c=1 matrix model and D-instanton corrections in two dimensional string theory. Their analysis left undetermined two constants in the string theory computation which had to be fixed by comparing the results with the matrix model results. One of these constants is affected by possible renormalization of the D-instanton action that needs to be computed separately. In this paper we fix the other constant by reformulating the world-sheet analysis in the language of string field theory.