Bosonic Ghost Correlators: A Case Study

TL;DR

This paper investigates the correlation functions of the bosonic ghost system in logarithmic conformal field theories, revealing unexpected logarithmic singularities through differential equations analysis.

Contribution

It provides the first analytic study showing four-point functions with logarithmic singularities in the bosonic ghost model, expanding understanding of these theories.

Findings

Four-point functions exhibit logarithmic singularities.

Correlation functions are richer than expected for a free-field theory.

Differential equations reveal complex analytic structure.

Abstract

There has been a lot of recent work addressing the representation theory that underlies logarithmic conformal field theories. A full understanding of these models will however also need analytic data, in particular the correlation functions. Here, we explore the correlators of one of the most fundamental of all logarithmic models: the bosonic ghost system. In this first part, we use differential equations to show that the correlation functions exhibit a richness beyond what one might have expected, given the free-field nature of the theory. Our main result is the verification that there are four-point functions with logarithmic singularities. In a sequel, we will employ Coulomb gas and bootstrap methods to further refine the results presented here.