Geometric quantization and the metric dependence of the self-dual field theory

TL;DR

This paper explores how the partition function of the self-dual p-form gauge field depends on the metric of a Riemannian manifold, linking it to geometric quantization and the Cheeger half-torsion, and relates it to anomalies and string theory models.

Contribution

It introduces a geometric quantization approach to analyze metric dependence and connects the partition function to Cheeger half-torsion, providing new insights into anomalies and string theory applications.

Findings

Derived a projectively flat connection governing metric dependence.

Linked the metric dependence to Cheeger half-torsion.

Showed the one-loop determinant of the (2,0) multiplet matches the B-model.

Abstract

We investigate the metric dependence of the partition function of the self-dual p-form gauge field on an arbitrary Riemannian manifold. Using geometric quantization of the space of middle-dimensional forms, we derive a projectively flat connection on its space of polarizations. This connection governs metric dependence of the partition function of the self-dual field. We show that the dependence is essentially given by the Cheeger half-torsion of the underlying manifold. We compute the local gravitational anomaly and show how our derivation relates to the classical computation based on index theory. As an application, we show that the one-loop determinant of the (2,0) multiplet on a Calabi-Yau threefold coincides with the square root of the one-loop determinant of the B-model.