Genus One Partition Function of the Calabi-Yau d-Fold embedded in ${CP^{d+1}}$

TL;DR

This paper introduces a new quasi-topological field theory for Calabi-Yau d-folds, derives a non-affine Toda equation for correlators, and computes genus one partition functions using the holomorphic anomaly.

Contribution

It develops the ${A^{ ext{*}}}$-model, analyzes its correlators via $A{A^{ ext{*}}}$-fusion, and derives genus one partition functions for Calabi-Yau d-folds embedded in projective space.

Findings

Derivation of a non-affine A-type Toda equation for the model

Calculation of genus one partition functions using holomorphic anomaly

Identification of correlator equations related to the vanishing first Chern class

Abstract

For a one-parameter family of Calabi-Yau d-fold M embedded in ${{CP}^{d+1}}$, we consider a new quasi-topological field theory ${A^{\ast}}$(M)-model compared with the $A$(M)-model. The two point correlators on the sigma model moduli space (the hermitian metrics) are analyzed by the $A{A^{\ast}}$-fusion on the world sheet sphere. A set of equations of these correlators turns out to be a non-affine A-type Toda equation system for the d-fold M. This non-affine property originates in the vanishing first Chern class of M. Using the results of the $A{A^{\ast}}$-equation, we obtain a genus one partition function of the sigma model associated to the M in the recipe of the holomorphic anomaly. By taking an asymmetrical limit of the complexified {\kae} parameters ${\bar{t}\rightarrow \infty}$ and $t$ is fixed, the ${A^{\ast}}$(M)-model part is decoupled and we can obtain a partition function (or one point function of the operator ${{\cal O}^{(1)}}$ associated to a {\kae} form of M) of the $A$(M)-matter coupled with the topological gravity at the stringy one loop level. The coefficients of the series expansion with respect to an indeterminate $q:={e^{2\pi i t}}$ are integrals of the top Chern class of the vector bundle {\Large $\nu $} over the moduli space of stable maps with definite degrees.