Counting BPS states on the Enriques Calabi-Yau

TL;DR

This paper analyzes topological string amplitudes on the Enriques Calabi-Yau, revealing dual methods for computing BPS states and providing explicit formulas up to genus four, indicating potential exact solvability.

Contribution

It introduces dual computational approaches for topological amplitudes on the Enriques Calabi-Yau and derives explicit modular form expressions up to genus four.

Findings

Two methods yield different BPS spectra for the model.

Explicit topological amplitude formulas up to genus four.

Verification of heterotic results using mirror symmetry.

Abstract

We study topological string amplitudes for the FHSV model using various techniques. This model has a type II realization involving a Calabi-Yau threefold with Enriques fibres, which we call the Enriques Calabi-Yau. By applying heterotic/type IIA duality, we compute the topological amplitudes in the fibre to all genera. It turns out that there are two different ways to do the computation that lead to topological couplings with different BPS content. One of them leads to the standard D0-D2 counting amplitudes, and from the other one we obtain information about bound states of D0-D4-D2 branes on the Enriques fibre. We also study the model using mirror symmetry and the holomorphic anomaly equations. We verify in this way the heterotic results for the D0-D2 generating functional for low genera and find closed expressions for the topological amplitudes on the total space in terms of modular forms, and up to genus four. This model turns out to be much simpler than the generic B-model and might be exactly solvable.