Modular Forms as Classification Invariants of 4D N=2 Heterotic--IIA Dual Vacua

Yuichi Enoki, Taizan Watari

We focus on 4D $\mathcal{N}=2$ string vacua described both by perturbative Heterotic theory and by Type IIA theory; a Calabi--Yau three-fold $X_{\mathrm{IIA}}$ in the Type IIA language…