# Calabi-Yau 4-folds of Borcea--Voisin type from F-Theory

## TL;DR

This paper constructs new Calabi-Yau fourfolds of Borcea--Voisin type with elliptic fibrations relevant for F-theory, providing explicit equations and examples that expand the known landscape of such geometries.

## Contribution

It introduces new Calabi-Yau fourfolds using Borcea--Voisin construction with specific elliptic fibrations relevant for F-theory models.

## Key findings

- New examples of Calabi-Yau fourfolds with elliptic fibrations over threefolds.
- Explicit equations for some of the constructed fourfolds.
- Identification of singular fibers of type I_5 over del Pezzo surfaces.

## Abstract

In this paper, we apply Borcea--Voisin's construction and give new examples of Calabi--Yau fourfolds $Y$, which admit an elliptic fibration onto a smooth threefold $V$, whose singular fibers of type $I_5$ lie above a del Pezzo surface $dP \subset V$. These are relevant models for F-theory according to papers by C. Beasley, J. J. Heckman, C. Vafa. Moreover, at the end of the paper we will give the explicit equations of some of these Calabi--Yau fourfolds and their fibrations.