# Orientifold Calabi-Yau threefolds with divisor involutions and string landscape

@article{Altman2021OrientifoldCT, title={Orientifold Calabi-Yau threefolds with divisor involutions and string landscape}, author={Ross Altman and Jonathan Carifio and Xin Gao and Brent Nelson}, journal={Journal of High Energy Physics}, year={2021}, volume={2022} }

We establish an orientifold Calabi-Yau threefold database for h1,1(X) ≤ 6 by considering non-trivial ℤ2 divisor exchange involutions, using a toric Calabi-Yau database (www.rossealtman.com/tcy). We first determine the topology for each individual divisor (Hodge diamond), then identify and classify the proper involutions which are globally consistent across all disjoint phases of the Kähler cone for each unique geometry. Each of the proper involutions will result in an orientifold Calabi-Yau…

## 13 Citations

### A database of Calabi-Yau orientifolds and the size of D3-tadpoles

- MathematicsJournal of High Energy Physics
- 2022

The classification of 4D reflexive polytopes by Kreuzer and Skarke allows for a systematic construction of Calabi-Yau hypersurfaces as fine, regular, star triangulations (FRSTs). Until now, the…

### On K3-fibred LARGE Volume Scenario with de Sitter vacua from anti-D3-branes

- Mathematics
- 2022

: In the context of type IIB superstring compactiﬁcations on K3-ﬁbred (weak) Swiss-cheese Calabi Yau (CY) orientifolds, we consider the realisation of de Sitter vacua obtained through the…

### Systematics of perturbatively flat flux vacua for CICYs

- Physics, MathematicsJournal of High Energy Physics
- 2022

In this paper, we extend the analysis of scanning the perturbatively flat flux vacua (PFFV) for the type IIB orientifold compactifications on the mirror of the projective complete intersection…

### Classifying divisor topologies for string phenomenology

- MathematicsJournal of High Energy Physics
- 2022

Abstract
In this article we present a pheno-inspired classification for the divisor topologies of the favorable Calabi Yau (CY) threefolds with 1 ≤ h1,1(CY) ≤ 5 arising from the four-dimensional…

### Applying machine learning to the Calabi-Yau orientifolds with string vacua

- MathematicsPhysical Review D
- 2022

We use machine learning technique to search the polytope which can result in an orientifold Calabi-Yau hypersurface and the “naive Type IIB string vacua”. We show that neural networks can be trained…

### Topological constraints in the LARGE-volume scenario

- MathematicsJournal of High Energy Physics
- 2022

We elaborate on recent results regarding the self-consistency of de Sitter vacua in the LARGE-volume scenario of type IIB string theory. In particular, we analyze to what extent the control over…

### The LVS parametric tadpole constraint

- Computer ScienceJournal of High Energy Physics
- 2022

A simple and explicit formula is provided for what this tadpole has to be in order to control the most dangerous corrections in the large volume scenario (LVS) for de Sitter compactifications of the type IIB string.

### Machine Learning on generalized Complete Intersection Calabi-Yau Manifolds

- Computer Science, MathematicsArXiv
- 2022

The trained models can achieve a 97% precision in predicting new gCICY which is generated diﬁerently from those used for training and testing, showing that machine learning could be an eﬀective method to classify and generate new g CICY.

### Topological constraints in the LARGE-volume scenario

- Materials ScienceJournal of High Energy Physics
- 2022

We elaborate on recent results regarding the self-consistency of de Sitter vacua in the LARGE-volume scenario of type IIB string theory. In particular, we analyze to what extent the control over…

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