Toric Varieties with NC Toric Actions: NC Type IIA Geometry

TL;DR

This paper develops a framework for non-commutative toric varieties with extended toric actions, constructs NC Calabi-Yau manifolds within them, and explores fractional D-branes and quiver diagrams, broadening the understanding of NC geometry in string theory.

Contribution

It introduces a new class of NC toric varieties with asymmetric $ extbf{C}^{ imes r}$ actions and constructs associated NC Calabi-Yau manifolds, including their fractional D-branes and quiver diagrams.

Findings

Constructed NC toric varieties with asymmetric toric actions.

Derived equations and solutions for NC Calabi-Yau backgrounds.

Analyzed fractional D-branes and provided generalized quiver diagrams.

Abstract

Extending the usual $\mathbf{C}^{\ast r}$ actions of toric manifolds by allowing asymmetries between the various $\mathbf{C}^{\ast}$ factors, we build a class of non commutative (NC) toric varieties $\mathcal{V}%_{d+1}^{(nc)}$. We construct NC complex $d$ dimension Calabi-Yau manifolds embedded in $\mathcal{V}_{d+1}^{(nc)}$ by using the algebraic geometry method. Realizations of NC $\mathbf{C}^{\ast r}$ toric group are given in presence and absence of quantum symmetries and for both cases of discrete or continuous spectrums. We also derive the constraint eqs for NC Calabi-Yau backgrounds $\mathcal{M}_{d}^{nc}$ embedded in $\mathcal{V}_{d+1}^{nc}$ and work out their solutions. The latters depend on the Calabi-Yau condition $% \sum_{i}q_{i}^{a}=0$, $q_{i}^{a}$ being the charges of $\mathbf{C}^{\ast r}$% ; but also on the toric data ${q_{i}^{a},\nu_{i}^{A};p_{I}^{\alpha},\nu _{iA}^{\ast}} $ of the polygons associated to $\mathcal{V}%_{d+1}$. Moreover, we study fractional $D$ branes at singularities and show that, due to the complete reducibility property of $\mathbf{C}^{\ast r}$ group representations, there is an infinite number of fractional $D$ branes. We also give the generalized Berenstein and Leigh quiver diagrams for discrete and continuous $\mathbf{C}^{\ast r}$ representation spectrums. An illustrating example is presented.