Elliptic genera from multi-centers

TL;DR

This paper connects elliptic genera of Calabi-Yau threefolds to supergravity multi-center configurations, providing a method to enumerate contributions to the polar sector and advancing understanding of black hole microstates.

Contribution

It introduces a simple procedure to count multi-center configurations contributing to elliptic genera, verified in several Calabi-Yau examples, linking supergravity to enumerative invariants.

Findings

Verified enumeration method in multiple Calabi-Yau cases

Connected polar sector contributions to Donaldson-Thomas invariants

Progressed towards understanding black hole microstates in supergravity

Abstract

I show how elliptic genera for various Calabi-Yau threefolds may be understood from supergravity localization using the quantization of the phase space of certain multi-center configurations. I present a simple procedure that allows for the enumeration of all multi-center configurations contributing to the polar sector of the elliptic genera\textemdash explicitly verifying this in the cases of the quintic in $\mathbb{P}^4$, the sextic in $\mathbb{WP}_{(2,1,1,1,1)}$, the octic in $\mathbb{WP}_{(4,1,1,1,1)}$ and the dectic in $\mathbb{WP}_{(5,2,1,1,1)}$. With an input of the corresponding `single-center' indices (Donaldson-Thomas invariants), the polar terms have been known to determine the elliptic genera completely. I argue that this multi-center approach to the low-lying spectrum of the elliptic genera is a stepping stone towards an understanding of the exact microscopic states that contribute to supersymmetric single center black hole entropy in $\mathcal{N}=2$ supergravity.