Macroscopic entropy formulae and non-holomorphic corrections for supersymmetric black holes

TL;DR

This paper derives macroscopic entropy formulae for supersymmetric black holes in string theory, incorporating higher-derivative and non-holomorphic corrections to reconcile macroscopic and microscopic entropy calculations.

Contribution

It provides a method to include non-holomorphic corrections into entropy formulae, ensuring duality invariance and improving agreement with microscopic state counting.

Findings

Derived modified entropy formulae for heterotic and N=4 black holes

Incorporated non-holomorphic corrections for duality invariance

Enhanced agreement between macroscopic and microscopic entropy calculations

Abstract

In four-dimensional N=2 compactifications of string theory or M-theory, modifications of the Bekenstein-Hawking area law for black hole entropy in the presence of higher-derivative interactions are crucial for finding agreement between the macroscopic entropy obtained from supergravity and subleading corrections to the microscopic entropy obtained via state counting. Here we compute the modifications to the area law for various classes of black holes, such as heterotic black holes, stemming from certain higher-derivative gravitational Wilsonian coupling functions. We consider the extension to heterotic N=4 supersymmetric black holes and their type-II duals and we discuss its implications for the corresponding micro-state counting. In the effective field theory approach the Wilsonian coupling functions are known to receive non-holomorphic corrections. We discuss how to incorporate such corrections into macroscopic entropy formulae so as to render them invariant under duality transformations, and we give a concrete example thereof.