Bogomolov-Gieseker type inequality and counting invariants

We study a conjectural relationship among Donaldson-Thomas type invariants on Calabi-Yau 3-folds counting torsion sheaves supported on ample divisors, ideal sheaves of curves and Pandharipande-Thomas’s stable pairs. The conjecture is a mathematical formulation of Denef-Moore’s formula derived in the study of Ooguri-Strominger-Vafa’s conjecture relating black hole entropy and topological string. The main result of this paper is to prove our conjecture assuming a conjectural Bogomolov-Gieseker type inequality proposed by Bayer, Macri and the author.