Bogomolov-Gieseker type inequalities on ruled threefolds

Abstract

We strengthen a conjecture by the author. This conjecture is a Bogomolov-Gieseker type inequality involving the third Chern character of mixed tilt-stable complexes on fibred threefolds. We extend it from complexes of mixed tilt-slope zero to arbitrary relative tilt-slope. We show that this stronger conjecture implies the support property of Bridgeland stability conditions, and the existence of explicit stability conditions. We prove our conjecture for ruled threefolds, hence improving a previous result by the author.

arXiv comment19 pages. Comments or suggestions are welcome. arXiv admin note: substantial text overlap with arXiv:2201.13251