Framed motivic Donaldson-Thomas invariants of small crepant resolutions

Abstract

For an arbitrary integer $r\ge 1$, we compute $r$-framed motivic PT and DT invariants of small crepant resolutions of toric Calabi-Yau $3$-folds, establishing a "higher rank" version of the motivic DT/PT wall-crossing formula. This generalises the work of Morrison and Nagao. Our formulae, in particular their relationship with the $r=1$ theory, fit nicely in the current development of higher rank refined DT invariants.

Minor revisions. Final version. 14 pages