The Refined BPS Index from Stable Pair Invariants

Jinwon Choi, Sheldon Katz, Albrecht Klemm

Research output: Contribution to journalArticlepeer-review


A refinement of the stable pair invariants of Pandharipande and Thomas for non-compact Calabi-Yau spaces is introduced based on a virtual Bialynicki-Birula decomposition with respect to a ℂ* action on the stable pair moduli space, or alternatively the equivariant index of Nekrasov and Okounkov. This effectively calculates the refined index for M-theory reduced on these Calabi-Yau geometries. Based on physical expectations we propose a product formula for the refined invariants extending the motivic product formula of Morrison, Mozgovoy, Nagao, and Szendroi for local ℙ1. We explicitly compute refined invariants in low degree for local ℙ1 and local ℙ1 × ℙ1 and check that they agree with the predictions of the direct integration of the generalized holomorphic anomaly and with the product formula. The modularity of the expressions obtained in the direct integration approach allows us to relate the generating function of refined PT invariants on appropriate geometries to Nekrasov's partition function and a refinement of Chern-Simons theory on a lens space. We also relate our product formula to wall crossing.

Original languageEnglish (US)
Pages (from-to)903-954
Number of pages52
JournalCommunications in Mathematical Physics
Issue number3
StatePublished - Jun 2014

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics


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