Maulik-Okounkov Lie algebras and BPS Lie algebras

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• Tommaso Maria Botta (ETH Zurich)
• Thursday 20 June 2024, 14:50-15:30
• Seminar Room 1, Newton Institute.

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EMGW05 - Moduli stacks and enumerative geometry

The Maulik-Okounkov Lie algebra associated to a quiver Q controls the R-matrix formalism developed by Maulik and Okounkov in the context of quantum cohomology of Nakajima quiver varieties. On the other hand, the BPS Lie algebra originates from cohomological DT theory, particularly from the theory of cohomological Hall algebras associated with 3 Calabi-Yau categories. In this talk, I will explain how to identify the MO Lie algebra of Q with the BPS Lie algebra of the tripled quiver Q̃ with its canonical cubic potential. The bridge to compare these similarly diverse words is the theory of non-abelian stable envelopes, which can be exploited to relate representations of the MO Lie algebra to representations of the BPS Lie algebra. In conclusion, I will explain how to use these results to deduce Okounkov’s conjecture, equating the graded dimensions of the MO Lie algebra with the coefficients of Kac polynomials. This is joint work with Ben Davison.

This talk is part of the Isaac Newton Institute Seminar Series series.

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