A comparison morphism from the K-theoretical Hall algebra to a twisted cohomological Hall algebra is derived from square roots of Todd classes and extended to symmetric quivers with potential.
Cohomological Hall algebras of quivers and Yangians
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abstract
We construct an isomorphism between the preprojective cohomological Hall algebra of an arbitrary quiver and a positive half of the corresponding Maulik-Okounkov Yangian, which intertwines the respective actions on the cohomology of the Nakajima quiver varieties. We use this to prove a conjecture of Okounkov relating the character of the Maulik-Okounkov Lie algebra to Kac polynomials.
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Comparison of Cohomological and K-theoretical Hall algebra
A comparison morphism from the K-theoretical Hall algebra to a twisted cohomological Hall algebra is derived from square roots of Todd classes and extended to symmetric quivers with potential.