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arXiv · 2606.22941

Compatible Lie conformal bialgebras

Lamei Yuan·Jiansen Zhao
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Abstract

We introduce and study compatible Lie conformal bialgebras as conformal counterparts of compatible Lie bialgebras. Such a structure consists of two compatible Lie conformal brackets and two compatible conformal cobrackets on the same $\C[\partial]$-module, and every simultaneous linear combination of them is again a Lie conformal bialgebra. We develop representations and matched pairs for compatible Lie conformal algebras, introduce compatible Lie conformal coalgebras, and establish their duality through the conformal dual in the finite case. For $\C[\p]$-modules that are free of finite rank, we prove the equivalence among compatible Lie conformal bialgebras, standard compatible conformal Manin triples and matched pairs. In the coboundary case, we characterize the tensors $r$ that determine compatible Lie conformal bialgebras. The characterization requires the symmetric part of $r$ to be invariant with respect to both brackets and three conformal Yang--Baxter conditions to hold. The first two conditions correspond to the two brackets separately, whereas the third is the compatible conformal Yang--Baxter condition. For comparison, we introduce the compatible conformal classical Yang--Baxter equation (CYBE) and show that each of its solutions satisfies these three conditions, while the converse fails. One explicit example shows that the first two conditions do not imply the third. Another shows that all three conformal Yang-Baxter conditions may hold even though $r$ is not a solution of compatible conformal CYBE.

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Lamei Yuan, Jiansen Zhao. 2026-06-22. Compatible Lie conformal bialgebras. https://arxiv.org/abs/2606.22941

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