𝚤Hall algebras of weighted projective lines and quantum symmetric pairs

Lu, Ming; Ruan, Shiquan

doi:10.1090/ert/669

$\imath$Hall algebras of weighted projective lines and quantum symmetric pairs
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by Ming Lu and Shiquan Ruan

Represent. Theory 28 (2024), 112-188

DOI: https://doi.org/10.1090/ert/669

Published electronically: March 4, 2024

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Abstract:

The $\imath$Hall algebra of a weighted projective line is defined to be the semi-derived Ringel-Hall algebra of the category of $1$-periodic complexes of coherent sheaves on the weighted projective line over a finite field. We show that this Hall algebra provides a realization of the $\imath$quantum loop algebra, which is a generalization of the $\imath$quantum group arising from the quantum symmetric pair of split affine type ADE in its Drinfeld type presentation. The $\imath$Hall algebra of the $\imath$quiver algebra of split affine type A was known earlier to realize the same algebra in its Serre presentation. We then establish a derived equivalence which induces an isomorphism of these two $\imath$Hall algebras, explaining the isomorphism of the $\imath$quantum group of split affine type A under the two presentations.

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