Higgs algebra of curves and loop crystals
Higgs algebra of curves and loop crystals
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曲线和环晶体的希格斯代数
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发表时间:
2010
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通讯作者:
Guillaume Pouchin
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作者:
Guillaume Pouchin
We define the Higgs algebra $mathcal{H}_P1$ of the projective line, as a convolution algebra of constructible functions on the global nilpotent cone $underline{Lambda}_P1$, a lagrangian substack of the Higgs bundle $T^*Coh_P1$, where $Coh_P1$ is the stack of coherent sheaves on $P1$. We prove that $mathcal{H}_P1$ is isomorphic to (some completion of) $U^+(hat{sl}_2)$. We use this geometric realization to define a semicanonical basis of $U^+(hat{sl}_2)$, indexed by irreducible components of $underline{Lambda}_P1$. We also construct a combinatorial data on this set of irreducible components in the spirit of cite{KS}, which is an affine analog of a crystal. We call it a loop crystal and give some of its properties.