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arXiv 0901.1506math.COmath.AG
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仿射格拉斯曼的K-理论Schubert演算

K-theory Schubert calculus of the affine Grassmannian

Thomas Lam, Anne Schilling, Mark Shimozono

摘要:

利用Kostant和Kumar的K-理论NilHecke环,构造了单代数群G的仿射Grassmannian的环面等变K-同调的Schubert基.这是彼得森在等变同调中的一个构造的K-理论类似物。对于G = SL_n,仿射Grassmannian的K-同调被证明是对称函数环的一个次霍普夫代数.舒伯特基由非齐次对称函数表示,称为K-k-Schur函数,其最高阶项是k-Schur函数。利用仿射稳定的Grothendieck多项式给出了K-上同调的对偶基,验证了Lam的一个猜想.此外,我们给出了K-同调的Pieri规则。我们的许多建设有几何解释使用柏原的厚仿射旗流形。

英文摘要:

We construct the Schubert basis of the torus-equivariant K-homology of the affine Grassmannian of a simple algebraic group G, using the K-theoretic NilHecke ring of Kostant and Kumar. This is the K-theoretic analogue of a construction of Peterson in equivariant homology. For the case G = SL_n, the K-homology of the affine Grassmannian is identified with a sub-Hopf algebra of the ring of symmetric functions. The Schubert basis is represented by inhomogeneous symmetric functions, called K-k-Schur functions, whose highest degree term is a k-Schur function. The dual basis in K-cohomology is given by the affine stable Grothendieck polynomials, verifying a conjecture of Lam. In addition, we give a Pieri rule in K-homology. Many of our constructions have geometric interpretations using Kashiwara's thick affine flag manifold.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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