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arXiv 1707.02178math.COmath.AG
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应用抛物Peterson:仿射代数和格拉斯曼量子上同调

Applying Parabolic Peterson: Affine Algebras and the Quantum Cohomology of the Grassmannian

Tessa Cookmeyer, Elizabeth Milićević

摘要:

彼得森同构将仿射格拉斯曼的同调与任何旗簇的量子上同调联系起来。在部分标志的情况下,彼得森映射只是一个满射,并且需要通过仿射侧的合适理想进行商,以同构地映射到量子上同调。我们提供了一个详细的阐述,这抛物彼得森同构的情况下,格拉斯曼的m-平面在复杂的n-空间,包括一个明确的配方做量子舒伯特演算的适当子集的非交换k-舒尔函数。作为一个应用程序,我们重铸Postnikov的仿射方法的量子上同调的格拉斯曼作为抛物彼得森的后果,表明仿射nilTemperley-Lieb代数自然产生时,形成必要的商的仿射格拉斯曼的同源性。

英文摘要:

The Peterson isomorphism relates the homology of the affine Grassmannian to the quantum cohomology of any flag variety. In the case of a partial flag, Peterson's map is only a surjection, and one needs to quotient by a suitable ideal on the affine side to map isomorphically onto the quantum cohomology. We provide a detailed exposition of this parabolic Peterson isomorphism in the case of the Grassmannian of m-planes in complex n-space, including an explicit recipe for doing quantum Schubert calculus in terms of the appropriate subset of non-commutative k-Schur functions. As an application, we recast Postnikov's affine approach to the quantum cohomology of the Grassmannian as a consequence of parabolic Peterson by showing that the affine nilTemperley-Lieb algebra arises naturally when forming the requisite quotient of the homology of the affine Grassmannian.

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