The equivariant cohomology rings of Peterson varieties
The equivariant cohomology rings of Peterson varieties
复制标题
Peterson 簇的等变上同调环
DOI:
10.2969/jmsj/06731147
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发表时间:
2013
影响因子:
0.7
通讯作者:
M. Masuda
中科院分区:
文献类型:
--
作者:
Yukiko Fukukawa;M. Harada;M. Masuda
The main result of this note is an efficient presentation of the $S^1$-equivariant cohomology ring of Peterson varieties (in type $A$) as a quotient of a polynomial ring by an ideal $\mathcal{J}$, in the spirit of the well-known Borel presentation of the cohomology of the flag variety. Our result simplifies previous presentations given by Harada-Tymoczko and Bayegan-Harada. In particular, our result gives an affirmative answer to a conjecture of Bayegan and Harada that the defining ideal $\mathcal{J}$ is generated by quadratics.