Chen-Ruan cohomology and stringy orbifold K-theory for stable almost complex orbifolds

Chen-Ruan cohomology and stringy orbifold K-theory for stable almost complex orbifolds
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Chen-Ruan上同调和稳定几乎复数轨道折叠的弦轨道K理论

DOI:
10.1007/s11401-020-0231-8
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发表时间:
2020-09
期刊:
Chinese Annals of Mathematics, Series B
影响因子:
--
通讯作者:
Tiyao Li
Tiyao Li
中科院分区:
其他
文献类型:
--
作者:
Chengyong Du;Tiyao Li

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与等变稳定几乎复数轨道的弦上同调环的构造及其与商几乎复数轨道折叠的Chen-Ruan上同调环的关系相比,作者在本文中构造了稳定几乎复数轨道折叠的Chen-Ruan上同调环。作者证明,对于有限群 G 和 G 等变稳定的几乎复数流形 X,(X,G) 的弦上同调环的 G 不变部分与全局商稳定的几乎复数轨道折叠 [X/G] 的 Chen-Ruan 上同调环同构。当 G 是环面并且作用是局部自由时,类似的结果成立。此外,对于紧致稳定的几乎复数轨道折叠,他们研究了弦轨道折叠K理论及其与Chen-Ruan上同调环的关系。
Comparing to the construction of stringy cohomology ring of equivariant stable almost complex manifolds and its relation with the Chen-Ruan cohomology ring of the quotient almost complex orbifolds, the authors construct in this note a Chen-Ruan cohomology ring for a stable almost complex orbifold. The authors show that for a finite group G and a G-equivariant stable almost complex manifold X, the G-invariant part of the stringy cohomology ring of (X,G) is isomorphic to the Chen-Ruan cohomology ring of the global quotient stable almost complex orbifold [X/G]. Similar result holds when G is a torus and the action is locally free. Moreover, for a compact presentable stable almost complex orbifold, they study the stringy orbifold K-theory and its relation with.Chen-Ruan cohomology ring.
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