A refinement of Rasmussen's s-invariant
A refinement of Rasmussen's s-invariant
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Rasmussen s 不变量的改进
DOI:
10.1215/00127094-2644466
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
Sucharit Sarkar
中科院分区:
文献类型:
--
作者:
Robert Lipshitz;Sucharit Sarkar
In a previous paper we constructed a spectrum-level refinement of Khovanov homology. This refinement induces stable cohomology operations on Khovanov homology. In this paper we show that these cohomology operations commute with cobordism maps on Khovanov homology. As a consequence we obtain a refinement of Rasmussen's slice genus bound s for each stable cohomology operation. We show that in the case of the Steenrod square Sq^2 our refinement is strictly stronger than s.