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29 March 2024 |
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The age grading and the Chen-Ruan cup product | Richard A. Hepworth
; | Date: |
28 Jun 2007 | Abstract: | We prove that the obstruction bundle used to define the cup-product in
Chen-Ruan cohomology is determined by the so-called `age grading’ or
`degree-shifting numbers’. Indeed, the obstruction bundle can be directly
computed using the age grading. We obtain a Kunneth Theorem for Chen-Ruan
cohomology as a direct consequence of an elementary property of the age
grading, and explain how several other results - including associativity of the
cup-product - can be proved in a similar way. | Source: | arXiv, arxiv.0706.4326 | Services: | Forum | Review | PDF | Favorites |
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