期刊
PROCEEDINGS OF THE LONDON MATHEMATICAL SOCIETY
卷 108, 期 -, 页码 1226-1276出版社
WILEY
DOI: 10.1112/plms/pdt053
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资金
- NSF [0901301]
- Collaborative Research Center SFB Transregio 45 of the German Science foundation
- priority program SPP 1388 of the German Science foundation
- Direct For Mathematical & Physical Scien
- Division Of Mathematical Sciences [0901301] Funding Source: National Science Foundation
We introduce the notion of (homological) G-smoothness for a complex G-variety X, where G is a connected affine algebraic group. This is based on the notion of smoothness for dg algebras and uses a suitable enhancement of the G-equivariant derived category of X. If there are only finitely many G-orbits and all stabilizers are connected, we show that X is G-smooth if and only if all orbits O satisfy H*(O; R) = R. On the way, we prove several results concerning smoothness of dg categories over a graded commutative dg ring.
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