Categories O for Dynkin Borel Subalgebras of Root-Reductive Lie Algebras
Categories O for Dynkin Borel Subalgebras of Root-Reductive Lie Algebras
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发表时间:
2017-06
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通讯作者:
Thanasin Nampaisarn
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作者:
Thanasin Nampaisarn
The purpose of my Ph.D. research is to define and study an analogue of the classical Bernstein-Gelfand-Gelfand (BGG) category O for the Lie algebra g, where g is one of the finitary, infinite-dimensional Lie algebras gl(∞,K), sl(∞,K), so(∞,K), and sp(∞,K). Here, K is an algebraically closed field of characteristic 0. We call these categories extended categories O and use the notation O. While the categories O are defined for all splitting Borel subalgebras of g, this research focuses on the categories O for very special Borel subalgebras of g which we call Dynkin Borel subalgebras. Some results concerning block decomposition and Kazhdan-Lusztig multiplicities carry over from usual categories O to our categories O. There are differences which we shall explore in detail, such as the lack of some injective hulls. In this connection, we study truncated categories O and are able to establish an analogue of BGG reciprocity in the categories O.