By Alexander Astashkevich (auth.), Jean-Luc Brylinski, Ranee Brylinski, Victor Nistor, Boris Tsygan, Ping Xu (eds.)

This ebook is an outgrowth of the actions of the guts for Geometry and Mathematical Physics (CGMP) at Penn country from 1996 to 1998. the guts used to be created within the arithmetic division at Penn kingdom within the fall of 1996 for the aim of marketing and aiding the actions of researchers and scholars in and round geometry and physics on the collage. The CGMP brings many viewers to Penn nation and has ties with different study teams; it organizes weekly seminars in addition to annual workshops The e-book includes 17 contributed articles on present examine issues in a number of fields: symplectic geometry, quantization, quantum teams, algebraic geometry, algebraic teams and invariant idea, and personality istic periods. many of the 20 authors have talked at Penn country approximately their learn. Their articles current new effects or talk about attention-grabbing perspec tives on fresh paintings. the entire articles were refereed within the commonplace model of good medical journals. Symplectic geometry, quantization and quantum teams is one major topic of the ebook. a number of authors examine deformation quantization. As tashkevich generalizes Karabegov's deformation quantization of Kahler manifolds to symplectic manifolds admitting transverse polarizations, and reports the instant map with regards to semisimple coadjoint orbits. Bieliavsky constructs an particular star-product on holonomy reducible sym metric coadjoint orbits of an easy Lie staff, and he indicates the best way to con struct a star-representation which has fascinating holomorphic properties.

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A priori, there is no guarantee that such an operator q(E) exists. ",. j. Now comparing (92) with (67) we conclude that q(E) exists if and only if k(k - l)(k + = q(k)k(k-1). Thus q(k) = (k+ ~)2 is the unique solution. Then arithmetic gives a formula for CXk (which turns out to simplify very nicely). 2. Let S = (A2 - q(E)(1JxO)2) where q(E) is some polynomial in the Euler operator E. Then S is a differential operator on OTeg of order 4 with principal symbol s. S is Euler homogeneous of degree 0 and satisfies the conditions in (59).

We have an algebra grading R(T* X) = $dE'4Rd(T* X), which we call the symbol grading. If D E V(X) has order d, then Ed(D) is the principal symbol of D, denoted by symbol D. , [B-K2, Appendix] for a resume of some basic facts about differential operators and their symbols. An algebraic holomorphic action of G on X induces a natural action of G on T* X which is algebraic holomorphic symplectic. Then the canonical projection T* X --+ X is G-equivariant; the induced action of G on T* X is called the canonical lift of the G-action on X.

4 now says that fo1S is a lowest weight vector of a copy of 9 in V -1 (0). 3. Let 9 The differential operator Do = = s[(m + 1, C), ~S = fo m ~ _1 [A2 - (E + 4fo 1, and define A by (78). 3. We have O. (96) Do satisfies all (97) where CXk is given by (95). 4. We can show that A extends to a differential operator onO. 3. The case 9 = so(N, C), N ~ 6. Here 9 is of type Dn if N = 2n is even or of type Bn if N = 2n + 1 is odd. We unify our treatment of the two types by using the obvious inclusion so(2n, C) C so(2n + 1, C).