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4 votes
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Relation between volume of reduced space and phase space

Not a lot. Instead you should generalize $Vol(M)$, the pushforward of Liouville measure to a point, to $Vol_G(M)$, the pushforward along the moment map. I'll assume $G=T$ for convenience. The result i …
Allen Knutson's user avatar
17 votes

Understanding moment maps and Lie brackets

I believe the following way (Kostant's, 1970) to be the best way to think about the Hamiltonian condition. First, "why" is there a central extension $H^0(M; {\mathbb R}) \to C^\infty (M) \to symp(M)$ …
Allen Knutson's user avatar