The Mukai pairing, II: the Hochschild-Kostant-Rosenberg isomorphism

Details The Mukai pairing, II: the Hochschild-Kostant-Rosenberg isomorphism The Mukai pairing, II: the Hochschild-Kostant-Rosenberg isomorphism

2003-08-08

arxiv.org/abs/math/0308080v3

Mathematics

Algebraic Geometry

19 pages, uses diagrams.sty, corrected proofs of Theorems 4.1 and 4.4 following a suggestion of Amnon Yekutieli

Scientific paper

We continue the study of the Hochschild structure of a smooth space that we began in our previous paper, examining implications of the Hochschild-Kostant-Rosenberg theorem. The main contributions of the present paper are: -- we introduce a generalization of the usual Mukai pairing on differential forms that applies to arbitrary manifolds; -- we give a proof of the fact that the natural Chern character map $K_0(X) \to HH_0(X)$ becomes, after the HKR isomorphism, the usual one $K_0(X) \to \bigoplus H^i(X, \Omega_X^i)$; and -- we present a conjecture that relates the Hochschild and harmonic structures of a smooth space.

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