Mathematics – K-Theory and Homology
Scientific paper
2007-11-07
Algebraic & Geometric Topology 9 (2009) 1751-1790
Mathematics
K-Theory and Homology
40 pages v2: serious mistake in definition of MU(M) corrected, v3: small mistakes corrected, minor additions, fontsize changed
Scientific paper
10.2140/agt.2009.9.1751
The main aim of this paper is the construction of a smooth (sometimes called differential) extension \hat{MU} of the cohomology theory complex cobordism MU, using cycles for \hat{MU}(M) which are essentially proper maps W\to M with a fixed U(n)-structure and U(n)-connection on the (stable) normal bundle of W\to M. Crucial is that this model allows the construction of a product structure and of pushdown maps for this smooth extension of MU, which have all the expected properties. Moreover, we show, using the Landweber exact functor principle, that \hat{R}(M):=\hat{MU}(M)\otimes_{MU^*}R defines a multiplicative smooth extension of R(M):=MU(M)\otimes_{MU^*}R whenever R is a Landweber exact MU*-module. An example for this construction is a new way to define a multiplicative smooth K-theory.
Bunke Ulrich
Schick Thomas
Schroeder Ingo
Wiethaup Moritz
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