Failure of the parametric h-principle for maps with prescribed jacobian

Details Failure of the parametric h-principle for maps with prescribed jacobian Failure of the parametric h-principle for maps with prescribed jacobian

2005-12-06

arxiv.org/abs/math/0512126v1

Mathematics

Geometric Topology

26 pages. 6 figures

Scientific paper

Let M and N be closed n-dimensional manifolds, and equip N with a volume form \sigma. Let \mu be an exact n-form on M. Arnold then asked the question: When can one find a map f:;N such that f*\sigma=\mu. In 1973 Eliashberg and Gromov showed that this problem is, in a deep sense, trivial: It satisfies an h-principle, and whenever one can find a bundle map f_bdl:T M to T N which is degree 0 on the base and induces \mu one can homotop this map to a solution f. That is if the naive topological conditions are satisfied on can find a solution. There is no further interesting geometry in the problem. We show the corresponding parametric h-principle fails- if one considers families of maps inducing \mu from \sigma, one can find interesting topology in the space of solutions which is not predicted by an h-principle. Moreover the homotopy type of such maps is quantized: for certain families of forms homotopy type remains constant, jumping only at discrete values.

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