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A spectral sequence for orbifold cobordism

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Ángel A.

Banach Center Publications

2009

tom 85

nr 1

141-154

The aim of this paper is to introduce a spectral sequence that converges to the cobordism groups of orbifolds with given isotropy representations. In good cases the E¹-term of this spectral sequence is given by a certain cobordism group of orbibundles over purely ineffective orbifolds which can be identified with the bordism group of the classifying space of the Weyl group of a finite subgroup of O(n). We use this spectral sequence to calculate some cobordism groups of orbifolds for low dimensions, and in particular, we show that every three dimensional effective oriented orbifold, or even only locally oriented orbifold, bounds. And although every two dimensional effective oriented orbifold bounds, ℝℙ² is the generator of the second cobordism group of locally oriented orbifolds.

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1 Banach Center Publications

1 Ángel A.

1 2009

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A spectral sequence for orbifold cobordism