## 2011.70: Weighted projective spaces and iterated Thom spaces.

2011.70:
Anthony Bahri, Matthias Franz and Nigel Ray
(2011)
*Weighted projective spaces and iterated Thom spaces.*

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## Abstract

For any (n+1)-dimensional weight vector chi of positive integers, the weighted projective space P(chi) is a projective toric variety, and has orbifold singularities in every case other than CP^n. We study the algebraic topology of P(chi), paying particular attention to its localisation at individual primes p. We identify certain p-primary weight vectors pi for which P(pi) is homeomorphic to an iterated Thom space over S^2, and discuss how any P(chi) may be reconstructed from its p-primary factors. We express Kawasaki's computations of the integral cohomology ring H^*(P(\chi);Z) in terms of iterated Thom isomorphisms, and recover Al Amrani's extension to complex K-theory. Our methods generalise to arbitrary complex oriented cohomology algebras E^*(P(chi)) and their dual homology coalgebras E_*(P(\chi)), as we demonstrate for complex cobordism theory, which is the universal example. In particular, we describe a fundamental class in Omega_{2n}^U(P(\chi)), which may be interpreted as a resolution of singularities.

Item Type: | MIMS Preprint |
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Subjects: | MSC 2000 > 55 Algebraic topology MSC 2000 > 57 Manifolds and cell complexes |

MIMS number: | 2011.70 |

Deposited By: | Nigel Ray |

Deposited On: | 06 September 2011 |

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