Sphere bundles and spin (Ex)
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Latest revision as of 09:24, 1 April 2012
- For , determine the number of distinct linear -bundles over .
- Let be the complex plane bundle with Euler number . Explain how to obtain the total space of the sphere-bundle via surgery on .
For and a smooth closed manifold, let be a nullhomotopic embedding. For spin, show that there is more than one possible diffeormorphism type for the outcome of a surgery on this embedding.
Now suppose is simply connected. For not spin, show that the outcome of a surgery on this embedding is uniquely determined up to diffeomorphism (difficult!).
For hints, see section in [Gompf&Stipsicz1999] on surgery.
References
- [Gompf&Stipsicz1999] R. E. Gompf and A. I. Stipsicz, -manifolds and Kirby calculus, American Mathematical Society, 1999. MR1707327 (2000h:57038) Zbl 0933.57020