Topology of Conic Bundles - II

Preprint

25 February 1996

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.alg-geom/9602017

Abstract

For conic bundles on a smooth variety (over a field of characteristic $\ne 2$) which degenerate into pairs of distinct lines over geometric points of a smooth divisor, we prove a theorem which relates the Brauer class of the non-degenerate conic on the complement of the divisor to the covering class (Kummer class) of the 2-sheeted cover of the divisor defined by the degenerate conic, via the Gysin homomorphism in etale cohomology. This theorem is the algebro-geometric analogue of a topological result proved earlier.

Keywords

DEGENERATE CONIC
PROVED EARLIER
SMOOTH VARIETY
SHEETED COVER
CONIC BUNDLES
KUMMER CLASS
DIVISOR

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Version 1, 1996-02-25, ArXiv

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