Relative Riemann-Zariski spaces

Details Relative Riemann-Zariski spaces Relative Riemann-Zariski spaces

2008-04-17

arxiv.org/abs/0804.2843v2

Mathematics

Algebraic Geometry

30 pages, the final version, to appear in Israel J. of Math

Scientific paper

10.1007/s11856-011-0099-0

In this paper we study relative Riemann-Zariski spaces attached to a morphism of schemes and generalizing the classical Riemann-Zariski space of a field. We prove that similarly to the classical RZ spaces, the relative ones can be described either as projective limits of schemes in the category of locally ringed spaces or as certain spaces of valuations. We apply these spaces to prove the following two new results: a strong version of stable modification theorem for relative curves; a decomposition theorem which asserts that any separated morphism between quasi-compact and quasi-separated schemes factors as a composition of an affine morphism and a proper morphism. (In particular, we obtain a new proof of Nagata's compactification theorem.)

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