Journal of Noncommutative Geometry
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Published online: 2016-09-28
Matrix factorizations and semi-orthogonal decompositions for blowing-upsValery A. Lunts and Olaf M. Schnürer (1) Indiana University, Bloomington, USA
(2) Universität Bonn, Germany
We study categories of matrix factorizations. These categories are defined for any regular function on a suitable regular scheme. Our paper has two parts. In the first part we develop the foundations; for example we discuss derived direct and inverse image functors and dg enhancements. In the second part we prove that the category of matrix factorizations on the blowing-up of a suitable regular scheme $X$ along a regular closed subscheme $Y$ has a semi-orthogonal decomposition into admissible subcategories in terms of matrix factorizations on $Y$ and $X$. This is the analog of a well-known theorem for bounded derived categories of coherent sheaves, and is an essential step in our forthcoming article  which defines a Landau–Ginzburg motivic measure using categories of matrix factorizations. Finally we explain some applications.
Keywords: Matrix factorization, semi-orthogonal decomposition, blowing-up, projective space bundle, dg enhancement
Lunts Valery, Schnürer Olaf: Matrix factorizations and semi-orthogonal decompositions for blowing-ups. J. Noncommut. Geom. 10 (2016), 907-979. doi: 10.4171/JNCG/252