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Derived categories of toric varieties. (English) Zbl 1159.14026
In this paper, the author investigates the structure of the derived category of a toric variety. If $$X$$ is a projective toric variety with at most quotient singularities, and $$B$$ is an invariant $$\mathbb Q$$-divisor with coefficients of the form $$(r-1)/r$$ with $$r$$ a nonnegative integer, then one can consider the smooth Deligne-Mumford stack $$\mathcal X$$ associated to the pair $$(X,B)$$, as in Y. Kawamata [J. Math. Sci. Univ. Tokyo 12, 211–231 (2005; Zbl 1095.14014)]. The author shows that the derived category $$D^b({\mathcal X})$$ has a complete exceptional collection consisting of sheaves.
In order to prove the result, the author considers a projective space, which is known to have a complete exceptional collection. Using the toric minimal program, he then constructs a complete exceptional collection on any toric variety with at most quotient singularities. Indeed, by a covering trick he proceeds from projective spaces to log Fano varieties. It is now enough to work out Mori fiber spaces: the presence of multiple fibres shows that boundary cases have to be taken into account, and this introduces the branch divisor $$B$$ into the picture. Even if a Mori fiber space can have singular fibers, the associated morphism of stacks is smooth. Then a careful study of “stacky” sheaves gives the required collection (which consists indeed of sheaves) on any toric variety with at most quotient singularities.

##### MSC:
 14M25 Toric varieties, Newton polyhedra, Okounkov bodies 14F05 Sheaves, derived categories of sheaves, etc. (MSC2010) 18E30 Derived categories, triangulated categories (MSC2010)
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