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Nonexistence of semiorthogonal decompositions and sections of the canonical bundle
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For any admissible subcategory of the bounded derived category of coherent sheaves on a smooth proper variety, we prove that sections of the canonical bundle impose a strong constraint on the supports of the objects of the subcategory or its semiorthogonal complement. We also show that admissible subcategories are rigid under the actions of topologically trivial autoequivalences. As applications of these results, we prove that the derived category of various minimal varieties in the sense of the minimal model program admit no non-trivial semiorthogonal decompositions, generalizing the result for curves due to the second author to higher dimensions. The case of minimal surfaces is further investigated in detail.
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The Albanese morphism for hyperelliptic varieties
The Albanese variety and Albanese fibers of a hyperelliptic variety X=A/G are explicitly described as (A0/K0)/G and ({a0}+A1)/H, yielding new indecomposability results for derived categories.
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