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Derived categories of irreducible projective curves of arithmetic genus one

Published online by Cambridge University Press:  25 September 2006

Igor Burban
Affiliation:
Johannes-Gutenberg Universität Mainz, Fachbereich Physik, Mathematik und Informatik, Institut für Mathematik, 55099 Mainz, Germanyburban@mathematik.uni-mainz.de
Bernd Kreußler
Affiliation:
Mary Immaculate College, South Circular Road, Limerick, Irelandbernd.kreussler@mic.ul.ie
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Abstract

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We investigate the bounded derived category of coherent sheaves on irreducible singular projective curves of arithmetic genus one. A description of the group of exact auto-equivalences and the set of all $t$-structures of this category is given. We describe the moduli space of stability conditions, obtain a complete classification of all spherical objects in this category and show that the group of exact auto-equivalences acts transitively on them. Harder–Narasimhan filtrations in the sense of Bridgeland are used as our main technical tool.

Type
Research Article
Copyright
Foundation Compositio Mathematica 2006