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- Instituto Politécnico de LisboaPT27 papers
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- Istituto Nazionale di Fisica Nucleare, Sezione di TorinoIT4 papers
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4 papers · 1 filter
Characterizing algebraic stacks
Sharon Hollander
We extend the notion of algebraic stack to an arbitrary subcanonical site C. If the topology on C is local on the target and satisfies descent for morphisms, we show that algebraic…
Descent for quasi-coherent sheaves on stacks
Sharon Hollander
We give a homotopy theoretic characterization of sheaves on a stack and, more generally, a presheaf of groupoids on an arbitary small site C. We use this to prove homotopy invarian…
Realizing modules over the homology of a DGA
Gustavo Granja, Sharon Hollander
Let A be a DGA over a field and X a module over H_*(A). Fix an -structure on H_*(A) making it quasi-isomorphic to A. We construct an equivalence of categories between A_{…
Dirac operator coupled to instantons on positive definite 4 manifolds
Joao P Santos
We study the moduli space of instantons on a simply connected positive definite four manifold by analyzing the classifying map of the index bundle of a family of Dirac operators pa…