Geodesic
Framed sheaves over treefolds and symmetric obstruction theories
Documenta mathematica, Tome 18 (2013), pp. 323-342.

Voir la notice de l'article provenant de la source Electronic Library of Mathematics

Summary: We note that open moduli spaces of sheaves over local Calabi-Yau surface geometries framed along the divisor at infinity admit symmetric perfect obstruction theories. We calculate the corresponding Donaldson-Thomas weighted Euler characteristics (as well as the topological Euler characteristics). Furthermore, for blowup geometries, we discuss the contribution of exceptional curves.
Classification : 14N35, 14D20
Keywords: moduli spaces of sheaves, Donaldson-Thomas invariants 
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     author = {Oprea, Dragos},
     title = {Framed sheaves over treefolds and symmetric obstruction theories},
     journal = {Documenta mathematica},
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     volume = {18},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_2013__18__a39/}
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Oprea, Dragos. Framed sheaves over treefolds and symmetric obstruction theories. Documenta mathematica, Tome 18 (2013), pp. 323-342. http://geodesic.mathdoc.fr/item/DOCMA_2013__18__a39/