Abstract
In a series of papers the authors introduced the so-called blown-up intersection cochains. These cochains are suitable to study products and cohomology operations of intersection cohomology of stratified spaces. The aim of this paper is to prove that the sheaf versions of the functors of blown-up intersection cochains are realizations of Deligne’s sheaves. This proves that Deligne’s sheaves can be incarnated at the level of complexes of sheaves by soft sheaves of perverse differential graded algebras. We also study Poincaré and Verdier dualities of blown-up intersections sheaves with the use of Borel–Moore chains of intersection.
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This research was supported through the program “Research in Pairs” at the Mathematisches Forschunginstitut Oberwolfach in 2016. The authors thank the MFO for its generosity and hospitality. The third author was also supported by the MINECO and FEDER research Project MTM2016-78647-P.
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Chataur, D., Saralegi-Aranguren, M. & Tanré, D. Blown-up intersection cochains and Deligne’s sheaves. Geom Dedicata 204, 315–337 (2020). https://doi.org/10.1007/s10711-019-00458-w
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DOI: https://doi.org/10.1007/s10711-019-00458-w