arXiv subjects

Andrea D'Agnolo

Publications and source records attributed to Andrea D'Agnolo.

21 records · Page 2Linked to original sources

arXiv2003

Stacks of twisted modules and integral transforms

Stacks were introduced by Grothendieck and Giraud and are, roughly speaking, sheaves of categories. Kashiwara developed the theory of twisted modules, which are objects of stacks locally equivalent to stacks of modules over sheaves of rings. In this paper we recall these notions, and we develop the formalism of operations for stacks of twisted modules. As an application, we state a twisted version of an adjunction formula which is of use in the theory of integral transforms for sheaves and D-modules.

math.AG↗

arXiv2003

On Dwork cohomology and algebraic D-modules

After works by Katz, Monsky, and Adolphson-Sperber, a comparison theorem between relative de Rham cohomology and Dwork cohomology is established in a paper by Dimca-Maaref-Sabbah-Saito in the framework of algebraic D-modules. We propose here an alternative proof of this result. The use of Fourier transform techniques makes our approach more functorial.

math.AG↗

arXiv1999

Global propagation on causal manifolds

The micro-support of sheaves is a tool to describe local propagation results. A natural problem is then to give sufficient conditions to get global propagation results from the knowledge of the micro-support. This is the aim of this paper. As an application, we consider the problem of global existence for solutions to hyperbolic systems (in the hyperfunction and distribution case), along the lines of Leray. Causal manifolds, and in particular homogeneous causal manifolds as considered by Faraut et al., give examples of manifolds to which our results apply.

math.AP↗