The microlocal b-function on singular ambient varieties strictly refines the reduced b-function and its minimal exponent detects rational singularities of divisors.
Fourier transform and Radon transform for mixed Hodge modules
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abstract
We give a generalization to bi-filtered $\mathcal D$-modules underlying mixed Hodge modules of the relation between microlocalization along $f_1,...,f_r \in \mathcal O_X(X)$ and vanishing cycles along $g = \sum_{i=1}^r y_i f_i$. This leads to an interesting isomorphism between localization triangles. As an application, we use these results to compare the $k$-plane Radon transform and the Fourier-Laplace transform for mixed Hodge modules. This is then applied to the Hodge module structure of certain GKZ systems.
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Microlocal Bernstein--Sato polynomials on singular ambient varieties
The microlocal b-function on singular ambient varieties strictly refines the reduced b-function and its minimal exponent detects rational singularities of divisors.