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We prove a filtered version of the Homotopy Transfer Theorem which gives an A-infinity algebra structure on any page of the spectral sequence associated to a filtered dg-algebra. We then develop various applications to the study of the…

Algebraic Topology · Mathematics 2022-10-19 Joana Cirici , Anna Sopena

This article studies the mixed Hodge structures that appear on the complements of generalized theta divisors inside generalized Jacobians of curves with modulus. For a smooth or nodal curve with an effective modulus, the generalized…

Algebraic Geometry · Mathematics 2025-12-04 Mohammad Reza Rahmati

We prove the decomposition theorem for Hodge modules with integral structure along proper K\"ahler morphisms, partially generalizing M. Saito's theorem for projective morphisms. Our proof relies on compactifications of period maps of…

Algebraic Geometry · Mathematics 2024-01-19 Mads Bach Villadsen

We introduce the notion of mixed Hodge complex on an algebraic variety, improving Du Bois' filtered complex, and relate Deligne's theory of mixed Hodge structure with the theory of mixed Hodge module. This was supposed to be true, but is…

Algebraic Geometry · Mathematics 2007-05-23 Morihiko Saito

For a smooth complex projective variety X defined over a number field, we have filtrations on the Chow groups depending of the choice of realizations. If the realization consists of mixed Hodge structure without any additional structure, we…

Algebraic Geometry · Mathematics 2007-05-23 Morihiko Saito

Let $G$ be a complex reductive group, $\theta \colon G \to G$ an involution, and $K = G^\theta$. In arXiv:1206.5547, W. Schmid and the second named author proposed a program to study unitary representations of the corresponding real form…

Representation Theory · Mathematics 2025-09-22 Dougal Davis , Kari Vilonen

We define and construct mixed Hodge structures on real schematic homotopy types of complex projective varieties, giving mixed Hodge structures on their homotopy groups and pro-algebraic fundamental groups. We also show that these split on…

Algebraic Geometry · Mathematics 2014-09-02 J. P. Pridham

We prove a conjecture of Schmid and the second named author that the unitarity of a representation of a real reductive Lie group with real infinitesimal character can be read off from a canonical filtration, the Hodge filtration. Our proof…

Representation Theory · Mathematics 2025-02-18 Dougal Davis , Kari Vilonen

We consider a filtration on the cohomology of the structure sheaf indexed by (not necessarily reduced) divisors ``at infinity''. We show that the filtered pieces have transfers morphisms, fpqc descent, and are so called cube invariant. In…

Algebraic Geometry · Mathematics 2023-06-13 Shane Kelly , Hiroyasu Miyazaki

We study the rescalability of integrable mixed twistor $D$-modules. We prove some basic functoriality of the rescalability and the associated irregular Hodge filtration. We also observe that rescalable integrable mixed twistor $D$-modules…

Algebraic Geometry · Mathematics 2022-08-02 Takuro Mochizuki

We study the mixed twistor D-modules associated to meromorphic functions. In particular, we describe their push-forward and specialization under some situations. We apply the results to study the twistor property of a type of…

Algebraic Geometry · Mathematics 2015-12-22 Takuro Mochizuki

In this article we describe three constructions of complex variations of Hodge structure, proving the existence of interesting opposite filtrations that generalize a construction of Deligne. We also analyze the relation between deformations…

Algebraic Geometry · Mathematics 2007-05-23 Javier Fernandez , Gregory Pearlstein

We establish a relationship between the graded quotients of a filtered holonomic D-module, their sheaf-theoretic duals, and the characteristic variety, in case the filtered D-module underlies a polarized Hodge module on a smooth algebraic…

Algebraic Geometry · Mathematics 2009-04-23 Christian Schnell

Given an irreducible well-generated complex reflection group, we construct an explicit basis for the module of vector fields with logarithmic poles along its reflection arrangement. This construction yields in particular a Hodge filtration…

Differential Geometry · Mathematics 2024-07-17 Takuro Abe , Gerhard Röhrle , Christian Stump , Masahiko Yoshinaga

This paper is concerned with local cohomology sheaves on generalized flag varieties supported in closed Schubert varieties, which carry natural structures as (mixed Hodge) D-modules. We employ Kazhdan--Lusztig theory and Saito's theory of…

Algebraic Geometry · Mathematics 2026-01-30 Michael Perlman

In this paper we introduce a certain space of higher order modular forms of weight 0 and show that it has a Hodge structure coming from the geometry of the fundamental group of a modular curve. This generalizes the usual structure on…

Number Theory · Mathematics 2015-05-14 Ramesh Sreekantan

In this paper, we show that the mixed Hodge structures of character varieties are of Hodge--Tate type and that the mixed Hodge polynomials are independent of the choice of generic eigenvalues, which is a conjecture due to Hausel, Letellier…

Algebraic Geometry · Mathematics 2014-07-15 Arata Komyo

The purpose of this work is to geometrize the notion of mixed Hodge structure. Therefore, we associate equivariant vector bundles on the projective plane to trifiltered vector spaces. Making this Rees construction with filtrations arising…

Algebraic Geometry · Mathematics 2007-05-23 Olivier Penacchio

We review some recent results and conjectures saying that, roughly speaking, periodic cyclic homology of a smooth non-commutative algebraic variety should carry all the additional "motivic" structures possessed by the usual de Rham…

Algebraic Geometry · Mathematics 2010-03-17 D. Kaledin

We use filtered log-$\mathscr{D}$-modules to represent the (dual) localization of Saito's Mixed Hodge Modules along a smooth hypersurface, and show that they also behave well under the direct image functor and the dual functor in the…

Algebraic Geometry · Mathematics 2020-03-12 Chuanhao Wei