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Author | SHA1 | Date |
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Stefan Kebekus | 9033eeb8f4 | |
Stefan Kebekus | 1fb13dfebf |
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Zariski
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holomorphic
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geometers
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Yamanoi
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Brotbek
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Brunebarbe
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Cadorel
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Javanpeykar
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Campana
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hyperbolicity
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subvariety
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Bérczi
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Kirwan
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hypersurfaces
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Diverio-Merker-Rousseau
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Grassmannian
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Riedl-Yang
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Bérczi-Kirwan
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Nezza
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Kebekus
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Mihai
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Păun
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Schreieder
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Kähler
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Saito
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Mustaţă
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Popa
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Schnell
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Bernstein-Sato
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Debarre
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Casalaina-Martin
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Grushevsky
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Riemann-Schottky
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Lefschetz
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Goresky-MacPherson
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Laza
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Calabi-Yau
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fibration
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fibrations
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hyperkähler
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Langrangian
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Bakker
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Shen
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Maulik
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Hausel
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Mellit
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Minets
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Schiffmann
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pushforward
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Maulik-Shen-Yin
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Singer-Hopf
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Hopf
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Arapura
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Sato
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Llosa-Isenrich
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Py
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Goresky
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Schottky
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Calabi
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Yau
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{"rule":"PREPOSITION_VERB","sentence":"^\\QProbably the most complete result in this field is due to A. Bloch (more than 100 years ago), who -in modern language- showed that the Zariski closure of a map \\E(?:Dummy|Ina|Jimmy-)[0-9]+\\Q to a complex torus \\E(?:Dummy|Ina|Jimmy-)[0-9]+\\Q is the translate of a sub-tori.\\E$"}
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{"rule":"PREPOSITION_VERB","sentence":"^\\QIts beginnings date back to 1926, when André Bloch showed that the Zariski closure of entire holomorphic curve \\E(?:Dummy|Ina|Jimmy-)[0-9]+\\Q to a complex torus \\E(?:Dummy|Ina|Jimmy-)[0-9]+\\Q is the translate of a sub-torus.\\E$"}
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{"rule":"MISSING_GENITIVE","sentence":"^\\QHodge modules are used to define generalizations of well-known ideals of singularities, such as multiplier ideals from analysis and algebraic geometry.\\E$"}
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97
MFO26.tex
97
MFO26.tex
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@ -71,69 +71,70 @@
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\subsection{Topology of Kähler spaces: D-modules, perverse sheaves, Hodge modules}
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Over the last decade, Saito’s theory of Hodge modules has seen spectacular
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applications in birational geometry. Over the last few years the theory has been
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further developed and branched out to yield exciting applications to the
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topology of algebraic varieties, singularity theory and commutative algebra.
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The following topics in this area will be of particular interest to our workshop.
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Over the last decade, Saito's theory of Hodge modules has seen spectacular
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applications in birational geometry. More recent developments connect the
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theory to singularity theory, commutative algebra, and the topology of algebraic
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varieties. The following topics in this area will be of particular interest to
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our workshop.
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\subsubsection{Singularities and Hodge ideals}
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Hodge modules are used to define generalizations of well-known ideals of
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singularities, such as multiplier ideals from analysis and algebraic geometry.
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This theory has been put forward by Mustata and Popa, an alternative approach
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was suggested by Schnell and Yang. These generalizations allow to study for
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instance Bernstein-Sato polynomials, which are important commutative algebra
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invariants of singularities that are typically hard to compute. Geometric
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applications are given by the study of singularities of Theta divisors of
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principally polarized abelian varieties, as pursued by Schnell and Yang.
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In a series of influential papers starting with \cite{MR4081135}, Mustaţă and
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Popa used Hodge modules to refine and generalize well-known invariants of
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singularities, most notably the multiplier ideals used in analysis and algebraic
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geometry. An alternative approach towards similar ends was recently suggested in
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the preprint \cite{arXiv:2309.16763} of Schnell and Yang. First applications
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pertain to Bernstein--Sato polynomials and their zero sets; these are important
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invariants of singularities originating from commutative algebra that are hard
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to compute. Schnell and Yang apply their results to conjectures of
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Debarre--Casalaina-Martin--Grushevsky concerning the Riemann--Schottky problem
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and the singularities of Theta divisors of principally polarized Abelian
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varieties.
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In most recent developments by Park and Popa, related methods have been used to
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improve classical Lefschetz theorems for singular varieties due to Goresky-Mac
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Pherson. Originally, Lefschetz theorems for singular varieties have been proven
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via stratified Morse theory, while the recent improvements rely on perverse
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sheaves and D-module theory.
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A related program put forward by Friedman and Laza aims at understanding the
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Hodge structures of degenerating Calabi-Yau varieties. This led to the notions
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of higher Du Bois and higher rational singularities which can be understood via
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Hodge modules and will.
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Very recently, Park and Popa applied perverse sheaves and D-module theory to
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improve Goresky--MacPherson's classic Lefschetz theorems in the singular setting.
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A program put forward by Friedman--Laza aims at understanding the Hodge
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structures of degenerating Calabi--Yau varieties.
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\subsubsection{Lagrangian fibrations}
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A Lagrangian fibration of a (not necessarily compact) hyperkaehler manifold $M$
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is a proper holomorphic map $f:M\to B$ whose fibres are Langrangian
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submanifolds. If $M$ is compact, then a well-known conjecture in the field
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predicts that $B$ is projective space. This is known if $B$ is smooth by
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celebrated work of Hwang. A Hodge theoretic proof of Hwang‘s result has recently
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been found by Bakker and Schnell; the case where $B$ is allowed to be singular
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remains open.
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A Lagrangian fibration of a hyperkähler manifold $M$ is a proper holomorphic map
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$f : M \to B$ whose generic fibers are Langrangian.
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If $M$ is compact, a well-known conjecture in the field predicts that $B$ is
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projective space. In case where $B$ is smooth, the conjecture has been
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established more than 16 years ago in a celebrated work of Hwang. Today, there
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is new insight, as Bakker--Schnell recently found a purely Hodge theoretic proof
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of Hwang's result, \cite{arXiv:2311.08977}. There is hope that these methods
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give insight into the singular setting, which remains open to date.
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In the non-compact setting, Lagrangian fibrations have been studied in the
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framework of the so called P=W conjecture, which has recently been proven by
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Maulik and Shen for the Hitchin fibration associated to the general linear group
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and curves of arbitrary genus $g\geq 2$. Shen and Yin discovered a remarkable
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symmetry of certain pushforward sheaves in the case of Lagrangian fibrations
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over possibly non-compact bases. Recently, Schnell used Saito‘s theory of Hodge
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modules to prove the conjecture of Shen and Yin in full generality.
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framework of the so called $P=W$ conjecture, which has recently been proven by
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Maulik--Shen and Hausel--Mellit--Minets--Schiffmann, \cite{arXiv:2209.02568,
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arXiv:2209.05429}. In the same setting, Shen--Yin discovered a remarkable
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symmetry of certain pushforward sheaves and conjectured that more general
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symmetries exist. These conjectures have recently been established by Schnell,
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\cite{arXiv:2303.05364}, who also proved two conjectures of Maulik--Shen--Yin on
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the behavior of certain perverse sheaves near singular fibers.
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\subsubsection{Singer-Hopf conjecture and fundamental groups of K\"ahler manifolds}
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\subsubsection{Singer--Hopf conjecture and fundamental groups of Kähler manifolds}
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The Singer-Hopf conjecture says that a closed aspherical manifold of real
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dimension $2n$ has positive signed Euler characteristic $(-1)^n\chi(X)\geq 0$.
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This conjecture goes back to 1931, when Hopf formulated a related version for
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Riemannian manifolds. Recently, Hodge-theoretic refinements of this conjecture
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for K\"ahler manifolds have been put forward by Arapura, Maxim and Wang. Special
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cases of these conjecture have recently been proven, but the statement remains
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open in full generality.
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The Singer--Hopf conjecture asserts that a closed aspherical manifold of real
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dimension $2n$ has positive signed Euler characteristic, $(-1)^n \cdot
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\chi(X)\geq 0$. This conjecture goes back to 1931, when Hopf formulated a
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related version for Riemannian manifolds. Recently, Hodge-theoretic refinements
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of this conjecture for Kähler manifolds have been put forward by
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Arapura--Maxim--Wang, \cite{arXiv:2310.14131}. Special cases of these conjecture
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have been proven, but the statement remains open in full generality.
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In a related direction, Llosa-Isenrich and Py found recently an application of
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complex geometry and Hodge theory to geometric group theory, thereby settling an
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old question of of Brady on finiteness properties of groups. As a byproduct,
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In a related direction, Llosa-Isenrich--Py found an application of complex
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geometry and Hodge theory to geometric group theory, settling an old question of
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Brady on finiteness properties of groups, \cite{zbMATH07790946}. As a byproduct,
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the authors also obtain a proof of the classical Singer conjecture in an
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important special case in the realm of K\"ahler manifolds.
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important special case in the realm of Kähler manifolds.
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Our goal in this workshop is to bring together several experts in geometric
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group theory with experts on Hodge theory, and to explore further potential
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95
general.bib
95
general.bib
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@ -1,3 +1,98 @@
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@Article{zbMATH07790946,
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Author = {Llosa Isenrich, Claudio and Py, Pierre},
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Title = {Subgroups of hyperbolic groups, finiteness properties and complex hyperbolic lattices},
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FJournal = {Inventiones Mathematicae},
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Journal = {Invent. Math.},
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ISSN = {0020-9910},
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Volume = {235},
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Number = {1},
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Pages = {233--254},
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Year = {2024},
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Language = {English},
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DOI = {10.1007/s00222-023-01223-3},
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Keywords = {20F65,20F67,57M07,32J27},
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zbMATH = {7790946},
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Zbl = {1530.20138}
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}
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@misc{arXiv:2310.14131,
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title={Hodge-theoretic variants of the Hopf and Singer Conjectures},
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author={Donu Arapura and Laurentiu Maxim and Botong Wang},
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year={2024},
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eprint={2310.14131},
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archivePrefix={arXiv},
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primaryClass={math.AG},
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url={https://arxiv.org/abs/2310.14131},
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}
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@misc{arXiv:2303.05364,
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title={Hodge theory and Lagrangian fibrations on holomorphic symplectic manifolds},
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author={Christian Schnell},
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year={2023},
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eprint={2303.05364},
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archivePrefix={arXiv},
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primaryClass={math.AG},
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url={https://arxiv.org/abs/2303.05364},
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}
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@misc{arXiv:2209.05429,
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title={$P=W$ via $H_2$},
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author={Tamas Hausel and Anton Mellit and Alexandre Minets and Olivier Schiffmann},
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year={2022},
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eprint={2209.05429},
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archivePrefix={arXiv},
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primaryClass={math.AG},
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url={https://arxiv.org/abs/2209.05429},
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}
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@misc{arXiv:2209.02568,
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title={The $P=W$ conjecture for $\mathrm{GL}_n$},
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author={Davesh Maulik and Junliang Shen},
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year={2024},
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eprint={2209.02568},
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archivePrefix={arXiv},
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primaryClass={math.AG},
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url={https://arxiv.org/abs/2209.02568},
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}
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@misc{arXiv:2311.08977,
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title={A Hodge-theoretic proof of Hwang's theorem on base manifolds of Lagrangian fibrations},
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author={Benjamin Bakker and Christian Schnell},
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year={2023},
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eprint={2311.08977},
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archivePrefix={arXiv},
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primaryClass={math.AG},
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url={https://arxiv.org/abs/2311.08977},
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}
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@misc{arXiv:2309.16763,
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title={Higher multiplier ideals},
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author={Christian Schnell and Ruijie Yang},
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month={September},
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year={2023},
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eprint={2309.16763},
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archivePrefix={arXiv},
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primaryClass={math.AG},
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url={https://arxiv.org/abs/2309.16763},
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}
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@article {MR4081135,
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AUTHOR = {Mustaţă, Mircea and Popa, Mihnea},
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TITLE = {Hodge filtration, minimal exponent, and local vanishing},
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JOURNAL = {Invent. Math.},
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FJOURNAL = {Inventiones Mathematicae},
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VOLUME = {220},
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YEAR = {2020},
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NUMBER = {2},
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PAGES = {453--478},
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ISSN = {0020-9910,1432-1297},
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MRCLASS = {14F10 (14F17 14J17 32S25)},
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MRNUMBER = {4081135},
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MRREVIEWER = {Zhi\ Jiang},
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DOI = {10.1007/s00222-019-00933-x},
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URL = {https://doi.org/10.1007/s00222-019-00933-x},
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}
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@misc{arXiv:2406.19003,
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title={Hyperbolicity of generic hypersurfaces of polynomial degree via Green-Griffiths jet differentials},
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