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@ -79,3 +79,9 @@ Delcroix
Székelyhidi
Tosatti
Chiu
Oberwolfach
Conlon
Daskalopoulos
Mese
Nevanlinna
arithmetics

257
MFO26.tex
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@ -54,9 +54,6 @@
\maketitle
\section{Workshop Title}
Komplexe Analysis --- Differential and Algebraic methods in Kähler spaces
@ -122,15 +119,18 @@ Secondary & 14 &--& Algebraic geometry \\
\section{Description of the Workshop}
The proposed workshop presents recent results in Complex Geometry and surveys relations to other fields.
For 2026, we would like to emphasize the fields described below.
The proposed workshop presents recent results in Complex Geometry and surveys
relations to other fields. For 2026, we would like to emphasize the fields
described below.
Each relates to complex analysis differently.
Each has seen substantial progress recently, producing results that will be of importance for years to come.
%The bullet items list some of the latest developments that have attracted our attention.
%We plan to include at least one broader overview talk for each of the three subjects, as well as more specialized presentations by senior experts and junior researchers.
We will account for new developments that arise between the time of submission of this proposal and the time of the workshop.
Following good Oberwolfach tradition, we will keep the number of talks small to provide ample opportunity for informal discussions.
We will account for new developments that arise between the time of submission
of this proposal and the time of the workshop. Following good Oberwolfach
tradition, we will keep the number of talks small to provide ample opportunity
for informal discussions.
%After so many months of the pandemic, this will be more than welcome!
@ -140,16 +140,16 @@ Following good Oberwolfach tradition, we will keep the number of talks small to
In the proof of the Donaldson--Tian--Yau conjecture, which Chen--Donaldson--Sun
gave in a series of papers around 2015, Kähler--Einstein metrics with conic
singularities along a smooth divisor emerged to play a vital role. Since then,
these metrics have become an object of study in their own right. The work of
singularities along a smooth divisor emerged to play a vital role. The work of
Brendle, Donaldson, Guenancia, Rubinstein, and many others provides a complete
package of results that generalize Yau's celebrated solution of the Calabi
conjecture to the conic setting. Today, many exciting recent developments in
conjecture to the conic setting. Since then, these metrics have become an
object of study in their own right. Today, many exciting recent developments in
this field gravitate around the following general question.
\begin{q}
Let $X$ be a projective manifold, and let $D\subset $ be a non-singular
divisor. Assume that for every sufficiently small angle $0< \beta << 1$,
Let $X$ be a projective manifold, and let $D \subsetneq X$ be a non-singular
divisor. Assume that for every sufficiently small angle $0 < \beta \ll 1$,
there exists a unique Kähler--Einstein metric $\omega_\beta$ with conic
singularities of angle $2\pi\beta$ along $D$. In other words, assume that
\[
@ -161,9 +161,9 @@ this field gravitate around the following general question.
rescaling?
\end{q}
Starting with \cite{zbMATH07615186}, a series of articles by Biquard--Guenancia
settles many relevant (and technically challenging!) particular cases of this
question.
In \cite{zbMATH07615186} and the very recent preprint \cite{arXiv:2407.01150},
Biquard--Guenancia begin settling relevant (and technically challenging!)
particular cases of this question.
\begin{itemize}
\item If $(X,D)$ is the toroidal compactification of a ball quotient, then the
limit of the metric exists and equals the hyperbolic metric.
@ -200,43 +200,11 @@ metric. Using the bounded geometry method, Datar--Fu--Song recently showed an
analogous result in the case of isolated log canonical singularities
\cite{zbMATH07669617}. FuHeinJiang obtained precise asymptotics shortly
after, \cite{zbMATH07782497}. Essential contributions directly connected to
these topics are due to Chiu, Delcroix, Hein, C.~Li, Y.~Li, Sun, Székelyhidi,
Tosatti, and Zhang.
\bigskip
{\color{red}\textbf --- DO NOT READ ANYTHING BELOW THIS LINE ---}
these topics are due to Chiu--Székelyhidi \cite{zbMATH07810677}, Delcroix,
Conlon--Hein \cite{zbMATH07858206}, C.~Li, Y.~Li, Tosatti and Zhang.
\subsubsection{Complex hyperbolicity}
The Green-Griffiths conjecture (concerning the Zariski closure of holomorphic
entire curves or more generally, of families of holomorphic disks on varieties
of general type) continues to keep busy many complex geometers. Probably 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 $\varphi:
\mathbb C \to A$ to a complex tori $A$ is the translate of a sub-tori. A decade
ago, K.~Yamanoi established the Green-Griffiths conjecture for projective
manifolds general type, which admit a generically finite map into an Abelian
variety. This represents a very nice generalization of Bloch's theorem.
In the last couple of years the field is taking a very interesting direction, by
combining techniques from Hodge theory with the familiar Nevanlinna theory and
jet differentials, cf. the articles by D. Brotbek, Y. Deng, Y. Brunebarbe, B.
Cadorel and A. Javanpeykar.
Using recent advances in the theory of harmonic maps (due to
Daskalopoulos-Mese), Y. Deng and K. Yamanoi were able to confirm the
Green-Griffiths conjecture for manifolds whose fundamental group admits a
representation having certain natural properties (echoing the case of curves of
genus at least two).
Techniques from birational geometry, in connection with the work of F.~Campana
are also present in the field via the -long awaited- work of E. Rousseau and its
collaborators.
\subsubsection{Complex hyperbolicity. Mark II}
\subsubsection{Complex Hyperbolicity}
The 1979 Green-Griffiths-Lang conjecture asserts that every complex-projective
variety $X$ of general type contains a proper subvariety $Y \subsetneq X$, such
@ -244,10 +212,15 @@ that every non-constant entire holomorphic curve $\mathbb C \to X$ takes its
values in $Y$. Its beginnings date back to 1926, when André Bloch showed that
the Zariski closure of entire holomorphic curve $\varphi: \mathbb C \to A$ to a
complex torus $A$ is the translate of a sub-torus. Today, the conjecture still
drives much of the research in complex geometry. We highlight several advances
that will be relevant for our workshop.
drives substantial research in complex geometry. Several authors, including
Brotbek, Brunebarbe, Deng, Cadorel, and Javanpeykar, opened a new research
direction with relation to arithmetic, by combining techniques from Hodge theory
with Nevanlinna theory and jet differentials, \cite{arXiv:2007.12957,
arXiv:2207.03283, arXiv:2305.09613}. Besides, we highlight two additional
advances that will be relevant for our workshop.
\paragraph{Hypersurfaces in projective space}
\paragraph{Hypersurfaces in Projective Space}
A remarkable paper of Bérczi and Kirwan, \cite{MR4688701} published in September
last year, establishes hyperbolicity and proves the Green-Griffiths-Lang for
@ -261,43 +234,28 @@ recent preprint of Cadorel simplifies the proof Bérczi-Kirwan substantially, bu
still needs to undergo a peer review, \cite{arXiv:2406.19003}.
\paragraph{Hyperbolicity and representations of fundamental groups}
\paragraph{Representations of Fundamental Groups}
Using recent advances in the theory of harmonic maps (due to
Daskalopoulos-Mese, cf. \cite{arXiv:2112.13961}), B. Cadorel, Y. Deng K. Yamanoi were able to confirm the
Green-Griffiths conjecture for manifolds whose fundamental group admits a
representation having certain natural properties (echoing the case of curves of
genus at least two), cf. \cite{arXiv:2212.12225}.
Using recent advances in the theory of harmonic maps due to Daskalopoulos--Mese
\cite{arXiv:2112.13961}, Deng--Yamanoi were able to confirm the Green--Griffiths
conjecture for manifolds whose fundamental group admits a representation having
certain natural properties, in direct analogy to the case of general-type
curves.
\paragraph{Material collections}
\subsection{Topology and Hodge Theory of Kähler spaces}
In the last couple of years the field is taking a very interesting direction, by
combining techniques from Hodge theory with the familiar Nevanlinna theory and
jet differentials, cf. the articles by D. Brotbek, Y. Deng, Y. Brunebarbe, B.
Cadorel and A. Javanpeykar, cf. \cite{arXiv:2007.12957}, \cite{arXiv:2305.09613}, \cite{arXiv:2207.03283}.
\subsection{Topology of Kähler spaces: D-modules, perverse sheaves, Hodge modules}
Over the last decade, Saito's theory of Hodge modules has seen spectacular
applications in birational geometry. More recent developments, which are of
significant importance, connect the theory to singularity theory, commutative
algebra, and the topology of algebraic varieties. The following topics in this
area will particularly interest our workshop.
Ever since its invention, Hodge theory has been one of the most powerful tools
in studying the geometry and topology of Kähler spaces. More recent
developments connect the theory to singularity theory, commutative algebra, and
the topology of algebraic varieties. The following topics in this area will
particularly interest our workshop.
\subsubsection{Singularities and Hodge Ideals}
In a series of influential papers starting with \cite{MR4044463}, % \cite{MR4081135} is not the first one
Mustaţă and Popa used Hodge modules to refine and generalize well-known invariants of
In a series of influential papers starting with \cite{MR4081135}, Mustaţă and
Popa used Hodge modules to refine and generalize well-known invariants of
singularities, most notably the multiplier ideals used in analysis and algebraic
geometry. Schnell and Yangs recent preprint \cite{arXiv:2309.16763} suggested
an alternative approach toward similar ends. The first applications pertain to
@ -314,7 +272,7 @@ program put forward by Friedman--Laza aims at understanding the Hodge structures
of degenerating Calabi--Yau varieties.
\subsubsection{Lagrangian fibrations}
\subsubsection{Lagrangian Fibrations}
A Lagrangian fibration of a hyperkähler manifold $M$ is a proper holomorphic map
$f : M \to B$ whose generic fibers are Langrangian.
@ -322,31 +280,27 @@ $f : M \to B$ whose generic fibers are Langrangian.
\paragraph{Compact Setting}
If $M$ is compact, a well-known conjecture in the field predicts that $B$ should be the
projective space. A strong evidence for this problem is due to Hwang: he established the
conjecture more than 16 years ago in a celebrated paper, provided that the base $B$ is smooth.
There is new insight
today, with two alternative arguments for the proof of this theorem.
Bakker--Schnell recently found a purely Hodge theoretic proof of
Hwang's result in \cite{arXiv:2311.08977}. On the other hand Tosatti--Li, cf. \cite{arXiv:2308.10553}
found a more differential-geometric argument, which relied heavily on a singular version of Mok's uniformisation theorem.
Even if both methods are using results about rational curves -which confines them from the start to
the smooth case-, we hope that they put Hwang's result in a new perspective, hopefully helpful to progress towards the general case.
If $M$ is compact, a well-known conjecture in the field predicts that $B$ is
projective space. In the case where $B$ is smooth, Hwang established the
conjecture more than 16 years ago in a celebrated paper. There is new insight
today, as Bakker--Schnell recently found a purely Hodge theoretic proof of
Hwang's result in \cite{arXiv:2311.08977}. Hopefully, these methods will give
insight into the singular setting, which remains open to date.
\paragraph{Non-compact Setting}
In the non-compact setting, geometers study Lagrangian fibrations in the
framework of the ``$P=W$ conjecture,'' which MaulikShen and
HauselMellitMinetsSchiffmann have recently proved \cite{arXiv:2209.02568,
arXiv:2209.05429}. In the same setting, ShenYin discovered a remarkable
symmetry of certain pushforward sheaves and conjectured that more general
symmetries exist. Schnell has recently established these conjectures in
\cite{arXiv:2303.05364} and also proved two conjectures of MaulikShenYin on
the behavior of certain perverse sheaves near singular fibers.
Geometers study Lagrangian fibrations over non-compact bases in the framework of
the ``$P=W$ conjecture,'' which Maulik--Shen and Hausel--Mellit--Minets--Schiffmann
have recently proved \cite{arXiv:2209.02568, arXiv:2209.05429}. In the same
setting, ShenYin discovered a remarkable symmetry of certain pushforward
sheaves and conjectured that more general symmetries exist. Schnell has recently
established these conjectures in \cite{arXiv:2303.05364} and also proved two
conjectures of MaulikShenYin on the behavior of certain perverse sheaves near
singular fibers.
\subsubsection{Singer--Hopf conjecture and fundamental groups of Kähler manifolds}
\subsubsection{Singer--Hopf Conjecture and Fundamental Groups of Kähler Manifolds}
The Singer-Hopf conjecture asserts that a closed aspherical manifold of real
dimension $2n$ has positive signed Euler characteristic, $(-1)^n \cdot
@ -368,105 +322,6 @@ applications of the methods from one field to problems in the other.
\section{Suggested dates}
We would prefer if our workshop took place in mid of September or early to mid April.
%If this date is not available, early to mid-April would be an alternative.
%The workshop ``Komplexe Analysis'' traditionally takes place in the first week
%of September. We would like to follow this tradition. If the traditional date is
%not available, early to mid-April would be an alternative.
\section{Preliminary list of proposed participants}
Below is a preliminary list of people we would like to invite\footnote{We list
colleagues as ``young'' if they have no tenured job, or if their tenure is
less than about three years old.}.
{\small
\begin{longtable}[c]{lccccccc}
\rowcolor{lightgray} \multicolumn{2}{l}{\textbf{Name}} & \textbf{Location} & \multicolumn{3}{c}{\textbf{Subject}} & \textbf{Young} & \textbf{Woman} \\
\rowcolor{lightgray} &&& §5.1 & §5.2 & & & \\\hline \endhead
%Araujo&Carolina&Rio de Janeiro&&&&&1 \\
Bakker&Benjamin&Chicago&&&&& \\
Berndtsson&Bo&Göteborg&&&&& \\
%Bertini&Valeria&Chemnitz&&1&&1&1 \\
%Blum&Harold&Stony Brook&1&1&&1 \\
Boucksom&Sebastien&Paris&&&&& \\
Braun&Lukas&Innsbruck&&&&1& \\
Brotbek&Damian&Nancy&&&&& \\
Brunebarbe&Yohan&CNRS/Bordeaux&&&&& \\
Cadorel&Benoit&Nancy&&&&1& \\
Campana&Frédéric&Nancy&&&&& \\
Cao&Junyan&Nice&&&&& \\
Castravet&Ana-Maria&Versailles&&&&&1\\
%Chen&Jiaming&Nancy&1&1&&1& \\
Claudon&Benoit&Rennes&&&&& \\
%Commelin&Johan&Freiburg&&&1&1& \\
%Darvas&Tamás&Maryland&1&&&& \\
Das&Omprokash &TIFR Mumbai&&&&1&\\
Delcroix&Thibaut&Montpellier&&&&& \\
Deng&Ya&CNRS/Nancy&&&&& \\
%di Nezza&Eleonora&CNRS/Palaiseau&1&&&1&1 \\
Dutta&Yagna&Leiden&&&&&1\\
Eyssidieux&Philippe &Grenoble&&&&&\\
Gachet&C\'ecile & Berlin&&&&&1\\
Graf&Patrick&Bayreuth&&&&1&\\
Greb&Daniel&Essen&&&&& \\
%Grossi&Annalisa&Chemnitz&&1&&1&1 \\
Guenancia&Henri&CNRS/Toulouse&&&&& \\
Hao&Feng& Shandong University&&&&&\\
Hein&Hans-Joachim&Münster&&&&& \\
%Huang&Xiaojun&Rutgers&1&&&& \\
Hulek&Klaus&Hannover&&&&& \\
Hoskins&Victoria&Essen&&&&&1\\
Höring&Andreas&Nice&&&&& \\
Hwang&Jun-Muk &Daejeon&&&&&\\
Javanpeykar&Ariyan &Nijmegen&&&&&\\
Kirwan&Frances&Oxford&&&&&1\\
Klingler&Bruno&Berlin&&&&& \\
%Koike&Takayuki&Osaka&1&1&&1& \\
Lehn&Christian&Chemnitz&&&&& \\
%Li&Chi&Rutgers&1&&&& \\
Lin&Hsueh-Yung&Taiwan&&&&&\\
Llosa-Isenrich& Claudio& Karlsruhe&&&&1&\\
%Lu&Hoang-Chinh&Orsay&1&&&1& \\
%Martinelli&Diletta&Amsterdam&&1&&1&1 \\
%Matsumura&Shin-Ichi&Tohoku&&1&&1& \\
Mauri&Mirko&Paris&&&&1& \\
Moraga&Joaquín&UCLA&&&&1& \\
M\"uller&Niklas&Essen&&&&1&\\
%Olano&Sebastián&Northwestern&&1&&1& \\
Ortega&Angela&Berlin&&&&&1\\
Ou&Wenhao&AMSS, China&&&&1&\\
Park&Sung Gi &Harvard&&&&&\\
Paulsen&Matthias&Marburg& &&& 1 & \\
%Paul&Sean T.&Wisconsin&1&&&& \\
Peternell&Thomas&Bayreuth&&&&& \\
Py& Pierre& Grenoble&&&&&\\
Rousseau& Erwan& Brest&&&&&\\
%Saccá&Giulia&NYU&1&1&&&1 \\
Schnell&Christian&Stony Brook&&&&& \\
%Shentu&Junchan&Heifei&&1&&1 \\
%Siarhei&Finski&Grenoble&&&&1& \\
Spelta&Irene&Barcelona&&&&&1\\
Stenger&Isabel&Hannover&&&&&1\\
Tasin&Luca&Mailand&&&&1&\\
%Takayama&Shigeharu&Tokyo&&1&&& \\
Tosatti&Valentino&Northwestern&&&&& \\
%Ungureanu&Mara&Freiburg&&1&&1&1 \\
Wang&Botong&University of Wisconsin&&&&&\\
%Wang&Juanyong&Beijing&&1&&1& \\
Witt-Nyström&David&Göteborg&&&&& \\
%Wu&Xiaojun&Bayreuth&&&&1& \\
%Xiao&Ming&UCSD&1&&&1& \\
%Xu&Chenyang&Princeton&&1&&& \\
Yang&Ruijie&Humboldt&&&&1&
\end{longtable}
} % \scriptsize
\bibstyle{alpha}

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@ -1,3 +1,82 @@
@misc{arXiv:2207.03283,
title={Hyperbolicity in presence of a large local system},
author={Yohan Brunebarbe},
year={2022},
eprint={2207.03283},
archivePrefix={arXiv},
primaryClass={math.AG},
url={https://arxiv.org/abs/2207.03283},
}
@misc{arXiv:2305.09613,
title={The relative Green-Griffiths-Lang conjecture for families of varieties of maximal Albanese dimension},
author={Yohan Brunebarbe},
year={2023},
eprint={2305.09613},
archivePrefix={arXiv},
primaryClass={math.AG},
url={https://arxiv.org/abs/2305.09613},
}
@misc{arXiv:2007.12957,
title={Arakelov-Nevanlinna inequalities for variations of Hodge structures and applications},
author={Damian Brotbek and Yohan Brunebarbe},
year={2020},
eprint={2007.12957},
archivePrefix={arXiv},
primaryClass={math.AG},
url={https://arxiv.org/abs/2007.12957},
}
@misc{arXiv:2112.13961,
title={Infinite energy maps and rigidity},
author={Daskalopoulos, Georgios and Mese, Chikako},
year={2021},
month={December},
url={https://arxiv.org/abs/2112.13961}
}
@Article{zbMATH07858206,
Author = {Conlon, Ronan J. and Hein, Hans-Joachim},
Title = {Classification of asymptotically conical {Calabi}-{Yau} manifolds},
FJournal = {Duke Mathematical Journal},
Journal = {Duke Math. J.},
ISSN = {0012-7094},
Volume = {173},
Number = {5},
Pages = {947--1015},
Year = {2024},
Language = {English},
DOI = {10.1215/00127094-2023-0030},
Keywords = {53C25,14J32},
zbMATH = {7858206}
}
@Article{zbMATH07810677,
Author = {Chiu, Shih-Kai and Sz{\'e}kelyhidi, G{\'a}bor},
Title = {Higher regularity for singular {K{\"a}hler}-{Einstein} metrics},
FJournal = {Duke Mathematical Journal},
Journal = {Duke Math. J.},
ISSN = {0012-7094},
Volume = {172},
Number = {18},
Pages = {3521--3558},
Year = {2023},
Language = {English},
DOI = {10.1215/00127094-2022-0107},
Keywords = {32Q20,32Q25,53C25},
URL = {projecteuclid.org/journals/duke-mathematical-journal/volume-172/issue-18/Higher-regularity-for-singular-K%c3%a4hlerEinstein-metrics/10.1215/00127094-2022-0107.full},
zbMATH = {7810677}
}
@misc{arXiv:2407.01150,
title={Degenerating conic Kähler-Einstein metrics to the normal cone},
author={Biquard, Olivier and Guenancia, Henri},
year={2024},
month={July},
url={https://arxiv.org/abs/2407.01150},
}
@Article{zbMATH07782497,
Author = {Fu, Xin and Hein, Hans-Joachim and Jiang, Xumin},
Title = {Asymptotics of {K{\"a}hler}-{Einstein} metrics on complex hyperbolic cusps},