Conferences and talks

Carlos Simpson 


The wildly successful CATS-4 conference
Higher Categorical Structures and their Interactions with Algebraic Geometry, Algebraic Topology and Algebra,
was organized in Luminy, July 2-6, 2012, by the ANR Hodag

I was mentor of the 2011 Talbot Workshop on Non-Abelian Hodge theory, Utah, May 1-7, 2011.
Thanks specially to Hiro Tanaka, Sheel Ganatra and Owen Gwilliam for organizing the workshop with amazing flair,
and thanks to everybody for their wonderful participation, it was great fun!

Mini-workshop on algebraic geometry, Nice, May 10-16th 2011,
organized in the ANR Hodag by C. Simpson (had no time for jet-lag)

Conference GAD-I on higher categories and derived algebraic geometry, Montpellier, May 24-30, 2010,
organized in the ANR Hodag by T. Pantev, C. Simpson, B. Toen, M. Vaquié, G. Vezzosi

The Workshop on Tensors and Interpolation, Nice, June 10-12, 2009, organized by P. Comon, B. Mourrain, C. Simpson

Groupes fondamentaux en géométrie algébrique, workshop of the ANR Sediga,
organized by A. Dimca, C. Simpson in Nice, May 25-27, 2009

The next in the popular Cats series, Cats 3, was organized by T. Pantev, C. Simpson, B. Toen and G. Vezzosi
at the Centro Ennio de Giorgi, Pisa, Italy, 1-5 septembre 2008

The conference Algebraic Geometry and Categories in honor of André Hirschowitz's 61st birthday! June, 2005 

Alessandro Chiodo organized the Journées orbifold in April 2006.

An intermezzo in the tradition of the Cats1,2 conferences was the workshop on Higher stacks in algebraic geometry

Organized by C. Simpson, B. Toen and G. Vezzosi, May 15-19, 2006.

Eugenia Cheng organized the The 85th Peripatetic Seminar on Sheaves and Logic in Nice, March 2007

I was on the scientific commitee of the Conférence de Géométrie Algébrique, I.H.P., Paris, organised by  O. Debarre, Y. Laszlo et C. Voisin (Colloque Anniversaire d'Arnaud Beauville, juin 2007)

Une page pour la Fete de la Science 2005


--- Spectral networks and harmonic maps to buildings,
3rd Itzykson Colloquium: Wall crossing and Hitchin integrable systems, FMJH, IHES, Bures-sur-Yvette, 7 november 2013

--- Towards the boundary of the character variety,
Recent progress in the theory of Painlevé equations: algebraic, asymptotic and topological aspects, CNRS-JSPS, IRMA, Strasbourg, 4-8 november 2013

---Images directes supérieure des systemes locaux et fibrés de Higgs,
Workshop Théorie de Hodge, Jussieu, 19-21 décembre 2012

---Structure at infinity of the moduli space of representations,
Algebraic Geometry seminar, UC Berkeley, le 8 aout 2012

---Restriction of unipotent logarithmic connections and twistor structures,
Conférence Singularités des Equations Différentielles en Géometrie Algébrique,
organisé par l'ANR SEDIGA, Luminy, 4-8 juin 2012

---Structure at infinity of the moduli space of flat connections, parts 1 and 2,
Geometry and Quantization of Moduli Spaces, CRM, Bellaterra, Barcelona, les 17 et 18 avril, 2012

---Homotopy theory of higher categories,
Algebraic stacks: progress and prospects, BIRS, Banff, 26-30 mars 2012

---Local systems on P1 minus 4 points, Algebraic Geometry Seminar, Mainz, le 9 février 2012

---Topological structure at infinity of moduli spaces of flat connections,
Conference on Homological Mirror Symmetry, Miami, 23-27 janvier 2012

---Higher nonabelian cohomology of algebraic varieties,
Arithmetic, Motives and Moduli Spaces, IHP Paris, du 9 au 13 janvier 2012

---The Painlevé VI moduli spaces, Seminar Algebraic Geometry, Max-Planck Institute, le 8 décembre 2011

Here are some abstracts for 2010 and 2011.

---Harmonic bundles--Moduli of representations--Higher nonabelian Hodge theory--Local systems on noncompact varieties,
these were my own talks at the 2011 Talbot Workshop, Draper, Utah, May 1-7, 2011;
see the Talbot website for a list of everybody else's awesome talks!

---Théorie de Hodge pour la cohomologie nonabélienne, Algebraic Analysis seminar, Institut de Mathématiques de Jussieu, March 28th, 2011

---Fibrations on the moduli of parabolic connections on P1 minus 4 points, Newton Institute ``Moduli Spaces'' program, Satellite Workshop MOSW02, ``Representations of surface groups and Higgs Bundles'', Oxford, March 14-18, 2011 (talk March 18th)

---Structures on nonabelian cohomology, Algebra and Geometry seminar, University ``La Sapienza'', Rome, March 9th, 2011

---Moduli of local systems on Deligne-Mumford stacks, COW Seminar, Newton Institute, Special Program on Moduli Spaces, Cambridge March 3rd, 2011

---Higher cohomology stacks over the twistor space Rencontre à l'ENS, ANR ``Sediga'', Paris, February 8th, 2011

---Vers l'infini dans l'espace de connexions, Algebraic geometry seminar, Institut de Mathématiques de Jussieu, February 3rd, 2011

---Foliations on moduli spaces of regular connections, Rencontre à l'ENS, ANR ``Sediga'', Paris, September 21-22, 2010 (talk September 21st)

---Nonabelian cohomology as a shape theory for higher homotopy typesConference GAD-I, Géométrie Algébrique à la Dérive, ANR Hodag, Montpellier, May 24-30, 2010 (talk May 24th)

---Mixed Hodge theory for the local structure of representation spaces, Cohomology of Algebraic Varieties, Hodge Theory, Algebraic Cycles, Motives, IHP, Paris, April 26-30, 2010 (talk April 28th)

---Catégories de modèles pour les n-catégories de Segal, Groupe de travail ``Algèbre et Topologie Homotopiques'', Chevaleret, Institut de Mathématiques de Jussieu, March 10th, 2010

--- Partial Opers,
Geometry and Analysis Seminar, Oxford, October 26, 2009

--- The theory of n-categories and applications to algebraic geometry,
Colloquium, July 27, 2009, Tohoku University, Sendai

--- Differential equations and the topology of algebraic varieties,
video, Colloquium,
July 24, 2009, University of Tokyo

--- Higher stacks and moduli problems: basic notions; moduli of perfect complexes,
, Workshop on Geometry of moduli spaces, Kobe, July 20-22, 2009

--- Lectures on nonabelian Hodge theory I-IV,
notes, video, RIMS workshop on nonabelian Hodge theory and the geometry of twistor structures, Kyoto, July 13-16, 2009

Descent, Aspects de la géométrie algébrique: la postérité mathématique de Grothendieck, IHES, du 12 au 16 janvier 2009

--- Algèbre homotopique, n-champs, infini-champs,  Grothendieck: Biographie, Mathématiques, Philosophie, Peyresq, France, du 24 au 29 aout 2008

 Iterated destabilizing modifications of vector bundles with connection, Conference on vector bundles in honor of S. Ramanan, Miraflores de la Sierra, Madrid, du 16 au 20 juin 2008

---  The role of various structures in nonabelian Hodge theory, Workshop on Noncommutative Constructions in Arithmetic and Geometry, University College, London, 7-8 juin 2008

Phénomènes de monodromie à l'infini: fibrés paraboliques et twisteurs de poids 2, Séminaire de géométrie algébrique, Nice, les 24 et 31 janvier 2008

---  Régulateurs des extensions canoniques, Séminaire autour des cycles algébriques, IMJ Chevaleret, Paris, le 9 janvier 2008 (programme)

---  The shape of an algebraic variety, 68th Kuwait Foundation lecture, University of Cambridge, November 1st, 2007

---  Regulators of canonical extensions, Geometry seminar,
University of Cambridge, October 31st, 2007      (abstracts for the two talks at Cambridge)

---  Topics in the classification of local systems, First French-Spanish mathematical congress, Zaragoza, July 2007

---  A weight 2 property for monodromy at infinity, Interactions with Algebraic Geometry, Firenze, du 30 mai au 2 juin 2007  (schedule)

---  On computer theorem-proving, Colloquium, Columbia University, April 2007

---  Local systems on Deligne-Mumford stacks, Algebraic geometry seminar, Columbia University, April 2007

Espaces de modules de connexions sur P^1 et l'algorithme de Katz
     ---Séminaire de géométrie algébrique Paris-Nantes, IMJ Chavaleret, le 1er février 2007
     ---Journée Géométrie Algébrique Nice-Gênes, le 11 mai 2007 (abstracts of everybody's talks)

--- Things to compute, Computational Algebraic Geometry and Applications (André Galligo's 60th birthday), Nice, June 2-6, 2006

---  Geometricity of the Hodge filtration on the infinity-stack of perfect complexes over X_DR
a talk at the Deligne conference in Princeton, Oct. 18th, 2005
slides (in jpg images)  (see the preprint  ps, pdf)

---  Computer theorem proving in math,
PQR 2003 conference: Possion geometry, deformation quantization and group representations,  Brussels, June 13-22, 2003

alternate conference pagesah pssl nice-genes

Research networks:

European research network:EAGER;

French research network: GAG;

Agence Nationale de la Recherche:
ANR G-Fib    
ANR Sediga     ANR Hodag