Séminaires de physique et mathématique d'une
durée d'une heure chacun le
mercredi à partir de 14h30 à 15h30 et de 16h30
à 17h30. Le thé est servi à 16h00
Organisateurs :
Francis Brown (CNRS & IHÉS), Pierre Vanhove (IPhT CEA-Saclay & IHÉS)
Current seminar
19 mars 2014
14h30
Dirk Kreimer
Humboldt University, Berlin
Dyson-Schwinger equations and gauge theories
16h30
Stefan Müller-Stach
Johannes Gutenberg-Universität Mainz
Graph hypersurfaces with torus actions
19 février 2014
Journée Autour des Régulateurs et des Valeurs de
Fonctions $L$
14h30
David Broadhurst
Open University
Empirical evaluations of Feynman integrals as
$L$-functions of modular forms with weight $> 2$
Transparents de l'exposé / Slides of the talk : pdf
16h30
François Brunault
École normale
supérieure de Lyon
Non-critical $L$-values of $\ {\mathbb Q}$-curves.
9 Janvier 2014
Journée Autour des Twisteurs et Motifs en Théorie des Champs
14h30
David Skinner
DAMTP, Cambridge University
Type II supergravity as a string theory
Ten dimensional supergravities are well-known to arise as low-energy
limits of string theory. I will show that in fact, these pure
supergravities are complete string theories in their own right. The
strings in question describe holomorphic maps to the space of null
geodesics in complexified space-time, known as ambitwistor space, and
have no massive states in their spectrum. Worldsheet correlators
describe scattering amplitudes in pure supergravity, in a form found
recently by Cachazo, He & Yuan, in which the integral over the moduli
space of marked curves is localized to solutions of the Gross-Mende
equations.
16h30
Spencer Bloch
Univeristy of Chicago & IHÉS
Twistor Integrals
A simple étude on the mathematics of twistor integrals.
20 Novembre 2013
Journée Autour des Formes Modulaires et Amplitudes en Théorie des Cordes
14h30
Michael B. Green
DAMTP, Cambridge University
String Scattering amplitudes, Feynman diagrams and automorphic forms
16h30
Don Zagier
Max Planck Institute Bonn & Collège
de France
Superstring amplitudes and multi-zeta values
