25 let teorie strun: výsledky a naděje
A coding of real null four-momenta into world-sheet coordinates.
A descendent relation in genus 2
A journey between two curves.
Bifundamental fuzzy 2-sphere and fuzzy Killing spinors.
Boundary Liouville theory: Hamiltonian description and quantization.
BPS states of curves in Calabi-Yau 3-folds.
Central extensions and stochastic processes associated with the Lie algebra of the renormalized higher powers of white noise
In the first part of the paper we discuss possible definitions of Fock representation of the *-Lie algebra of the Renormalized Higher Powers of White Noise (RHPWN). We propose one definition that avoids the no-go theorems and we show that the vacuum distribution of the analogue of the field operator for the n-th renormalized power of WN defines a continuous binomial process. In the second part of the paper we present without proof our recent results on the central extensions of RHPWN, its subalgebras...
Cocalibrated -manifolds with Ricci flat characteristic connection
Any 7-dimensional cocalibrated -manifold admits a unique connection with skew symmetric torsion (see [8]). We study these manifolds under the additional condition that the -Ricci tensor vanish. In particular we describe their geometry in case of a maximal number of -parallel vector fields.
Dualités de champs et de cordes
Dynamical symmetries in supersymmetric matrix models.
Fixed Points and D-branes
Fourier Mukai transforms and applications to string theory.
El artículo es una introducción a la transformación de Fourier-Mukai y sus aplicaciones a varios problemas de móduli, teoría de cuerdas y simetría "mirror". Se desarrollan los fundamentos necesarios para las transformaciones de Fourier-Mukai, entre ellos las categorías derivadas y los functores integrales. Se explican además sus versiones relativas, que se necesitan para precisar la noción de T-dualidad fibrada en variedades de Calabi-Yau elípticas de dimensión tres. Se consideran también varias...
Free field construction of D-branes in rational models of CFT and Gepner models.
Fuchsian groups and uniformization of Hurwitz spaces.
Geometric physics.
Gravity, strings, modular and quasimodular forms
Modular and quasimodular forms have played an important role in gravity and string theory. Eisenstein series have appeared systematically in the determination of spectrums and partition functions, in the description of non-perturbative effects, in higher-order corrections of scalar-field spaces, ...The latter often appear as gravitational instantons i.e. as special solutions of Einstein’s equations. In the present lecture notes we present a class of such solutions in four dimensions, obtained by...
Ground states of supersymmetric matrix models
We consider supersymmetric matrix Hamiltonians. The existence of a zero-energy bound state, in particular for the model, is of interest in M-theory. While we do not quite prove its existence, we show that the decay at infinity such a state would have is compatible with normalizability (and hence existence) in . Moreover, it would be unique. Other values of , where the situation is somewhat different, shall also be addressed. The analysis is based on a Born-Oppenheimer approximation. This seminar...
Instantons, topological strings, and enumerative geometry.
Integrable string models in terms of chiral invariants of groups.