Trieste lectures on solitons in noncommutative Gauge theories
CHAMPS DE JAUGE
PHYSIQUE
SOLITONS
Abstract : We present a pedagogical introduction into noncommutative gauge theories, their stringy origin, and non-perturbative effects, including monopole and instanton solutions.
NEKRASOV
P/02/18
IHES
03/2002
A4
34 f.
EN
TEXTE
PREPUBLICATION
P_02_18.pdf
2002
Milne Universe, Tachyons, and quantum group
MILNE
TACHYONS
THEORIE QUANTIQUE DES CHAMPS
Abstract : We analyze the spectrum of the bosonic and superstring on the orbifold of the space-time by a boost, leading to the cosmological singularity. We show that the modular invariance leads to the spectrum where the twisted sector tachyon, together with all other twisted sector fields, present in the Euclidean version of the orbifold, is absent. This makes impossible to resolve the singularity by a marginal deformation of the worldsheet CFT. We also establish a relation between the resolution of rotational orbifolds in Euclidean and Lorentzian setups, and quantum groups. The analysis confirms the impossibility of resolving the cosmological orbifold singularity.
NEKRASOV
P/02/13
IHES
03/2002
A4
9 f.
EN
TEXTE
PREPUBLICATION
P_02_13.pdf
2002
Noncommutative Field Theory
THEORIE QUANTIQUE DES CHAMPS
ESPACE-TEMPS
CINEMATIQUE
MODELES DES CORDES VIBRANTES
SOLITONS
INSTANTONS
Abstract : We review the generalization of field theory to space-time with noncommuting coordinates, starting with the basics and covering most of the active directions of research. Such theories are now known to emerge from limits of M theory and string theory, and to describe quantum Hall states. In the last few years they have been studied intensively, and many qualitatively new phenomena have been discovered, both on the classical and quantum level.
To appear in Reviews of Modern Physics.
NEKRASOV
DOUGLAS
P/01/27
IHES
06/2001
A4
31 f.
EN
TEXTE
PREPUBLICATION
P_01_27.pdf
2001
Strings and black holes
MODELES DES CORDES VIBRANTES
TROUS NOIRS
DAMOUR
P/99/94
IHES
12/1999
A4
7 f.
EN
TEXTE
PREPUBLICATION
P_99_94.pdf
1999
Self-gravitating fundamental strings and black holes
MODELES DES CORDES VIBRANTES
TROUS NOIRS
GRAVITATION
DAMOUR
VENEZIANO
P/99/54
IHES
07/1999
A4
15 f.
EN
TEXTE
PREPUBLICATION
P_99_54.pdf
1999
Scaling and functional integration. Suivi de Brydges' operator in renormalization theory
INTEGRATION DE FONCTIONS
RENORMALISATION
PHYSIQUE
ESPACE-TEMPS
EQUATIONS AUX DERIVEES PARTIELLES
ESPACES GENERALISES
CARTIER
DEWITT-MORETTE
M/99/51
IHES
07/1999
A4
12 f.
EN
TEXTE
PREPUBLICATION
M_99_51.pdf
1999