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Random geometry and non-unitary quantum field theories.

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Prochain Séminaire de la FIP :
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Stages L3
Stages M1 ICFP

Actualités : Séminaire de Recherche ICFP
du 14 au 18 novembre 2022 :

Retrouvez le programme complet

Contact - Secrétariat de l’enseignement :
Tél : 01 44 32 35 60
enseignement@phys.ens.fr

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Faculty : Jesper Jacobsen

ECTS credits : 3

Language of instruction : English

Examination :

Description :

This course is an introduction to random geometrical critical phenomena and their description using algebraic, probabilistic and quantum field theoretical techniques. The main objects of study are conformally invariant extended objects, such as percolation clusters, domain walls in spin systems, and self-avoiding walks. We wish to describe these objects as precisely as possible, via critical exponents and correlation functions. A substantial part of the work takes place in two dimensions, but some of the techniques can be pushed to higher dimensions as well.

After introducing the geometrical objects and their phenomenology, we describe their relations to lattice models of loops and spins. In the continuum limit we make contact with a variant of Liouville quantum field theory and other results from high-energy physics. The study of two, three and four-point correlation functions calls for ideas of fusion and conformal bootstrap. Another angle of attack is provided by probabilistic approaches, such as Stochastic Loewner Evolution (SLE) and its variants. Crucial algebraic insight is obtained by identifying the algebraic symmetries of the models, both in the lattice description (affine Temperley-Lieb algebra) and in the continuum limit (interchiral conformal symmetry). In many cases of physical interest the corresponding representations are indecomposable, so that correlation functions are described by logarithmic conformal field theories.

Accès rapides

Prochain Séminaire de la FIP :
Accéder au programme

Retrouvez toutes les informations pour vos stages :
Stages L3
Stages M1 ICFP

Actualités : Séminaire de Recherche ICFP
du 14 au 18 novembre 2022 :

Retrouvez le programme complet

Contact - Secrétariat de l’enseignement :
Tél : 01 44 32 35 60
enseignement@phys.ens.fr

r>