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Theses

Gaussian multiplicative chaos and applications to Liouville quantum gravity

Abstract : In this thesis, we study the theory of Liouville Quantum Gravity via probabilist approach, introduced in the seminal paper of Polyakov in 1981, using path integral formalism on 2d surfaces. To define this path integral with exponential interaction, we started from the theory of Gaussian Multiplicative Chaos in order to define exponential of log-correlated Gaussian fields. In the first part, we generalise the construction of Liouville Quantum Gravity on the Riemann sphere to another geometry, the one of the unit disk. The novelty of this work, in collaboration with R.Rhodes and V.Vargas, is to analyse carefully the boundary term in the path integral formalism and its interaction with the bulk measure. We establish rigorously formulae from Conformal Field Theory in Physics, such as conformal covariance, KPZ relation, conformal anomaly and Seiberg bounds. A relaxed Seiberg bound in the unit volume case of Liouville Quantum Gravity on the disk is also announced and studied. In the second part of this thesis, we compare this construction in the spirit of Polyakov to another approach to the Liouville Quantum Gravity. In collaboration with two other young researchers, J.Aru and X.Sun, we give a correspondance between these two approaches in a simple but conceptually important case, namely the one on the Riemann sphere with three marked points. Using technics coming from these two approches, we give a new way of regularisation procedure that eventually allow us to link these two pictures.
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Yichao Huang. Gaussian multiplicative chaos and applications to Liouville quantum gravity. Complex Variables [math.CV]. Université Pierre et Marie Curie - Paris VI, 2017. English. ⟨NNT : 2017PA066623⟩. ⟨tel-01993869⟩

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