Gaussian multiplicative chaos and KPZ duality

Julien Barral (1) , Xiong Jin (2) , Rémi Rhodes (3) , Vincent Vargas (3)

1 LAGA - Laboratoire Analyse, Géométrie et Applications
2 Mathematics Institute
3 CEREMADE - CEntre de REcherches en MAthématiques de la DEcision

This paper is concerned with the construction of atomic Gaussian multiplicative chaos and the KPZ formula in Liouville quantum gravity. On the first hand, we construct purely atomic random measures corresponding to values of the parameter $\gamma^2$ beyond the transition phase (i.e. $\gamma^2>2d$) and check the duality relation with sub-critical Gaussian multiplicative chaos. On the other hand, we give a simplified proof of the classical KPZ formula as well as the dual KPZ formula for atomic Gaussian multiplicative chaos. In particular, this framework allows to construct singular Liouville measures and to understand the duality relation in Liouville quantum gravity.

Mots clés: Gaussian multiplicative chaos; KPZ formula; duality; Liouville quantum gravity; Gaussian free field; Hausdorff dimension; atomic measure

Domaines: Probabilités [math.PR]; Physique mathématique [math-ph]

Julien Barral, Xiong Jin, Rémi Rhodes, Vincent Vargas. Gaussian multiplicative chaos and KPZ duality. 2012. ⟨hal-00673629v3⟩