## Stochastic Analysis Common-Leonid Petrov (Northeastern University)-Random 3D surfaces and their asymptotic behavior

Mathematics - Lecture/Discussion

Monday, December 9, 2013

4:00 PM-5:00 PM

Stratton Hall

202

ABSTRACT: I will discuss the probabilistic model of randomly tiling a hexagon drawn on the regular triangular lattice by lozenges of three types (equivalent formulations: dimer models on the honeycomb lattice, or random 3D stepped surfaces glued out of 1x1x1 boxes). This model has received a significant attention over the past 20 years (first results - the computation of the partition function - date back to P. MacMahon, 100+ years ago). Kenyon, Okounkov, and their co-authors (1998-2007)proved the law of large numbers: when the polygon is fixed and the mesh of the lattice goes to zero, the random 3D surface concentrates around a deterministic limit shape, which is algebraic. I will discuss finer asymptotics: local geometry, behavior of interfaces between phases (which manifests the Kardar-Parisi-Zhang universality), and global fluctuations of random surfaces (described by the Gaussian Free Field), as well as dynamical models associated with random tilings.

Suggested Audiences:
Adult, College

E-mail:
ma-chair@wpi.edu

Last Modified: November 26, 2013 at 2:56 PM

## Stochastic Analysis Common-Leonid Petrov (Northeastern University)-Random 3D surfaces and their asymptotic behavior

Mathematics - Lecture/Discussion

Monday, December 9, 2013

4:00 PM-5:00 PM

Stratton Hall

202

ABSTRACT: I will discuss the probabilistic model of randomly tiling a hexagon drawn on the regular triangular lattice by lozenges of three types (equivalent formulations: dimer models on the honeycomb lattice, or random 3D stepped surfaces glued out of 1x1x1 boxes). This model has received a significant attention over the past 20 years (first results - the computation of the partition function - date back to P. MacMahon, 100+ years ago). Kenyon, Okounkov, and their co-authors (1998-2007)proved the law of large numbers: when the polygon is fixed and the mesh of the lattice goes to zero, the random 3D surface concentrates around a deterministic limit shape, which is algebraic. I will discuss finer asymptotics: local geometry, behavior of interfaces between phases (which manifests the Kardar-Parisi-Zhang universality), and global fluctuations of random surfaces (described by the Gaussian Free Field), as well as dynamical models associated with random tilings.

Suggested Audiences: Adult, College

E-mail: ma-chair@wpi.edu

Last Modified: November 26, 2013 at 2:56 PM