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We study the structure of Brownian loop-soup clusters in two dimensions. Among other things, we obtain the following decomposition of the clusters with critical intensity: When one conditions a loop-soup cluster by its outer boundary…

Probability · Mathematics 2020-02-14 Wei Qian , Wendelin Werner

We show that if one conditions a cluster in a Brownian loop-soup $L$ (of any intensity) in a two-dimensional domain by a portion $l$ of its outer boundary, then in the remaining domain, the union of all the loops of $L$ that touch $l$…

Probability · Mathematics 2018-11-13 Wei Qian

We define and study a set of operators that compute statistical properties of the Brownian Loop Soup, a conformally invariant gas of random Brownian loops (Brownian paths constrained to begin and end at the same point) in two dimensions. We…

Mathematical Physics · Physics 2016-01-20 Federico Camia , Alberto Gandolfi , Matthew Kleban

The two-dimensional Brownian loop-soup is a Poissonian random collection of loops in a planar domain with an intensity parameter c. When c is not greater than 1, we show that the outer boundaries of the loop clusters are disjoint simple…

Probability · Mathematics 2011-09-29 Scott Sheffield , Wendelin Werner

We derive an intensity doubling feature of critical Brownian loop-soups on the cable-graphs of ${\mathbb Z}^d$ for $d \ge 7$ that can be described as follows: In the box $[-N, N]^d$ (and with a probability that goes to $1$ as $N$ goes to…

Probability · Mathematics 2026-03-20 Titus Lupu , Wendelin Werner

We develop a unified approach to establish the non-existence of three types of random fractals: (1) the pioneer triple points of the planar Brownian motion, answering an open question in [7], (2) the pioneer double cut points of the planar…

Probability · Mathematics 2026-04-29 Yifan Gao , Xinyi Li , Runsheng Liu , Wei Qian

For a Brownian loop soup with intensity $c\in(0,1]$ in the unit disk, we show that almost surely, the set of simple (resp. double) points on any portion of boundary of any of its clusters has Hausdorff dimension $2-\xi_c(2)$ (resp.…

Probability · Mathematics 2025-05-13 Yifan Gao , Xinyi Li , Wei Qian

We study vertex-like operators built from the Brownian loop soup in the limit as the loop soup intensity tends to infinity. More precisely, following Camia, Gandolfi and Kleban (Nuclear Physics B 902, 2016), we take a Brownian loop soup in…

Probability · Mathematics 2021-01-01 Federico Camia , Alberto Gandolfi , Giovanni Peccati , Tulasi Ram Reddy

We establish up-to-constants estimates for arm events in the Brownian loop soup on the 2D metric graph associated with the square lattice. More specifically, we consider two natural geometric events: first, ``bulk'' four-arm events,…

Probability · Mathematics 2025-09-30 Yijie Bi , Yifan Gao , Pierre Nolin , Wei Qian

We study Brownian loop soup clusters in $\mathbb{R}^3$ for an arbitrary intensity $\alpha>0$. We show the existence of a phase transition for the presence of unbounded clusters and study its basic properties. In particular, we show that,…

Probability · Mathematics 2026-01-29 Antoine Jego , Titus Lupu

We consider the random field defined by the layering numbers of the Brownian loop soup in a bounded simply connected domain in the complex plane. We call this the layering field and show that, after a suitable renormalization, it converges…

Probability · Mathematics 2025-10-28 Sayantan Maitra

We define a large new class of conformal primary operators in the ensemble of Brownian loops in two dimensions known as the ``Brownian loop soup,'' and compute their correlation functions analytically and in closed form. The loop soup is a…

Mathematical Physics · Physics 2020-07-07 Valentino F. Foit , Matthew Kleban

We compute analytically and in closed form the four-point correlation function in the plane, and the two-point correlation function in the upper half-plane, of layering vertex operators in the two dimensional conformally invariant system…

Mathematical Physics · Physics 2020-08-26 Federico Camia , Valentino F. Foit , Alberto Gandolfi , Matthew Kleban

We study the clusters of loops in a Brownian loop soup in some bounded two-dimensional domain with subcritical intensity $\theta \in (0,1/2]$. We obtain an exact expression for the asymptotic probability of the existence of a cluster…

Probability · Mathematics 2025-11-17 Antoine Jego , Titus Lupu , Wei Qian

We introduce a natural "massive" version of the Brownian loop soup of Lawler and Werner which displays conformal covariance and exponential decay. We show that this massive Brownian loop soup arises as the near-critical scaling limit of a…

Probability · Mathematics 2016-02-12 Federico Camia

We construct a measure on the thick points of a Brownian loop soup in a bounded domain D of the plane with given intensity $\theta>0$, which is formally obtained by exponentiating the square root of its occupation field. The measure is…

Probability · Mathematics 2023-07-27 Élie Aïdékon , Nathanaël Berestycki , Antoine Jego , Titus Lupu

The main topic of these lecture notes is the continuum scaling limit of planar lattice models. One reason why this topic occupies an important place in the theory of probability and mathematical statistical physics is that scaling limits…

Probability · Mathematics 2016-02-12 Federico Camia

For random collections of self-avoiding loops in two-dimensional domains, we define a simple and natural conformal restriction property that is conjecturally satisfied by the scaling limits of interfaces in models from statistical physics.…

Probability · Mathematics 2017-07-18 Scott Sheffield , Wendelin Werner

In this work, which is the first part of a series of two papers, we study the random walk loop soup in dimension two. More specifically, we estimate the probability that two large connected components of loops come close to each other, in…

Probability · Mathematics 2024-09-25 Yifan Gao , Pierre Nolin , Wei Qian

The Brownian loop soup introduced in Lawler and Werner (2004) is a Poissonian realization from a sigma-finite measure on unrooted loops. This measure satisfies both conformal invariance and a restriction property. In this paper, we define a…

Probability · Mathematics 2007-05-23 Gregory F. Lawler , José A. Trujillo Ferreras
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