Ben Lees

University of Bristol

Monotonicity of correlations for general loop soups

Probability Seminar

4th October 2019, 3:30 pm – 4:30 pm
Fry Building, LG.22

Loop soup models involve one dimensional objects (loops/walks/dimers) living in a higher dimensional space. These models are connected to various spin and particle systems from statistical mechanics.

A general loop soup model on $\mathbb Z^d$ lattice will be introduced and specific cases corresponding to models such as the $O(N)$-loop and -spin model, the dimer and double dimer model, and spatial random permutations will be explained.

We will see a general monotonicity result for correlations in this model and, in the special case of the $O(N)$-spin model it will be shown that this provides a proof of monotonicity for two point correlations as a function of the distance between particles, providing a positive answer to a well-accepted conjecture in the case $N\geq 3$.

Organisers: Jessica Jay, Elnur Emrah

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