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University of Cambridge > Talks.cam > Isaac Newton Institute Seminar Series > Lecture 2 - The interacting dimer model

## Lecture 2 - The interacting dimer modelAdd to your list(s) Download to your calendar using vCal - Fabio Toninelli (Université Claude Bernard Lyon 1)
- Wednesday 10 October 2018, 15:30-17:00
- Seminar Room 2, Newton Institute.
If you have a question about this talk, please contact info@newton.ac.uk. SRQ - Scaling limits, rough paths, quantum field theory The aim of this minicourse is to present recent results, obtained together with Vieri Mastropietro (arXiv:1406.7710 and arXiv:1612.01274), on non-integrable perturbations of the classical dimer model on the square lattice. In the integrable situation, the model is free-fermionic and the large-scale fluctuations of its height function tend to a two-dimensional massless Gaussian field (GFF). We prove that convergence to GFF holds also for sufficiently small non-integrable perturbations. At the same time, we show that the dimer-dimer correlations exhibit non-trivial critical exponents, continuously depending upon the strength of the interaction: the model belongs, in a suitable sense, to the `Luttinger liquid' universality class. The proofs are based on constructive Renormalization Group for interacting fermions in two dimensions. Contents: 1. Basics: the model, height function, interacting dimer model. The main results for the interacting model: GFF fluctuations and Haldane relation. 2. The non-interacting dimer model: Kasteleyn theory, thermodynamiclimit, long-distance asymptotics of correlations, GFF fluctuations. Fermionic representation of the non-interacting and of the interacting dimer model. 3. Multi-scale analysis of the free propagator, Feynman diagrams and dimensional estimates. Determinant expansion. Non-renormalized multiscale expansion. 4. Renormalized multiscale expansion. Running coupling constants. Beta function. 5. The reference continuum model (the `infrared fixed point'): the Luttinger model. Exact solvability of the Luttinger model. Bosonization. 6. Ward identities and anomalies. Schwinger-Dyson equation. Closed equation for the correlation functions. Comparison of the lattice model with the reference one. This talk is part of the Isaac Newton Institute Seminar Series series. ## This talk is included in these lists:- All CMS events
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