Projects per year

## Personal profile

### Research interests

**Disordered** **systems.** My main interest is in developing analytical methods for the study of localisation phenomena. This interest spills over neighbouring areas, for instance the spectral theory of operators, random matrices and random walks on Lie groups.

**Ph.D. Projects. **I am happy to supervise capable and motivated graduate students to work on the following projects.

**Representation Theory and products of random matrices. **In recent work with Alain Comtet, Jean-Marc Luck and Christophe Texier, we were able to calculate explicitly the Lyapunov exponent of a general product of random matrices in the group SL(2,R) in a certain "scaling limit" as the matrices in the product tend to the identity element. We found that the Lyapunov exponent is expressible in terms of hypergeometric functions. In his celebrated book "Special Functions and Representation Theory", Vilenkin showed that the hypergeometric functions were intimately related to the irreducible unitary representations of SL(2,R). The aim of the project is to reformulate our findings in terms of these representations, and thus to enable the analytical treatment of other groups.

**Fluctuations in impurity models. **Impurity models are particular disordered systems that can be formulated in terms of products of random matrices. The behaviour of these products as the number of elements in the products grows may be described by means of a "Central Limit Theorem" where the "mean" is the Lyapunov exponent, and where the "variance" quantifies the fluctuations of the product about the "mean". In recent years, much progress has been made in developing methods for the explicit calculation of the Lyapunov exponent. The aim of the project is to generalise these tools to the calculation of other "moments".

## Fingerprint Dive into the research topics where Yves J M Tourigny is active. These topic labels come from the works of this person. Together they form a unique fingerprint.

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## Projects

- 4 Finished

## Research Output

## Impurity models and products of random matrices

Comtet, A. & Tourigny, Y., 10 Aug 2017,*Stochastic Processes and Random Matrices: Lecture Notes of the Les Houches Summer School 2015.*Schehr, G., Altland, A., Fyodorov, Y. V., O'Connell, N. & Cugliandolo, L. F. (eds.). Oxford: Oxford University Press, Vol. 104. 71 p. (Lecture Notes of the Les Houches Summer School).

Research output: Chapter in Book/Report/Conference proceeding › Chapter in a book

## Explicit formulae in probability and in statistical physics

Tourigny, Y. & Comtet, A., 7 Sep 2015,*In Memoriam Marc Yor--Seminaire de Probabilites XLVII: Lecture Notes in Mathematics.*Donati-Martin, C. & Rouault, A. (eds.). Springer, Vol. 2137. p. 505-519 15 p. (Lecture Notes in Mathematics).

Research output: Chapter in Book/Report/Conference proceeding › Chapter in a book

## One-Dimensional Disordered Quantum Mechanics and Sinai Diffusion with Random Absorbers

Grabsch, A., Texier, C. & Tourigny, Y. J. M., Apr 2014, In : Journal of Statistical Physics. 155, 2, p. 237–276 40 p.Research output: Contribution to journal › Article (Academic Journal)