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Theses

Integrable systems and AdS/CFT duality

Abstract : This thesis is devoted to the study of integrable quantum systems such as spin chains, two-dimensional field theories and the AdS/CFT duality. This AdS/CFT duality is a conjecture, stated in the end of the last century, which relates (for instance) the non- perturbative regime of a superconformal gauge theory (called N =4 super Yang-Mills) and the perturbative regime of a string theory on a 10-dimensional space with the geometry AdS5×S5 . This thesis explores the similarities between integrable spin chains and quantum field theories, such as Super Yang Mills. We first study integrable spin chains and build explicitly a polynomial "Bäcklund flow" and polynomial "Q-operators", which allow to diagonalize the Hamiltonian. We then study integrable field theories et show how to obtain "Q-functions", analogous to the Q-operators built for spin chains. It turns out that several important informations are contained in the analytic properties of these Q-functions. That allows to obtain, in the framework of the thermodynamic Bethe ansatz, a finite number of non-linear integral equations encoding the spectrum of the theory which we study. This system of equations is equivalent to an infinite system of equations, known as "Y-system", which had been quite recently conjectured in the case of the AdS/CFT duality.
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Contributor : Sébastien Leurent <>
Submitted on : Thursday, March 7, 2013 - 12:45:13 PM
Last modification on : Thursday, October 29, 2020 - 3:01:34 PM
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  • HAL Id : tel-00797842, version 1
  • ARXIV : 1206.4061

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Sebastien Leurent. Integrable systems and AdS/CFT duality. High Energy Physics - Theory [hep-th]. Université Pierre et Marie Curie - Paris VI, 2012. English. ⟨tel-00797842⟩

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