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- W137629079 abstract "In this thesis, we present our work about some generalisations of ideas, techniques and physical interpretations typical for integrable models to one of themost outstanding advances in theoretical physics of nowadays: the AdS/CFT correspondences.We have undertaken the problem of testing this conjectured duality under various points of view, but with a clear starting point - the integrability - and with a clearambitious task in mind: to study the finite-size effects in the energy spectrum of certain string solutions on a side and in the anomalous dimensions of the gaugetheory on the other. Of course, the final desire woul be the exact comparison between these two faces of the gauge/string duality.In few words, the original part of this work consists in application of well known integrability technologies, in large parte borrowed by the study of relativistic(1+1)-dimensional integrable quantum field theories, to the highly non-relativisic and much complicated case of the thoeries involved in the recent conjectures of AdS5/CFT4 and AdS4/CFT3 corrspondences.In details, exploiting the spin chain nature of the dilatation operator of N = 4 Super-Yang-Mills theory, we concentrated our attention on one of the mostimportant sector, namely the SL(2) sector - which is also very intersting for the QCD understanding - by formulating a new type of nonlinear integral equation (NLIE) based on a previously guessed asymptotic Bethe Ansatz. The solutionsof this Bethe Ansatz are characterised by the length L of the correspondent spin chain and by the number s of its excitations. A NLIE allows one, at least in principle, to make analytical and numerical calculations for arbitrary values of these parameters. The results have been rather exciting. In the important regime of high Lorentz spin, the NLIE clarifies how it reduces to a linear integralequations which governs the subleading order in s, o(s0). This also holds in the regime with L ! 1, L/ ln s finite (long operators case). This region of parameters has been particularly investigated in literature especially because of an intriguing limit into the O(6) sigma model defined on the string side.One of the most powerful methods to keep under control the finite-size spectrum of an integrable relativistic theory is the so called thermodynamic Bethe Ansatz (TBA). We proposed a highly non-trivial generalisation of this technique to the non-relativistic case of AdS5/CFT4 and made the first steps in order to determineits full spectrum - of energies for the AdS side, of anomalous dimensions for the CFT one - at any values of the coupling constant and of the size.At the leading order in the size parameter, the calculation of the finite-size corrections is much simpler and does not necessitate the TBA. It consists in derivingfor a nonrelativistc case a method, invented for the first time by L¨uscher to compute the finite-size effects on the mass spectrum of relativisic theories. So, wehave formulated a new version of this approach to adapt it to the case of recently found classical string solutions on AdS4 × CP3, inside the new conjecture of anAdS4/CFT3 correspondence. Our results in part confirm the string and algebraic curve calculations, in part are completely new and then could be better understoodby the rapidly evolving developments of this extremely exciting research field." @default.
- W137629079 created "2016-06-24" @default.
- W137629079 creator A5065226729 @default.
- W137629079 date "2009-04-28" @default.
- W137629079 modified "2023-09-24" @default.
- W137629079 title "Aspects of Integrability in Gauge/String Correspondence" @default.
- W137629079 hasPublicationYear "2009" @default.
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