Search for dissertations about: "integrable"

Showing result 11 - 15 of 51 swedish dissertations containing the word integrable.

  2. 11. Topics in perturbation theory : From IBP identities to integrands

    Author : Alessandro Georgoudis; Joseph A. Minahan; Tristan McLoughlin; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Perturbation theory; Feynman Integrals; Integrable field theories; Correlation functions.; Theoretical Physics; Teoretisk fysik;

    Abstract : In this thesis we present different topics in perturbation theory. We start by introducing the method of integration by parts identities, which reduces a generic Feynman integral to a linear combination of a finite basis of master integrals. READ MORE

  4. 12. Painlevé analysis and transformations for nonlinear partial differential equations

    Author : Ove Lindblom; Luleå tekniska universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Matematik;

    Abstract : Nonlinear partial differential equations play a fundamental role in the description of many physical models. In order to get a complete understanding of the phenomena which are modeled it is important to obtain exact analytic solutions. READ MORE

  5. 13. The Maximum Principle for Cauchy-Riemann Functions and Hypocomplexity

    Author : Abtin Daghighi; Stefan Borell; Christer Kiselman; Egmont Porten; Juergen Leiterer; Mittuniversitetet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Hypocomplexity; hypoanalytic structure; CR functions; maximum principle; weak pseudoconcavity;

    Abstract : This licentiate thesis contains results on the maximum principle forCauchy–Riemann functions (CR functions) on weakly 1-concave CRmanifolds and hypocomplexity of locally integrable structures. Themaximum principle does not hold true in general for smooth CR functions,and basic counterexamples can be constructed in the presenceof strictly pseudoconvex points. READ MORE

  6. 14. Analytic AbC constructions in Hamiltonian dynamics and ergodic theory

    Author : Gerard Farré Puiggalí; Maria Saprykina; Krikorian Raphaël; KTH; []
    Keywords : ;

    Abstract : Denna avhandling innehåller flera resultat angående störning avintegrerbara dynamiska system. De flesta av dessa resultat erhålls genom konstruktiva metoder utvecklade på sjuttiotalet av D. Anosovoch A. Katok inom ergodteorin. READ MORE

  7. 15. On path integral localization and the Laplacian

    Author : Topi Kärki; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Theoretical physics; Teoretisk fysik; Physics; Fysik; Theoretical Physics; teoretisk fysik;

    Abstract : In this thesis, we develop path integral localization methods that are familiar from topological field theory: the integral over the infinite dimensional integration domain depends only on local data around some finite dimensional subdomain.We introduce a new localization principle that unifies BRST localization, the non-Abelian localization principle and the conformal generalization of the Duistermaat-Heckman integration formula. READ MORE