Sökning: "Topological Field Theory"

Visar resultat 11 - 15 av 50 avhandlingar innehållade orden Topological Field Theory.

  1. 11. Conformal Field Theory and the Holgoraphic Principle

    Författare :Jens Fjelstad; Örebro universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Sammanfattning : This thesis is based on five research papers with string theory as the least common denominator. The text is divided in two parts. The first part is an introduction to the constructions used in the papers; string theory, conformal field theory, topological field theory and three-dimensional gravity. LÄS MER

  3. 12. Topological Phase Transitions in Magnetic Nanostructures of Dirac Materials

    Författare :Nezhat Pournaghavi; Carlo M. Canali; Michael Flatté; Linnéuniversitetet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Topological insulators; Magnetic materials; Quantum anomalous Hall effect; Topological magneto electric effect; Dirac semimetals; Weyl semimetals; Condensed Matter Physics; Kondenserade materians fysik;

    Sammanfattning : Over the past two decades, the discovery of topological Dirac materials, such as topological insulators and semimetals, has defined a new paradigm in condensed matter physics and established new platforms for realizing spin electronic devices and quantum computing. The novel quantum properties of these materials, which are mainly due to the presence of strong spin-orbit coupling, are invariant under topological transformations, making them more resilient to structural disorder, electromagnetic and thermal fluctuations in comparison to the conventional silicon-based materials. LÄS MER

  4. 13. LOST IN LOCALISATION searching for exact results in supersymmetric gauge theories

    Författare :Louise Anderson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Extended Supersymmetry; Matrix Models; Large N-techniques; Supersymmetric Gauge Theory; Localisation; Topological Field Theory;

    Sammanfattning : This thesis deals with one of the very basics of theoretical physics: computing observable quantities. In the language commonly used to describe the subatomic world, gauge theories, this problem is far from trivial as the observables are expressed in terms of infinite-dimensional integrals. LÄS MER

  5. 14. Supersymmetric Localization : A Journey from Seven to Three Dimensions

    Författare :Konstantina Polydorou; Guido Festuccia; Elli Pomoni; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Supersymmetry; Localization; Equivariant Cohomology; BPS Operators; Topological Field Theory; Equivariant Twisting; Theoretical Physics; Teoretisk fysik;

    Sammanfattning : Quantum Field Theory has been a dominating framework in elementary particle physics during the last century. Within this framework, supersymmetric theories have attracted a lot of attention due to their mathematical structure, simplicity and insight into the problems of unification, dark matter and hierarchy. LÄS MER

  7. 15. Multicomponent superconductivity : Vortex matter and phase transitions

    Författare :Johan Carlström; Egor Babaev; Leo Radzihovsky; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Superconductivity; Ginzburg Landau; field theory; Iron pnictide;

    Sammanfattning : The topic of this thesis is vortex-physics in multi component Ginzburg- Landau models. These models describe a newly discovered class of super- conductors with multiple superconducting gaps, and possess many properties that set them apart from single component models. LÄS MER