Sökning: "Non-trivial"

Visar resultat 1 - 5 av 182 avhandlingar innehållade ordet Non-trivial.

1. 1. Strings, Branes and Non-trivial Space-times

   Författare :Jonas Björnsson; Stephen Hwang; Ioannis Bakas; Karlstads universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; String theory; Membranes; BRST; p -branes; p -branes; Non-compact backgrounds; WZNW-model; No-ghost theorem; Unitarity; Hermitian symmetric spaces; CFT; Physics; Fysik; Physics; Fysik;

   Sammanfattning : This thesis deals with different aspects of string and /p/-brane theories. One of the motivations for string theory is to unify the forces in nature and produce a quantum theory of gravity. /p/-branes and related objects arise in string theory and are related to a non-perturbative definition of the theory. LÄS MER

3. 2. Strings, Branes and Non-trivial Space-times

   Författare :Jonas Björnsson; Karlstads universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

   Sammanfattning : .... LÄS MER

4. 3. Consequences of a non-trivial band-structure topology in solids : Investigations of topological surface and interface states

   Författare :Magnus H. Berntsen; Oscar Tjernberg; Philip Hofmann; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; spin- and angle-resolved photoelectron spectroscopy; time-of-flight analyzer; laser based light source; topological insulator; topological crystalline insulator; thin films; surface state; interface state; Bi2Se3; Pb1-xSnxSe;

   Sammanfattning : The development and characterization of experimental setups for angle-resolved photoelectron spectroscopy (ARPES) and spin- and angle-resolved photoelectron spectroscopy (SARPES) is described. Subsequently, the two techniques are applied to studies of the electronic band structure in topologically non-trivial materials. LÄS MER

5. 4. Programming in Martin-Löf Type Theory: Unification - A non-trivial Example

   Författare :Ana Bove; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : .... LÄS MER

7. 5. Maximally Supersymmetric Models in Four and Six Dimensions

   Författare :Fredrik Ohlsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Taub-NUT space; Flat connections; Topologically non-trivial connections; 0 theory; Maximal supersymmetry; 2; Circle fibrations; Yang-Mills theory;

   Sammanfattning : We consider two examples of maximally supersymmetric models; the N=4 Yang-Mills theory in four dimensions and the (2,0) theory in six dimensions. The first part of the thesis serves as an introduction to the topics covered in the appended research papers, and begins with a self-contained discussion of principal fibre bundles and symplectic geometry. LÄS MER