Sökning: "NATURAL SCIENCES Physics Other physics Mathematical physics"

Visar resultat 16 - 20 av 152 avhandlingar innehållade orden NATURAL SCIENCES Physics Other physics Mathematical physics.

1. 16. Aspects of Wrapped Branes in String and M-Theory

   Författare :Ling Bao; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Instantons; Algebraic symmetries; String theory;

   Sammanfattning : This thesis consists of an introductory text together with five appended research papers. The Ariadne's thread through the whole thesis is various effects coming from high-dimensional p-branes in various subsectors of string and M-theory. LÄS MER

3. 17. Pierced, Wrapped and Torn : Aspects of String Theory Compactifications

   Författare :Magdalena Larfors; Ulf Danielsson; Gary Shiu; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematical physics; Matematisk fysik; Theoretical Physics; teoretisk fysik;

   Sammanfattning : An outstanding problem in physics is to find a unified framework for quantum mechanics and general relativity. This is required for a better understanding of black holes and the early cosmology of the universe. String theory provides such a unification. In this thesis, we study aspects of compactifications of type IIB string theory. LÄS MER

4. 18. Making Maps and Keeping Logs : Quantum Gravity from Classical Viewpoints

   Författare :Niklas Johansson; Ulf Danielsson; Jan de Boer; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; String theory; black holes in string theory; Calabi-Yau geometry; flux compactifications; three-dimensional gravity; Mathematical physics; Matematisk fysik; Theoretical Physics; teoretisk fysik;

   Sammanfattning : This thesis explores three different aspects of quantum gravity. First we study D3-brane black holes in Calabi-Yau compactifications of type IIB string theory. Using the OSV conjecture and a relation between topological strings and matrix models we show that some black holes have a matrix model description. LÄS MER

5. 19. Development and application of Muffin-Tin Orbital based Green’s function techniques to systems with magnetic and chemical disorder

   Författare :Andreas Kissavos; Igor Abrikosov; Hubert Ebert; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematical physics; Theoretical Physics; Muffin-Tin Orbital method; Calculations; Magnetism; Lloyd’s formula; Mathematical physics; Matematisk fysik;

   Sammanfattning : Accurate electronic structure calculations are becoming more and more important because of the increasing need for information about systems which are hard to perform experiments on. Databases compiled from theoretical results are also being used more than ever for applications, and the reliability of the theoretical methods are of utmost importance. LÄS MER

7. 20. Spins and Giants : Fundamental Excitations in Weakly and  Strongly Coupled ABJM Theory

   Författare :Olof Ohlsson Sax; Joseph A. Minahan; Gianluca Grignani; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; String theory; AdS CFT correspondence; Integrable field theory; Mathematical physics; Matematisk fysik; Theoretical Physics; Teoretisk fysik;

   Sammanfattning : The discovery of integrability on both sides of the duality between planar N=4 super Yang-Mills theory and free type IIB string theory in AdS5 × S5 has lead to great progress in our understanding of the AdS/CFT correspondence. Similar integrable structures also appear in the more recent three-dimensional superconformal N=6 Chern-Simons-matter theory constructed by Aharony, Bergman, Jafferis and Maldacena (ABJM), as well as in its gravity dual, type IIA string theory on AdS4 × CP3. LÄS MER