Sökning: "loop quantum gravity"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden loop quantum gravity.

1. 1. Stringed along or caught in a loop? : Philosophical reflections on modern quantum gravity research

   Författare :Keizo Matsubara; Lars-Göran Johansson; Holger Lyre; Uppsala universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; quantum gravity; string theory; loop quantum gravity; philosophy of physics; philosophy of science; scientific realism; structural realism; multiverse; thought experiments; Theoretical Philosophy; Teoretisk filosofi;

   Sammanfattning : A number of philosophical questions, all connected to modern research in quantum gravity, are discussed in this dissertation.The goal of research in quantum gravity is to find a quantum theory for gravitation; the other fundamental forces are already understood in terms of quantum physics. LÄS MER

3. 2. Topics on D-branes and Holography

   Författare :Mikael Smedbäck; Joseph Minahan; Anton Alekseev; Paolo Di Vecchia; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Theoretical physics; theoretical physics; string theory; D-branes; dualities; AdS CFT; spin chains; Bethe ansatz; boundary conformal field theory; conformal bootstrap; tachyon condensation; string field theory; loop quantum gravity; black holes; area spectrum; Hawking radiation; holographic principle; Teoretisk fysik; Physics; Fysik;

   Sammanfattning : We discuss various aspects of D-branes in string theory and holography in string theory and loop quantum gravity.One way to study D-branes is from a microscopic perspective, using conformal field theory techniques. For example, we investigate the question of how D-branes can be introduced into orbifolded theories. LÄS MER

4. 3. Classical Aspects on the Road to Quantum Gravity: A Study in the Framework of the New Variables

   Författare :Ola Boström; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : There has been a lot of progress in the quest for the structure of spacetime since a canonical non-perturbative quantization program for general relativity was set up ten years ago. The crucial ideas are two choices of coordinates on phase space. LÄS MER

5. 4. Color-Kinematics Duality and Gravitational Waves

   Författare :Maor Ben-Shahar; Henrik Johansson; Jan Plefka; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Quantum field theory; gravitational waves; scattering amplitudes; Theoretical Philosophy; Teoretisk filosofi;

   Sammanfattning : Recent developments in theoretical physics have led to new insights for gauge theory and gravity scattering amplitudes.The color-kinematics duality, in particular, describes an intriguing set of identities obeyed by the kinematic numerators of gauge-theory scattering amplitudes, mirroring the Jacobi identity of the color factors. LÄS MER

7. 5. Cosmoparticle Physics and String Theory

   Författare :Stefan Sjörs; Marcus Berg; Joseph Conlon; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Supersymmetry; dark matter; cosmology; inflation; modifications of gravity; string theory; flux compactifications; perturbative string theory; teoretisk fysik; Theoretical Physics;

   Sammanfattning : This thesis deals with phenomenological and theoretical aspects of cosmoparticle physics and string theory. There are many open questions in these topics. In connection with cosmology we would like to understand the detailed properties of dark matter, dark energy, generation of primordial perturbations, etc. LÄS MER