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Title: Quantum brane cosmology
Author: Seery, David
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2005
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The cosmological phenomenology of branes is tested, concentrating on quantum mechanical models at all levels. In increasing order of energy, we discuss low-energy observable quantum fields on the brane, higher-energy quantum fields which live in the new bulk space provided by brane scenarios, quantum mechanical models of the brane world itself, and simple phenomenological models of quantum mechanical strings. We calculate radiative gravitational corrections to the mass of a class of light scalar fields, which include the inflation and the quintessence field, and discuss constrains which arise from requiring consistency with observation. We calculate a class of corrections to the quintessence potential, and show that the classical tree-level potential is typically not destroyed by radiative effects. A systematic path integral theory of Kaluza-Klein fields is developed and applied to stationary and ‘breathing’ orbifolds, and in the process we calculate first order corrections to the spectrum of tensor modes produced during an epoch of early universe inflation. We go on to discuss aspects of a quantum cosmology of the braneworld, and describe how the on-brane Wheeler-de Witt equation descends from the bulk quantum constraint. In our formalism, a tower of corrections to the four-dimensional quantum cosmology appears, and we show how this framework directly addresses consistency issues in the brane world. Finally, a simple phenomenological model of quantum mechanical strings stretching across the brane world is introduced. We discuss the low-energy phenomenology, and discuss how such effects may influence dynamical models in which the Hot Big Bang is connected with a collision between branes in the early universe.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available