Astrophysical and Cosmological Consequences of the Dynamical Localization of Gravity
| dc.creator | Germani, Cristiano | |
| dc.date | 2003-11-24 | |
| dc.date | 2003-12-11 | |
| dc.date.accessioned | 2026-07-07T04:16:14Z | |
| dc.date.available | 2026-07-07T04:16:14Z | |
| dc.description | In this thesis I review cosmological and astrophysical exact models for Randall-Sundrum-type braneworlds and their physical implications. I present new insights and show their analogies with quantum theories via the holographic idea. In astrophysics I study the two fundamental models of a spherically symmetric static star and spherically symmetric collapsing objects. I show how matching for the pressure of a static star encodes braneworld effects. In addition I study the problem of the vacuum exterior conjecturing a uniqueness theorem. Furthermore I show that a collapsing dust cloud in the braneworld has a non-static exterior, in contrast to the General Relativistic case. This non-static behaviour is linked to the presence of a "surplus potential energy" that must be released, producing a non-zero flux of energy. Via holography this can be connected with the Hawking process, giving an indirect measure of the brane tension. In cosmology I investigate the generalization of the Randall-Sundrum-type model obtained by introducing the Gauss-Bonnet combination into the action. I elucidate the junction conditions necessary to study the brane model and obtain the cosmological dynamics, showing that, even in the thin shell limit for the brane, the Gauss-Bonnet term implies a non-trivial internal structure for the matter and geometry distributions. Independently of the gravitational theory used, I show how to derive the modified Friedman equation and how it is related to the black hole solution of the theory. Via holography I also show how to interpret quantum mechanically the mass of this black hole from a four-dimensional perspective in the simplest Randall-Sundrum-type scenario. | |
| dc.description | PhD thesis, ICG University of Portsmouth (UK); 106+14 pages, 5 figures; v2 reference added | |
| dc.identifier | https://arxiv.org/abs/hep-th/0311230 | |
| dc.identifier | http://arxiv.org/abs/hep-th/0311230 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/52271 | |
| dc.subject | High Energy Physics - Theory | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.title | Astrophysical and Cosmological Consequences of the Dynamical Localization of Gravity | |
| dc.type | text |