Strong semiclassical gravity in the universe and the laboratory

Orlandi, Alessio (2012) Strong semiclassical gravity in the universe and the laboratory, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Fisica, 24 Ciclo. DOI 10.6092/unibo/amsdottorato/4299.
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Three published papers are resumed in this thesis. Different aspects of the semiclassical theory of gravity are discussed. In chapter 1 we find a new perturbative (yet analytical) solution to the unsolved problem of the metric junction between two Friedmann-Robertson-Walker using Israel's formalism. The case of an expanding radiation core inside an expanding or collapsing dust exterior is treated. This model can be useful in the "landscape" cosmology in string theory or for treating new gravastar configurations. In chapter 2 we investigate the possible use of the Kodama vector field as a substitute for the Killing vector field. In particular we find the response function of an Unruh detector following an (accelerated) Kodama trajectory. The detector has finite extension and backreaction is considered. In chapter 3 we study the possible creation of microscopic black holes at LHC in the brane world model. It is found that the black hole tidal charge has a fundamental role in preventing the formation of the horizon.

Tipologia del documento
Tesi di dottorato
Orlandi, Alessio
Dottorato di ricerca
Scuola di dottorato
Scienze matematiche, fisiche ed astronomiche
Settore disciplinare
Settore concorsuale
Parole chiave
general relativity, semiclassical gravity, Israel's foramalism, metric junction, Unruh effect, Kodama vector, brane world, LHC, black holes
Data di discussione
16 Marzo 2012

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