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Marra, Valerio (2008) A Back-Reaction Approach to Dark Energy. [Ph.D. thesis]

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Abstract (english)

This thesis is mainly about how to set up and carry out in a physically meaningful way the idea of back-reaction, which is an alternative theory to a theory where dark energy is fundamental.
There are, broadly speaking, two distinct approaches. One is focused on how cosmological observables are affected by inhomogeneities, while the other is focused on a theoretical description of the inhomogeneous universe by means of a mean-field description. Both approaches, however, share the idea of smoothing out inhomogeneities. We developed this duality in the interpretation of the back-reaction by means of toy models based on the Lemaitre-Tolman-Bondi solution of Einstein's equations.

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EPrint type:Ph.D. thesis
Tutor:Matarrese, Sabino and Masiero, Antonio
Ph.D. course:Ciclo 20 > Scuole per il 20simo ciclo > FISICA
Data di deposito della tesi:2008
Anno di Pubblicazione:2008
Key Words:back-reaction, backreaction, dark energy, inhomogeneous cosmological model, Lemaitre, Tolman, Bondi, swiss cheese
Settori scientifico-disciplinari MIUR:Area 02 - Scienze fisiche > FIS/05 Astronomia e astrofisica
Struttura di riferimento:Dipartimenti > Dipartimento di Fisica e Astronomia "Galileo Galilei"
Codice ID:588
Depositato il:29 Sep 2008
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