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EnglishThis 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.
A Back-Reaction Approach to Dark Energy / Marra, Valerio. - (2008).
| Titolo: | A Back-Reaction Approach to Dark Energy | |
| Autori: | ||
| Data di pubblicazione: | 2008 | |
| Citazione: | A Back-Reaction Approach to Dark Energy / Marra, Valerio. - (2008). | |
| Abstract: | 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. | |
| Handle: | http://hdl.handle.net/11577/3425542 | |
| Appare nelle tipologie: | 08.01 - Tesi di Dottorato UNIPD (Deposito Legale) |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| 0803.3152v3.pdf | Tesi di dottorato | Non specificato | Open Access Visualizza/Apri |
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