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Identifier	000402029
Title	Probing dark energy with cosmic structures
Alternative Title	Μελέτη της κοσμικής ενέργειας με κοσμικές δομές
Author	Τανογλίδης, Δημήτριος Δ.
Thesis advisor	Παυλίδου, Βασιλική
Reviewer	Τομαράς, Θεόδωρος Τάσσης, Κωνσταντίνος
Abstract	The presence of a dark energy component in the Universe has a profound effect on the evolution of cosmic structure: acting as anti-gravity, halts structure growth. In the present work we use this effect to probe dark energy. We propose the turnaround radius of cosmic structures as the optimum observable quantity where the effect of dark energy is imprinted. We consider the standard ΛCDM cosmology (where the dark energy behaves as a cosmological constant) and cosmologies with a dark energy with a more general equation of state parameter, w. We demonstrate that, in the context of the ΛCDM model, it is in principle possible to measure the value of the cosmological constant by tracing, across cosmic time, the evolution of the turnaround radius of cosmic structures. The novelty of the presented method is that it is local, in the sense that it uses the effect of the cosmological constant on the relatively short scales of cosmic structures and not on the dynamics of the Universe at its largest scales. In this way, it can provide an important consistency check for the standard cosmological model and can give signs of new physics, beyond ΛCDM. We extend the method for a more general equation of state parameter, w, and we show that the evolution of turnaround radius depends clearly on it, and thus can be used to constrain it.
Language	English
Issue date	2016-07-22
Collection	School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
	Type of Work--Post-graduate theses
Permanent Link	https://elocus.lib.uoc.gr//dlib/5/4/5/metadata-dlib-1467967457-923896-19256.tkl
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