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Title

An excursion set theory approach to the end of structure formation in ΛCDM cosmology

Alternative Title

Μια μελέτη βασισμένη στη θεωρία τυχαίων βηματισμών του τέλους της δημιουργίας κοσμικών δομών στη ΛCDM κοσμολογία

Author

Τανογλίδης, Δημήτριος Δ.

Thesis advisor

Παυλίδου, Βασιλική
Τομαράς, Θεόδωρος

Abstract

One of the most important consequences of the existence of a dark energy component (in the form of a cosmological constant in the currently accepted _CDM cosmology) in the Universe, lies in the process of structure formation. In such a cosmology some initial overdensities are able to turnaround and collapse to virialized structures, while others are not. Here, after presenting the Excursion Set Theory of mass functions, we use it to obtain the mass function of the turnaround-ed structures in the distant future and we compare it with the mass functions of turnaround-ed and virialized structures in the present cosmological epoch and other cosmological epochs. We also follow structures of various mass scales towards their final number densities. We find a “magical” mass scale, such that, structures with masses greater than that have always greater number density than their final while structures of lower mass have, at least at some time, greater number densities than their final. We conclude that the process of structure formation is nearly completed in the present time. This work comes to complete and to extend similar results obtained from numerical simulations.

Language

Greek

Subject

Inhomogeneous universe

Linear theory

Mass functions

Spherical collapse model

Statistical treatment

Issue date

2014-07-25

Collection

School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses