Graduate theses
Current Record: 168 of 179
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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
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Τανογλίδης, Δημήτριος Δ.
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Thesis advisor
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Παυλίδου, Βασιλική
Τομαράς, Θεόδωρος
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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.
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Language |
Greek |
Subject |
Inhomogeneous universe |
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Linear theory |
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Mass functions |
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Spherical collapse model |
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Statistical treatment |
Issue date |
2014-07-25 |
Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
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Type of Work--Graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/8/8/4/metadata-dlib-1404282545-434724-31515.tkl
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Views |
432 |