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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:08 |
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Conference: Bucharest University Faculty of Physics 2004 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
Hypothesis concerning the nature of dark matter
Authors:
Sinziana Paduroiu, Mircea Rusu
Affiliation:
Faculty of Physics, Atomic and Nuclear Physics Dept., Bucharest University
E-mail
Keywords:
dark matter; cosmology; astrophysics
Abstract:
In this paper we briefly review the main observational facts that lead to the hypothesis of the so called “dark matter” as a considerable part of the matter in the Universe that is not visible. The expansion rate of the universe, the birth of the galaxies and their rotation curves are some of the things that can be explained by the existence of dark matter.
Generally, there are two models for dark matter: the hot dark matter (HDM) model and the cold dark matter one (CDM). In this paper we will refer mainly to the cold dark matter model.
Will be discussed two different opinions regarding the nature of dark matter and its contribution to the total mass of the matter in the Universe due to a cosmological constant. In the first part some particles candidates for dark matter like neutralino and axions will be discussed and their prediction made by supersymmetry theory. In the second part will be presented different alternative models that imply singularities of the gravitational theory; inflationary models; and in particular one model that introduces a new expression in the gravitational potential as an attempt to explain the phenomena that made us believe in the existence of this kind of matter.
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