Cosmological Models of the Universe

A special issue of Universe (ISSN 2218-1997). This special issue belongs to the section "Cosmology".

Deadline for manuscript submissions: 31 July 2024 | Viewed by 1165

Special Issue Editors


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Guest Editor
Department of Mathematics, National and Kapodistrian University of Athens, Athens, Greece
Interests: modified gravity; cosmology; gravitational waves; Finsler cosmology; extended Friedmann equations; dark matter; dark energy
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
1. National Observatory of Athens, Lofos Nymfon, 11852 Athens, Greece
2. CAS Key Laboratory for Researches in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230026, China
3. Departamento de Matemáticas, Universidad Católica del Norte, Avda. Angamos 0610, Casilla, Antofagasta 1280, Chile
Interests: ark energy formulation; modified theories of gravity; inflationary cosmology; brane cosmology; observational cosmology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Cosmological models are described by mathematical formulas that attempt to explain the current behavior and evolution of the universe over time. They are based on observations making predictions that can be effective by resultant investigations and rely on general relativity because that theory describes the best way that the large-scale behavior of spacetime can be observed. Cosmological models extend the form of general relativity through various methods, leading to different field equations and thus to different cosmological implications. They play an essential role and contribute to modern cosmology, providing a foundation for the current understanding of the physical phenomena of the universe. A fundamental category of cosmological models is inflationary models which provide potential solutions to the fundamental problems of standard cosmological models on Big Bang cosmology, i.e., the Flatness and Horizon problem. Additionally, these models sufficiently describe energy density fluctuation mechanisms that investigate the large-scale structure of the universe. The measurement of CMB polarization and its anisotropies has a great significance to early universe physics, and the mechanisms of matter creation generate primordial metric fluctuations that affect the geometry of the universe (e.g., inflationary models). The abovementioned cosmological model provides observational tests which explain the origin of light and the existence of the cosmic microwave background and establishes the fact that the universe has a thermal history. On the other hand, the study of the large-scale structure of the universe and observational evidence demands the existence of dark matter and a nonzero cosmological constant; investigations in this direction introduce a model known as the ΛCDM model. As well, anisotropic cosmological models have been developed when the underline geometry of spacetime has a more generalized metric structure than the Riemannian one. Topics of interest for this Special Issue include, but are not limited to, the following: Standard cosmological models; Inflationary cosmological models; ΛCDM cosmological model; Anisotropic cosmological models; Finsler cosmology.

Prof. Dr. Panayiotis Stavrinos
Prof. Dr. Emmanuel N. Saridakis
Guest Editors

Manuscript Submission Information

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Keywords

  • standard cosmological model
  • dark matter
  • dark energy
  • bounce cosmology
  • inflation cosmology
  • ΛCDM-cosmology
  • anisotropic cosmology

Published Papers (1 paper)

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Research

12 pages, 681 KiB  
Communication
Radial Oscillations of Dark Matter Stars Admixed with Dark Energy
by Camila Sepúlveda and Grigoris Panotopoulos
Universe 2024, 10(1), 41; https://doi.org/10.3390/universe10010041 - 16 Jan 2024
Viewed by 961
Abstract
We imagine spherically symmetric configurations made of both dark matter and dark energy in the halo of spiral galaxies. Adopting a polytropic equation of state for dark matter and the Extended Chaplygin gas equation of state for dark energy, we model the same [...] Read more.
We imagine spherically symmetric configurations made of both dark matter and dark energy in the halo of spiral galaxies. Adopting a polytropic equation of state for dark matter and the Extended Chaplygin gas equation of state for dark energy, we model the same object with three different dark matter–dark energy compositions. We compute the frequencies and the corresponding eigenfunctions of the ten lowest modes, integrating the equations for the radial perturbations by imposing the appropriate boundary conditions at the center and the surface of the object. Also, a comparison between the different models is made. Full article
(This article belongs to the Special Issue Cosmological Models of the Universe)
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