Nature and Origin of Dark Matter and Dark Energy II

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: 31 March 2025 | Viewed by 342

Special Issue Editors


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Guest Editor
1. Ronin Institute for Independent Scholarship, 127 Haddon Pl., Montclair, NJ 07043, USA
2. Institute for Advanced Physical Studies, Boulevard “Tsarigradsko Shose” 111, Sofia 1784, Bulgaria
Interests: nuclear and particle physics; theoretical and mathematical physics; gravity and general relativity; cosmology and astrophysics
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
1. Insitute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, UK
2. Institute of Space Sciences (ICE, CSIC), 08193 Barcelona, Spain
3. Institut d Estudis Espacials de Catalunya (IEEC), 08034 Barcelona, Spain
Interests: cosmology; dark cosmos; large scale structure of the universe

Special Issue Information

Dear Colleagues,

Dark matter (DM) and dark energy (DE) are the two most challenging problems in contemporary physics and astrophysics. DM and DE constitute about 95% of the Universe's energy content, but their nature remains unknown. Supporting evidence for DM has been obtained from astronomical observations of the rotation curve of galaxies, the growth of the density fluctuations in the Universe, gravitational lenses, Cosmic Microwave Background (CMB) fluctuations, etc. DE evidence originates from the observed acceleration of the expansion of the Universe. For over three decades, studies in large particle physics labs like CERN have failed to identify the nature of DM and DE. On the theoretical side, physicists have explored two main avenues: the existence of unknown particles and modifications to fundamental symmetry properties in gravitational theory and cosmology.

This Special Issue of Symmetry is devoted to presenting both new results on the observational constraints of dark matter and dark energy and new theoretical interpretations regarding their nature and origin.

Dr. Vesselin Gueorguiev
Prof. Dr. Enrique Gaztanaga
Guest Editors

Manuscript Submission Information

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Keywords

  • dark matter
  • dark energy
  • cosmology
  • galaxies
  • CMB
  • universe
  • expansion
  • cosmological constant

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Published Papers (1 paper)

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Review

27 pages, 2290 KiB  
Review
The Scale-Invariant Vacuum Paradigm: Main Results and Current Progress Review (Part II)
by Vesselin G. Gueorguiev and Andre Maeder
Symmetry 2024, 16(6), 657; https://doi.org/10.3390/sym16060657 - 26 May 2024
Viewed by 196
Abstract
This is a summary of the main results within the Scale-Invariant Vacuum (SIV) paradigm based on Weyl integrable geometry. We also review the mathematical framework and utilize alternative derivations of the key equations based on the reparametrization invariance as well. The main results [...] Read more.
This is a summary of the main results within the Scale-Invariant Vacuum (SIV) paradigm based on Weyl integrable geometry. We also review the mathematical framework and utilize alternative derivations of the key equations based on the reparametrization invariance as well. The main results discussed are related to the early universe; that is, applications to inflation, Big Bang Nucleosynthesis, and the growth of the density fluctuations within the SIV. Some of the key SIV results for the early universe are a natural exit from inflation within the SIV in a later time texit with value related to the parameters of the inflationary potential along with the possibility for the density fluctuations to grow sufficiently fast within the SIV without the need for dark matter to seed the growth of structure in the universe. In the late-time universe, the applications of the SIV paradigm are related to scale-invariant dynamics of galaxies, MOND, dark matter, and dwarf spheroidals, where one can find MOND to be a peculiar case of the SIV theory. Finally, within the recent time epoch, we highlight that some of the change in the length-of-the-day (LOD), about 0.92 cm/yr, can be accounted for by SIV effects in the Earth–Moon system. Full article
(This article belongs to the Special Issue Nature and Origin of Dark Matter and Dark Energy II)
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