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Aspects of the cosmological “coincidence problem”
Open accessAbstract
The observational fact that the present values of the densities of dark energy and dark matter are of the same order of magnitude, $$\rho _{\mathrm{de}0}/\rho _{\mathrm{dm}0} \sim \mathcal {O}(1)$$ , seems to indicate that we are currently living in a very special period of the cosmic history. Within the standard model, a density ratio of the order of one just at the present epoch can be seen as coincidental since it requires very special initial conditions in the early Universe. The corresponding “why now” question constitutes the cosmological “coincidence problem”. According to the standard model the equality $$\rho _{\mathrm{de}} = \rho _{\mathrm{dm}}$$ took place “recently” at a redshift $$z \approx 0.55$$ . The meaning of “recently” is, however, parameter dependent. In terms of the cosmic time the situation looks different. We discuss several aspects of the “coincidence problem”, also in its relation to the cosmological constant problem, to issues of structure formation and to cosmic age considerations.
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Under an iron sky: On the entropy at the start of the Universe
Barnes, L. A., & Lewis, G. F. (2021) · Publications of the Astronomical Society of Australia · doi:10.1017/pasa.2021.54 · Cited by 2
“Dark energy was present, lurking in the background at a level that would be irrelevant for several billion years [39].”
Background
Metadata
- Authors
- Velten, H. E. S., vom Marttens, R. F., & Zimdahl, W.
- Affiliations
- Universidade Federal do Espírito Santo (BR)
- Corresponding author
- Velten, H. E. S.
- Venue
- The European Physical Journal C
- Published
- 2014-11
- Volume
- 74
- Issue
- 11
- ISSN
- 1434-6044 (ISSN-L)
- 1434-6052
- OpenAlex
- W2052234880
- Cited by
- 338
- References
- 1
- Citations by year
- 2026: 46 · 2025: 52 · 2024: 66 · 2023: 32 · 2022: 35 · 2021: 32 · 2020: 33 · 2019: 13 · 2018: 13 · 2017: 10 · 2016: 4 · 2015: 2
- FWCI
- 2.87
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Locations
- The European Physical Journal C (publishedVersion, cc-by)
- arXiv (Cornell University) (submittedVersion)
- Springer Link (Chiba Institute of Technology) (submittedVersion)
- arXiv (Cornell University)
- Funders
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Fundação de Amparo à Pesquisa e Inovação do Espírito Santo
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Dark Matter and Cosmic Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Keywords
- coincidence problem, dark energy, dark matter, cosmological constant problem, structure formation, cosmic age
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