Cosmic coincidence
This article will address the topic of Cosmic coincidence, which is of great relevance today. Cosmic coincidence has captured the attention of a wide spectrum of audiences, from experts in the field to people interested in acquiring knowledge about this topic. Throughout this reading, various perspectives and approaches related to Cosmic coincidence will be explored, with the aim of providing a complete and enriching overview. From its historical origin to its contemporary implications, this article seeks to offer a comprehensive view of Cosmic coincidence and its impact in different contexts. In addition, possible future trends will be analyzed and reflections on its development and evolution will be presented.
In cosmology, the cosmic coincidence is the observation that at the present epoch of the universe's evolution, the energy densities associated with dark matter and dark energy are of the same order of magnitude, leading to their comparable effects on the dynamics of the cosmos.[1] This coincidence is puzzling because these energies have vastly different effects on the universe's expansion—dark matter tends to slow down expansion through gravitational attraction, while dark energy seems to accelerate it. The observed similarity in the magnitudes of these two components' energy densities at this particular epoch in the universe's history raises questions about whether there might be some underlying physical connection or shared origin between dark matter and dark energy. Indeed, some theories attempt to explain this coincidence by proposing that they are different manifestations of the same fundamental force or field.[2][3][4]
References
- ^ Steinhardt, P. J. (1997). Critical Problems in Physics. Princeton, NJ: Princeton University Press.
- ^ Barreiro, T.; Copeland, E. J.; Nunes, N. J. (2000). "Quintessence arising from exponential potentials". Physical Review D. 61 (12) 127301. arXiv:astro-ph/9910214. Bibcode:2000PhRvD..61l7301B. doi:10.1103/PhysRevD.61.127301.
- ^ Deur, Alexandre (2009). "Implications of Graviton-Graviton Interaction to Dark Matter". Physics Letters B. 676 (1–3): 21–24. arXiv:0901.4005. Bibcode:2009PhLB..676...21D. doi:10.1016/j.physletb.2009.04.060.
- ^ De Felice, Antonio; Tsujikawa, Shinji (2010). "f(R) theories". Living Reviews in Relativity. 13 (1): 3. arXiv:1002.4928. Bibcode:2010LRR....13....3D. doi:10.12942/lrr-2010-3. PMC 5255939. PMID 28179828.