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]
^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. PMID 28179828.
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In cosmology, the cosmiccoincidence is the observation that at the present epoch of the universe's evolution, the energy densities associated with dark...
A coincidence is a remarkable concurrence of events or circumstances that have no apparent causal connection with one another. The perception of remarkable...
foundations of cosmic-ray and particle physics. About the same time, and independently of Rossi, Bothe devised a less practical electronic coincidence device...
The cosmic microwave background (CMB or CMBR) is microwave radiation that fills all space in the observable universe. It is a remnant that provides an...
interaction took place. Anti-coincidence counters or "vetos" are often used to filter common backgrounds, such as cosmic rays, from interacting with the...
Cosmic rays or astroparticles are high-energy particles or clusters of particles (primarily represented by protons or atomic nuclei) that move through...
1144/gsjgs.148.5.0825. S2CID 28548230. Amos, Jonathan (17 October 2012). "Cosmiccoincidence on the road to Glenelg". BBC News. Retrieved 20 October 2012. Williamson...
Rees, M., CosmicCoincidences: Dark Matter, Mankind, and Anthropic Cosmology, pp. 7, 269. 1989, ISBN 0-553-34740-3 Davis, Paul (2007). Cosmic Jackpot:...
the experiment to the coincidence loophole. This led to a reanalysis of the experimental data in a way which removed the coincidence loophole, and fortunately...
a rock called Jake". Cosmic Log on NBC News. Retrieved 19 September 2012. Amos, Jonathan (17 October 2012). "Cosmiccoincidence on the road to Glenelg"...
it opens a sentence: By a tragic coincidence By an exceptional coincidence By a curious coincidence By a coincidence of no importance You and I know,...
which discovered the atomic nucleus. He also carried the Bothe–Geiger coincidence experiment that confirmed the conservation of energy in light-particle...
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Large-scale Time-coincidence Array (WALTA) is a cosmic ray physics experiment run by the University of Washington to investigate ultra high energy cosmic rays (>1019eV)...
accelerators during a supernova during the spin-down of a neutron star when cosmic rays or accelerated particle beams strike atoms The majority of neutrinos...
current member of the House of Lords Science and Technology Committee. CosmicCoincidences: Dark Matter, Mankind, and Anthropic Cosmology (co-author John Gribbin)...
relation. The radial acceleration relation. The Hubble tension. The cosmiccoincidence, that is the fact that at present time, the purported repulsion of...
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