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2014

Aspects of the cosmological "coincidence problem"

Velten, H. E. S., Marttens, R. F. vom, Zimdahl, W.

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The observational fact that the present values of the densities of dark energy and dark matter are of the same order of magnitude, $\rho_{de0}/\rho_{dm0} \sim \mathcal{O}(1)$, 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 $\rho_{de} = \rho_{dm}$ took place "recently" at a redshift $z \approx 0.55$.

Aspects of the cosmological "coincidence problem" · Around

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