The various observational datasets discussed above constrain the ratio of the dark energy density to
the critical density to be , where
is Hubble’s constant and
is
expressed in
. This value, together with the matter density
(see below), leads to a total
, i.e., a spatially-flat Euclidean geometry in the Robertson–Walker sense
that is nicely consistent with the expectations of inflation. It is important to stress that this
model relies on the cosmological principle, i.e., that our observational location in the Universe is
not special, and on the fact that on large scales, the Universe is isotropic and homogeneous.
For possible challenges to these assumptions and their consequences, we refer the reader to,
e.g., [83, 487, 488].
http://www.livingreviews.org/lrr-2012-10 |
Living Rev. Relativity 15, (2012), 10
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