کیهانشناسی ِ استانده keyhânšenâsi-ye estândé
*Fr.: cosmologie standard*
The conventional → *Big Bang* model, which is based on two
assumptions: the → *cosmological principle* of homogeneity
and isotropy leading to the → *Robertson-Walker metric*, and
→ *Einstein's field equation*s
of general relativity along with familiar properties of matter.
This model is a remarkably successful operating hypothesis describing the
evolution of the Universe from 1/100 second after the initial event through to the present day.
It provides explanations for several basic problems
such as: → *Hubble's law* of recession of galaxies,
interpreted in terms of the expansion of the Universe; the abundances of the
→ *light element*s, in excellent agreement with the predictions of
→ *primordial nucleosynthesis*; and the thermal spectrum and angular
isotropy of the → *cosmic microwave background (CMB) radiation*,
as expected from a hot, dense early phase of expansion. For a non-standard
model, see → *ekpyrotic Universe*. → *standard*; → *cosmology*. |