General relativity predicts a
singularity in the beginning of the universe being called big bang. Recent
developments in loop quantum cosmology avoid the singularity and the big bang
is replaced by a big bounce. A classical theory of gravitation in flat
space-time also avoids the singularity under natural conditions on the density
parameters. The universe contracts to a positive minimum and then it expands
during all times. It is not symmetric with regard to its minimum implying a
finite age measured with proper time of the universe. The space of the universe
is flat and the total energy is conserved. Under the assumption that the sum of
the density parameters is a little bit bigger than one the universe is very hot
in early times. Later on, the cosmological model agrees with the one of general
relativity. A new interpretation of a non-expanding universe may be given by
virtue of flat space-time theory of gravitation.
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