Abstract:
In this thesis we considered the flat CDM cosmological model to constrain the density parameters,
the Hubble constant and the age of the universe. We did also estimate the mass of the universe
setting some relevant boundary conditions. The analytical derivations were exploited by GR
field equations with the expanding coordinates where the cosmic equations were handled with the
Friedman-Lemaître equations. Mathematica 11.3 was used to generate numerical data to compare
with the observational data of WMAP. To our conclusion, the flat CDM well fits to the observations
in the selected constraints. On the other hand, our derived analytical mass well agrees with
the result obtained through cosmic dimensional analysis. However, our estimated numerical value
is one order higher than obtained earlier which is m 1054kg
