** Authors:**
MURAT ÖZER

** Abstract: **
We have reanalyzed the age of the universe problem under the assumption
that the lower limit on the age of the globular clusters is \sim11 Gyr, as
predicted by the recent Hipparcos data. We find that the globular
cluster and the expansion ages in a standard \lambda=0 universe are
consistent only if the present value H_0 of the Hubble constant is
\leq 60{\rm kms}^{-1}Mpc^{-1}. If H_0>60{\rm kms}^{-1}Mpc^{-1} some kind of
modification of the standard \lambda=0 model is required. Invoking a
(time-independent) cosmological term \lambda in the Einstein field
equations, as has been done frequently before, we have found that due to
the gravitational lensing restrictions a flat universe with the present
matter density parameter \Omega_M<0.5 is not problem-free. A nonflat
universe with \Omega_M\leq 1 does not suffer from the age problem if
H_0\leq 75{\rm kms}^{-1}Mpc^{-1}.

** Keywords: **

** Full Text:** PDF