  Recent observations of the luminosity-redshift in Type Ia supernovae suggest
an accelerated inflation of the Universe (open Universe) as well as the
observed matter density showed to be less than the critical one, suggesting
that a large fraction of the energy density of the Universe is in the form of
dark energy with negative pressure (to supply repulsive forces). We present
here an alternative mechanism on the basis of the photon energy loss in the
inter-galactic gravitational field, and it is close to the Shapiro effect. It
is argue that the redshift observed in distant galaxies is a cumulativeprocess,
a dominant redshift due to the Doppler effect plus a redshift due to photon
energy loss in the intergalactic gravitational field. We show that the last
mechanism when interpreted as Doppler effect, supplies a non lineal
relationship among the speed of recession of the galaxies and their distances.
The effect is very tiny, even so, it increases with the distance and can be the
key to explain the anomalous redshift observed in distant supernovae without
the accelerated inflation hypothesis
