  In cosmology the number of scientists using the framework of an expanding
universe is very high. This model, the big-bang, is now overwhelmingly present
in almost all aspects of society. It is the main stream cosmology of today. A
small number of scientists are researching on the possibility of a
non-expanding universe. The existence of these two groups, one very large and
the other very small, is a good proof of the use of the scientific method: it
does not drive to an absolute certainty. All models have to be permanently
validated, falsified. Ockham's razor, a powerful philosophical tool, will
probably change the amount of scientists working in each of these groups. We
present here a model where a big-bang is unnecessary. It ends, in a finite
time, in a second INFLATION, or a disaggregation to infinity. We also discuss
the possibilities of a non-expanding universe model. Only a few references will
be cited, mainly concerned with our own work in the past, thus purposely
avoiding citing the many thousands of professionals working in this field.
