Cosmogonic speculations: particle creation from energy conservation in the universe evolution.
Information about the Universe from Hubble's law is consistent with that coming from the evaluation of inertial forces, supporting the picture of a steady-state expansion of a black hole Universe. Backed up also by the consideration of the black body self-energy, the post big bang temperature decrease is consistent with particle creation if energy conservation applies at every scale. This process is shown to provide a gravitational repulsive force which can counterbalance gravitational attraction thus allowing the possibility of a steady non-inflationary expansion. That seems to provide an alternative coherent scheme for our picture of the Universe evolution, disposing of the cosmological term, of dark energy and of the bulk of dark matter.