  In a recent work, Boyle, Finn and Turok hypothesized a model of universe that
does not violate the CPT-symmetry as alternative for inflation. With this
approach they described the birth of the Universe from a pair of universes, one
the CPT image of the other, living in pre- and post-big bang epochs. The
CPT-invariance strictly constrains the vacuum states of the quantized fields,
with notable consequences on the cosmological scenarios. Here we examine the
validity of this proposal by adopting the point of view of archaic cosmology,
based on de Sitter projective relativity, with an event-based reading of
quantum mechanics, which is a consequence of the relationship between the
universal information reservoir of the archaic universe and its
out-of-equilibrium state through quantum jumps. In this scenario, the big bang
is caused by the instability of the original (pre)vacuum with respect to the
nucleation of micro-events that represent the actual creation of particles.
Finally, we compare our results with those by Turok et al., including the
analytic continuation across the big bang investigated by Volovik and show that
many aspects of these cosmological scenarios find a clear physical
interpretation by using our approach. Moreover, in the archaic universe
framework we do not have to assume a priori the CPT-invariance like in the
other models of universe, it is instead a necessary consequence of the archaic
vacuum structure and the nucleation process, divided into two specular
universes.
