CPT symmetry in cosmology and the Archaic Universe

Abstract

In a recent paper Boyle, Finn and Turok hypothesized that the Universe does not violate the CPT-symmetry. Thus, a pair of universes is obtained, one prior to the other following the big bang, while the request for CPT-invariance strictly constrains the vacuum states of quantized fields, with notable consequences on cosmological scenarios. Here we re-examine this proposal from the point of view of archaic cosmology, based on de Sitter projective relativity and an event-based reading of quantum mechanics. In this scenario the big bang is caused by the instability of the original (pre)vacuum with respect to the nucleation of micro-events (creation of particles). We highlight how this nucleation is divided into two specular universes and CPT-symmetry is a natural aspect of it. Finally, we compare our results with Boyle et al and with the analytic continuations across the big bang investigated by Volovik, highlighting the convergences and differences with these approaches.