The article below and the article it discusses, capture well what I view to be the most likely explanation for the matter-antimatter asymmetry of the universe.
It is attractive, in part, because it reduces the theoretical impulse to try to find baryon number and lepton number violating processes for which there is zero experimental support and there are strong experimental constraints. Most BSM (beyond the Standard Model) theories and GUTs (grand unified theories) hypothesize such process to explain matter-antimatter asymmetry, and all of them are a huge waste of time and dead ends, a priori, and not worth wasting time considering, if an explanation that does not violate the Standard Model exists.
CPT Symmetry in Projective de Sitter Universes
(Submitted on 18 Feb 2020)
In a recent work, Turok, Boyle and Finn 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.
Related prior posts:
* There Is No Experimental Or Observational Evidence To Support A Zero Aggregate Baryon Number At T=0 (June 10, 2019).
* The Anti-Universe (January 28, 2019) (discussing the paper referred to in the abstract).