CPT-Symmetric Universe.

@article{Boyle2018CPTSymmetricU,
  title={CPT-Symmetric Universe.},
  author={Latham A. Boyle and Kieran Finn and Neil Turok},
  journal={Physical review letters},
  year={2018},
  volume={121 25},
  pages={
          251301
        }
}
We propose that the state of the Universe does not spontaneously violate CPT. Instead, the Universe after the big bang is the CPT image of the Universe before it, both classically and quantum mechanically. The pre- and postbang epochs comprise a universe-antiuniverse pair, emerging from nothing directly into a hot, radiation-dominated era. CPT symmetry selects a unique QFT vacuum state on such a spacetime, providing a new interpretation of the cosmological baryon asymmetry, as well as a… 

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