CPT-Symmetric Universe
Latham Boyle, Kieran Finn, Neil Turok

TL;DR
This paper proposes a CPT-symmetric universe model where the universe before and after the big bang are CPT images, offering new insights into baryon asymmetry and dark matter with testable predictions.
Contribution
It introduces a CPT-symmetric cosmological model that explains dark matter and baryon asymmetry using standard particle physics, with specific predictions for neutrino properties and gravitational waves.
Findings
Dark matter abundance matches a 4.8×10^8 GeV neutrino mass
Neutrinos are Majorana particles allowing neutrinoless double beta decay
No primordial long-wavelength gravitational waves
Abstract
We propose that the state of the universe does {\it 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 post-bang epochs comprise a universe/anti-universe 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 remarkably economical explanation for the cosmological dark matter. Requiring only the standard three-generation model of particle physics (with right-handed neutrinos), a symmetry suffices to render one of the right-handed neutrinos stable. We calculate its abundance from first principles: matching the observed dark matter density requires its mass to be $4.8\times10^{8}~{\rm…
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