# 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…

## 82 Citations

### CPT Symmetry in Projective de Sitter Universes

- Physics
- 2020

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…

### CPT symmetry in cosmology and the Archaic Universe

- PhysicsPhysica Scripta
- 2020

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…

### Sterile neutrino dark matter from generalized CPT -symmetric early-Universe cosmologies

- PhysicsPhysical Review D
- 2021

We generalize gravitational particle production in a radiation-dominated CPT -symmetric universe to non-standard, but also CPT -symmetric early universe cosmologies. We calculate the mass of a…

### Axion–Sterile Neutrino Dark Matter

- PhysicsUniverse
- 2021

Extending the standard model with three right-handed neutrinos and a simple QCD axion sector can account for neutrino oscillations, dark matter and baryon asymmetry; at the same time, it solves the…

### Two-Sheeted Universe, Analyticity and the Arrow of Time

- Physics
- 2021

Our universe seems to be radiation dominated at early times, and vacuum energy dominated at late times. When we consider the maximal analytic extension of this spacetime, its symmetries and complex…

### CPT Symmetry in Two-Fold de Sitter Universe

- PhysicsSymmetry
- 2021

This work shows CPT symmetry derives from the nucleation of particles that divides the hypersphere in two mirror universes and defines big bang as a bifurcation point, as the creation of a de Sitter universe or a pair of entangled universes from “nothing”.

### Comment to the CPT-symmetic Universe: Two possible extensions

- PhysicsJETP Letters
- 2019

In Ref.1 (L. Boyle, K. Finn and N. Turok, CPT-Symmetric Universe, Phys. Rev. Lett. {\bf 121}, 251301 (2018)) the antispacetime Universe was suggested as the analytic continuation of our Universe…

### Cancelling the vacuum energy and Weyl anomaly in the standard model with dimension-zero scalar fields

- Physics
- 2021

The standard model is a remarkably consistent and complete quantum ﬁeld theory but its coupling to gravity and the Higgs ﬁeld remain problematic, as reﬂected in the cosmological constant problem, the…

### Cosmology in a Globally U(1) Symmetric Scalar-Tensor Gravity

- Physics
- 2019

A cosmological model is formulated in the context of a scalar-tensor theory of gravity in which the entire cosmic background evolution is due to a complex scalar field evolving in Minkowski…

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