# 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
}
}
• Published 23 March 2018
• Physics
• Physical review letters
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…

### 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

• Physics
Physica 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

• Physics
Physical 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

• Physics
Universe
• 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

• Physics
Symmetry
• 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

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

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

## References

SHOWING 1-10 OF 39 REFERENCES

### Sterile neutrinos as dark matter.

• Physics
Physical review letters
• 1994
This model is reexamine and it is found that hot, warm, and cold dark matter are all possibilities and the number density of sterile neutrinos is proportional to [mu][sup 2]/M so that the energy density today is independent of M, which is crucial in determining the large scale structure of the Universe.

### Dark Matter, Baryogenesis and Neutrino Oscillations from Right Handed Neutrinos

• Physics
• 2013
We show that, leaving aside accelerated cosmic expansion, all experimental data in high energy physics that are commonly agreed to require physics beyond the Standard Model can be explained when

### Leptogenesis as the origin of matter

• Physics
• 2005
▪ Abstract We explore in some detail the hypothesis that the generation of a primordial lepton-antilepton asymmetry (Leptogenesis) early on in the history of the Universe is the root cause for the

### New Dark Matter Candidate: Nonthermal Sterile Neutrinos

• Physics
• 1999
We propose a new and unique dark matter candidate: $\ensuremath{\sim}100$ eV to $\ensuremath{\sim}10$ keV sterile neutrinos produced via lepton-number-driven resonant Mikheyev-Smirnov-Wolfenstein

### The Role of Sterile Neutrinos in Cosmology and Astrophysics

• Physics
• 2009
We present a comprehensive overview of an extension of the Standard Model that contains three right-handed (sterile) neutrinos with masses below the electroweak scale [the Neutrino Minimal Standard

### Upgoing ANITA events as evidence of the CPT symmetric universe

• Physics
• 2018
We explain the two upgoing ultra-high energy shower events observed by ANITA as arising from the decay in the Earth's interior of the quasi-stable dark matter candidate in the CPT symmetric universe.

### Quantum propagation across cosmological singularities

• Physics
• 2017
The initial singularity is the most troubling feature of the standard cosmology, which quantum effects are hoped to resolve. In this paper, we study quantum cosmology with conformal (Weyl) invariant

### Stability of the Electroweak Vacuum: Gauge Independence and Advanced Precision.

• Physics
Physical review letters
• 2015
An upper bound on the pole mass of the top quark is derived by requiring that the standard model be stable all the way up to the Planck mass scale and conservatively estimate the theoretical uncertainty.

### Inflation without a beginning: A Null boundary proposal

• Physics
• 2003
We develop our recent suggestion that inflation may be made past eternal, so that there is no initial cosmological singularity or "beginning of time". Inflation with multiple vacua generically

### The Search for neutrinoless double beta decay

• Physics
• 2011
In the last two decades the search for neutrinoless double beta decay has evolved into one of the highest priorities for understanding neutrinos and the origin of mass. The main reason for this