REVIEW 5 cited by
The Big Bang, CPT, and neutrino dark matter
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
abstract
We investigate the idea that the universe before the Big Bang is the $CPT$ reflection of the universe after the bang, both classically and quantum mechanically, so that the universe does {\it not} spontaneously violate $CPT$. We show how $CPT$ symmetry selects a preferred vacuum state for quantum fields on a $CPT$-invariant cosmological background spacetime. The universe before the bang and the universe after the bang may be viewed as a universe/anti-universe pair, emerging directly into the hot, radiation-dominated era we observe in our past. This, in turn, leads to a remarkably economical explanation of the cosmological dark matter. With no additional fields beyond Einstein gravity and the standard model of particle physics (including right-handed neutrinos), a $\mathbb{Z}_{2}$ symmetry stabilizes one of the right-handed neutrinos. We calculate its abundance in detail and show that, in order to match the observed dark matter density, its mass must be $4.8\times10^{8}~{\rm GeV}$. We obtain several further predictions, including: (i) that the three light neutrinos are majorana; (ii) that one of these is exactly massless; and (iii) that, in the absence of an epoch of cosmic inflation, there should be no primordial, long-wavelength gravitational waves. We also briefly discuss the natural origin of the matter-antimatter asymmetry within this picture and possibilities for explaining the cosmological perturbations.
Forward citations
Cited by 5 Pith papers
-
Repulsive dark matter from Hosotani mechanism
Two Scherk-Schwarz-twisted fermions in a 5D gauge theory make the fifth-component dark matter scalar self-repel, yielding viable ultralight dark matter with mass 10⁻²¹–1 eV and astrophysical-size solitons.
-
Conformally-flat gravitational analogues to the Schwinger effect
Resummed heat kernels yield exact scalar pair-creation probabilities in conformally flat spacetimes, including new curvature-induced Schwinger analogues, with the radiation-dominated rate verified independently in arb...
-
Fermion (non)reheating with a quartic inflaton potential
In the quartic T-model, inflaton decay to fermions is strongly suppressed by Pauli blocking and parametric resonance, so fermion-only reheating is effectively impossible unless y ≳ 0.2 or a scalar channel is added.
-
Fixed points of classical gravity coupled with a Standard-Model-like theory
A free conformal matter content with n1/2=4n1 and n'_0=3n1 gives a UV fixed point where all stress tensor correlators are finite; the Standard Model with right-handed neutrinos and 36 four-derivative scalars is such a theory.
-
A proposal for the role of higher spin fields in Conformal Cyclic Cosmology
A qualitative proposal that non-unitary higher spin physics inside black holes removes degrees of freedom from phase space, resetting entropy between aeons of Conformal Cyclic Cosmology.
Discussion (0). Sign in to comment.