In article <
9d1f6a5a-c853-4577...@googlegroups.com>, Jaco=
>=20
> arXiv:1712.07962v2 [physics.gen-ph] 26 Oct 2018
> ABSTRACT
> Dark energy and dark matter constitute 95% of the observable Universe=
.
> Yet the physical nature of these two phenomena remains a mystery.
> Einstein suggested a long-forgotten solution: gravitationally
> repulsive negative masses, which drive cosmic expansion and cannot
> coalesce into light-emitting structures. However, contemporary
> cosmological results are derived upon the reasonable assumption
> that the Universe only contains positive masses. By reconsidering
> this assumption, I have constructed a toy model which suggests that
> both dark phenomena can be unified into a single negative mass
> fluid. The model is a modified Lambda-CDM cosmology, and indicates
> that continuously-created negative masses can resemble the cosmologic=
al
> constant and can flatten the rotation curves of galaxies. The model
> leads to a cyclic universe with a time-variable Hubble parameter,
> potentially providing compatibility with the current tension that
> is emerging in cosmological measurements. In the first three-dimensio=
nal
> N-body simulations of negative mass matter in the scientific
> literature, this exotic material naturally forms haloes around
> galaxies that extend to several galactic radii. These haloes are
> not cuspy. The proposed cosmological model is therefore able to
> predict the observed distribution of dark matter in galaxies from
> first principles. The model makes several testable predictions and
> seems to have the potential to be consistent with observational
> evidence from distant supernovae, the cosmic microwave background,
> and galaxy clusters. These findings may imply that negative masses
> are a real and physical aspect of our Universe, or alternatively
> may imply the existence of a superseding theory that in some limit
> can be modelled by effective negative masses. Both cases lead to the
> surprising conclusion that the compelling puzzle of the dark Universe
> may have been due to a simple sign error.
There was much discussion when that came out a few years ago. Suffice=20
it to say that he has convinced practically no-one and many people have=20
pointed out deficiencies in the idea.
Although arXiv is certainly not always right, in many cases astrophysics=20
papers are in the gen-ph rather than astro-ph category if arXiv thinks=20
that they are not very good. Now arXiv is not always right, and their=20
decisions in such cases are very obscure, but look at what is in gen-ph=20
and compare it to astro-ph and draw your own conclusions.