I'm not quit sure whether we had this paper here already, since it is a couple of weeks old. I've seen it here(adsbygoogle = window.adsbygoogle || []).push({});

https://phys.org/news/2017-12-dark-energy-mathematicians-alternative-explanation.html

and I'm somehow fascinated by the idea to get rid of dark energy as only explanation of current observations. Unfortunately the full text doesn't seem to be freely available, but here's the abstract and some of our members might have access to the journal. Also the long review process is a bit surprising (to me).

http://rspa.royalsocietypublishing.org/content/473/2207/20160887

Is there hope that there's something to it, or is it just another unrealistic solution of EFE?Abstract

We identify the condition for smoothness at the centre of spherically symmetric solutions of Einstein’s original equations without the cosmological constant or dark energy. We use this to derive a universal phase portrait which describes general, smooth, spherically symmetric solutions near the centre of symmetry when the pressurep=0. In this phase portrait, the criticalk=0 Friedmann space–time appears as a saddle rest point which is unstable to spherical perturbations. This raises the question as to whether the Friedmann space–time is observable by redshift versus luminosity measurements looking outwards from any point. The unstable manifold of the saddle rest point corresponding to Friedmann describes the evolution of local uniformly expanding space–times whose accelerations closely mimic the effects of dark energy. A unique simple wave perturbation from the radiation epoch is shown to trigger the instability, match the accelerations of dark energy up to second order and distinguish the theory from dark energy at third order. In this sense, anomalous accelerations are not only consistent with Einstein’s original theory of general relativity, but are a prediction of it without the cosmological constant or dark energy.

- Received December 5, 2016.
- Accepted October 24, 2017.

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# I Expansion without dark energy

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