On Backreaction in Newtonian cosmology

Abstract

We clarify that a result recently stated by Kaiser is contained in a theorem of Buchert and Ehlers that is widely known for its main result: that there is no global kinematical backreaction in Newtonian cosmology. Kaiser cites this paper, re-derives parts of the theorem, but incompletely restates its content. He makes further claims, which cannot be proven beyond the limited context of Newtonian cosmology. We also discuss recent papers of Rácz et al. and Roukema who claim the existence of global backreaction within the Newtonian framework.

4 pages; refers to V1 and V2 of arXiv:1703.08809; matches published version in MNRAS Letters

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• The Fractal Geometry of the Cosmic Web and its Formation
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• A common explanation of the Hubble tension and anomalous cold spots in the CMB
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• Surface Tension of Cosmic Voids as a Possible Source for Dark Energy
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