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Is the acceleration of the expansion of the universe (AEU) uniform in direction? Meaning that if a particular direction in the sky is chosen and the AEU is measured and then other directions are chosen and the AEU are measured, do all these measurements agree?

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  • $\begingroup$ AFAIK, the measurements by Riess et al were originally taken in all directions. $\endgroup$ – Kyle Kanos Mar 2 '14 at 20:53
  • $\begingroup$ I am fairly sure that all of our experimental evidence is consistent with an isotropic Universe. $\endgroup$ – Danu Mar 2 '14 at 21:11
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I don't think we know for sure. For example see this article (the paper is on the Arxiv here) suggesting that the acceleration could be anisotropic. However if there is an anisotropy then it's small, and to a first approximation yes the acceleration is isotropic.

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  • $\begingroup$ Note that if this is true, then the cause of the acceleration is NOT dark energy, or at least not a simple dark energy like a cosmological constant. $\endgroup$ – Jerry Schirmer Apr 2 '14 at 17:20

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