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The FRW is a nice isotropic and symmetric metric but I think its assumptions are too many. I was wondering about alternative models. Specifically are there any prominent alternatives that have more fleshed out local detail? For example, are there any models that can ascribe a more local interpretation to data which was considered as crucial support for the Big Bang.

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An obvious example is the Hubble bubble though this doesn't invalidate the FLRW model, it just means the homogeneity is on a larger scale than the observable universe. However I get the impression the Hubble bubble idea is not widely considered likely.

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    $\begingroup$ I don't know of any such theories, or at least none taken seriously by the physics community. There's a good reason the FLRW approximation has survived this long :-) I suppose the axis of evil or the CMB North-South asymmetry (arxiv.org/abs/0809.0934) might be candidates. $\endgroup$ Aug 21 '13 at 9:25
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There's also the Mixmaster Universe, studied in the 1980s. I'll give a couple references:

  1. Neil Cornish and Janna Levin, "The mixmaster universe: A chaotic Farey tale". Phys.Rev. D55 (1997) 7489–7510. Eprint arXiv:gr-qc/9612066
  2. Charles Misner's original paper "Mixmaster Universe". Phys. Rev. Lett. 22 (1969) 1071–1074. DOI:10.1103/PhysRevLett.22.1071
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