Comment on "Hubble flow variations as a test for inhomogeneous cosmology"
2019
Saulder et al [arXiv:1811.11976] have performed a novel observational test of
the local expansion of the Universe for the standard cosmology as compared to
an alternative model with differential cosmic expansion. Their analysis employs
mock galaxy samples from the Millennium Simulation, a Newtonian $N$-body
simulation on a ΛCDM background. For the differential expansion case
the simulation has been deformed in an attempt to incorporate features of a
particular inhomogeneous cosmology: the timescape model. It is shown that key
geometrical features of the timescape cosmology have been omitted in this
rescaling. Consequently, the differential expansion model tested by Saulder et
al [arXiv:1811.11976] cannot be considered to approximate the timescape
cosmology.
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