The Milne model was a special relativistic cosmological model proposed by Edward Arthur Milne in 1935. It is mathematically equivalent to a special case of the FLRW model in the limit of zero energy density (in other words, an empty universe), and it obeys the cosmological principle. The Milne model is also similar to Rindler space, a simple re-parameterization of flat Minkowski Space.
Since it features both zero energy density and maximally negative spatial curvature, the Milne model is contradicted by cosmological observations. Astronomers actually observe the universe's density parameter to be consistent with unity and its curvature to be consistent with flatness.
Read more about Milne Model: Milne Metric, Incompatibility With Observation, Milne's Density Function, Differences Between Milne Model and Other Models
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