[1203.4479] Local and non-local measures of acceleration in cosmology - 0 views
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Phil Bull on 12 Apr 12As soon as you move away from a perfectly homogeneous and isotropic cosmological model, what is meant by the "acceleration" of spacetime becomes ambiguous. It's important to be clear on what type of acceleration is being considered in any given observational or theoretical study, since different types can have very different cosmological implications.