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The effective theory of adiabatic fluctuations around arbitrary Friedmann-Robertson-Walker backgrounds - both expanding and contracting - allows for more than one way to obtain scale-invariant two-point correlations.
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J. Khoury and G. Miller, “Towards a Cosmological Dual to Inflation,” arXiv:1012.0846 [hep-th]
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R. Arnowitt, S. Deser and C. Misner, “The Dynamics of General Relativity,” arXiv:gr-qc/0405109
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