Spiros Cotsakis, Georgios Kolionis, Antonios Tsokaros
We study limits of vacuum, isotropic universes in the full, effective, four-dimensional theory with higher derivatives. We show that all flat vacua as well as general curved ones are globally attracted by the standard, square root scaling solution at early times. Open vacua asymptote to horizon-free, Milne states in both directions while closed universes exhibit more complex logarithmic singularities, starting from initial data sets of a smaller dimension.
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http://arxiv.org/abs/1303.2234
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