Can the universe fragment into many independent causal patches at turnaround in cyclic cosmology?
Department of Physics, College of Sciences, Northeastern University, Shenyang, 110004, People’s Republic of China
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Revised: 6 November 2008
Published online: 4 December 2008
Infinitely cyclic cosmology is often frustrated by the second law of thermodynamics which dictates that the entropy increases from cycle to cycle so that extrapolation into the past will lead back to an initial singularity. It has been argued in the literature that the entropy problem can be resolved in a particular cyclic universe model through a deflation mechanism (i.e., the universe fragments into an astronomically large number of disconnected causal patches at the turnaround). We point out that in this cyclic model the Hubble distance will become infinity at the turnaround; thus the deflation scenario does not seem to be valid.
© Springer-Verlag , 2009