Why the Universe Started from a Low Entropy State

Details Why the Universe Started from a Low Entropy State Why the Universe Started from a Low Entropy State

2005-11-09

arxiv.org/abs/hep-th/0511102v3

Phys.Rev.D74:123510,2006

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, 2 figs. Final version; agrees with accepted version in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.74.123510

We show that the inclusion of backreaction of massive long wavelengths imposes dynamical constraints on the allowed phase space of initial conditions for inflation, which results in a superselection rule for the initial conditions. Only high energy inflation is stable against collapse due to the gravitational instability of massive perturbations. We present arguments to the effect that the initial conditions problem {\it cannot} be meaningfully addressed by thermostatistics as far as the gravitational degrees of freedom are concerned. Rather, the choice of the initial conditions for the universe in the phase space and the emergence of an arrow of time have to be treated as a dynamic selection.

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