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APS » Phys. Rev. D » Volume 74 » Issue 12

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Phys. Rev. D 74, 123510 (2006) [8 pages]

Why the Universe started from a low entropy state

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R. Holman
Department of Physics, Carnegie Mellon University, Pittsburgh Pennsylvania 15213, USA

L. Mersini-Houghton
Department of Physics and Astrononmy, UNC-Chapel Hill, North Carolina, 27599-3255, USA

Received 13 September 2006; published 13 December 2006

Weshow that the inclusion of backreaction of massive long wavelengthsimposes dynamical constraints on the allowed phase space of initialconditions for inflation, which results in a superselection rule forthe initial conditions. Only high energy inflation is stable againstcollapse due to the gravitational instability of massive perturbations. Wepresent arguments to the effect that the initial conditions problemcannot be meaningfully addressed by thermostatistics as far as thegravitational degrees of freedom are concerned. Rather, the choice ofthe initial conditions for the universe in the phase spaceand the emergence of an arrow of time have tobe treated as a dynamic selection.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevD.74.123510
DOI:	10.1103/PhysRevD.74.123510
PACS:	98.80.Qc; 11.25.Wx 98.80.Qc Quantum cosmology 11.25.Wx String and brane phenomenology YEAR: 2006
KEYWORDS:	cosmology, cosmic acceleration, entropy, gravitation

REFERENCES (31)

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