Phys. Rev. Lett. 84, 2072–2075 (2000)Generalized Second Law in Cosmology from Causal Boundary EntropyReceived 17 May 1999; revised 5 October 1999; published in the issue dated 6 March 2000 A classical and quantum mechanical generalized second law of thermodynamics in cosmology implies constraints on the effective equation of state of the universe in the form of energy conditions, obeyed by many known cosmological solutions, forbids certain cosmological singularities, and is compatible with entropy bounds. This second law is based on the conjecture that causal boundaries and not only event horizons have geometric entropies proportional to their area. In string cosmology the second law provides new information about nonsingular solutions. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.2072
DOI:
10.1103/PhysRevLett.84.2072
PACS:
98.80.Hw, 04.20.Dw, 04.70.Dy
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