Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 18, Issue 4, Pages 601-618Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/18/4/303
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We investigate the evolution of different measures of 'gravitational entropy' in Bianchi type I and Lemaitre-Tolman universe models. A new quantity behaving in accordance with the second law of thermodynamics is introduced. We then go on and investigate whether a quantum calculation of initial conditions for the universe based upon the Wheeler-DeWitt equation supports Penrose's Weyl curvature conjecture, according to which the Ricci part of the curvature dominates over the Weyl part at the initial singularity of the universe. The theory is applied to the Bianchi type I universe models with dust and a cosmological constant and to the Lemaitre-Tolman universe models. We investigate two different versions of the conjecture. First, we investigate a local version which fails to support the conjecture. Thereafter we construct a non-local entity which shows more promising behaviour concerning the conjecture.
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