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Celestial Expansion
Encompasses the big bang and big crunch theories, the theory of dark matter, and other concepts relating to the universe's expansion.
http://www.geocities.com/celestialexpansion/

Quantum Cosmology
A non-technical overview of quantum cosmology
http://www.damtp.cam.ac.uk/user/gr/public/qg_qc.html

Cosmology in a Brane Universe
This lecture presents the cosmological models with extra dimensions that have been recently elaborated, which assume that ordinary matter is confined on a surface, called brane, embedded in a higher dimensional spacetime.
http://arxiv.org/abs/astro-ph/0301022

From Newton's Laws to the Wheeler-deWitt equation
This is a pedagogical paper which explains some ideas in cosmology at a level accessible to undergraduate students. Following standard quantization procedures the Wheeler-DeWitt equation in the minisuperspace approximation is derived for empty and non-empty universes.
http://arxiv.org/abs/physics/9806004