Did the universe have a beginning?

Details Did the universe have a beginning? Did the universe have a beginning?

2012-04-20

arxiv.org/abs/1204.4658v1

Physics

High Energy Physics

High Energy Physics - Theory

6 pages, 2 figures. To appear in the Proceedings of the 10th Incternational Conference on Gravitation, Astrophysics and Cosmol

Scientific paper

We discuss three candidate scenarios which seem to allow the possibility that the universe could have existed forever with no initial singularity: eternal infation, cyclic evolution, and the emergent universe. The first two of these scenarios are geodesically incomplete to the past, and thus cannot describe a universe without a beginning. The third, although it is stable with respect to classical perturbations, can collapse quantum mechanically, and therefore cannot have an eternal past.

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