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Justin Khoury Princeton A recently proposed new cosmological scenario will be discussed. In this model, the hot big bang universe emerges from the collision of a brane moving in an extra dimension with an end-of-the-world brane, beginning from an otherwise cold, vacuous, static state. The model resolves the horizon, flatness and monopole problems, and generates a scale-invariant spectrum of density fluctuations without a period of superluminal expansion (inflation). The Ekpyrotic scenario can be distinguished experimentally from inflation in that it predicts a strongly blue spectrum of gravitational waves.
Friday, May 18th 2001, 13:00 |