The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang

Details The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang

2001-03-29

arxiv.org/abs/hep-th/0103239v3

Phys.Rev.D64:123522,2001

Physics

High Energy Physics

High Energy Physics - Theory

67 pages, 4 figures. v2,v3: minor corrections, references added

Scientific paper

10.1103/PhysRevD.64.123522

We propose a cosmological scenario in which the hot big bang universe is produced by the collision of a brane in the bulk space with a bounding orbifold plane, beginning from an otherwise cold, vacuous, static universe. The model addresses the cosmological horizon, flatness and monopole problems and generates a nearly scale-invariant spectrum of density perturbations without invoking superluminal expansion (inflation). The scenario relies, instead, on physical phenomena that arise naturally in theories based on extra dimensions and branes. As an example, we present our scenario predominantly within the context of heterotic M-theory. A prediction that distinguishes this scenario from standard inflationary cosmology is a strongly blue gravitational wave spectrum, which has consequences for microwave background polarization experiments and gravitational wave detectors.

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