The Ekpyrotic universe: Colliding branes and the origin of the hot big bang

doi:10.1103/PhysRevD.64.123522

Paper

The Ekpyrotic universe: Colliding branes and the origin of the hot big bang

Published Mar 29, 2001 ·

Physical Review D

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Abstract

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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Study Snapshot

The hot big bang universe is produced by the collision of a brane with a bounding orbifold plane, addressing cosmological horizon, flatness, and monopole problems without invoking superluminal expansion.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

The Ekpyrotic universe: Colliding branes and the origin of the hot big bang

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