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The ekpyrotic universe, or ekpyrotic scenario, is a cosmological model of the origin and shape of the universe. The ekpyrotic model of the universe is an [alternative] to the standard cosmic [inflation] model for the very early universe and is a precursor to, and part of, some cyclic models of the universe.
The ekpyrotic model came out of work by Neil Turok and Paul Steinhardt and maintains that the universe did not start in a [singularity], but came about from the collision of two branes. This collision avoids the primordial singularity and superluminal expansion of spacetime while preserving nearly scale-free density fluctuations and other features of the observed universe. The ekpyrotic model is cyclic, though collisions between branes are rare on the time scale of the expansion of the universe to a nearly featureless flat expanse. Observations that may distinguish between the ekpyrotic and inflationary models include polarization of the cosmic microwave background radiation and frequency [distribution] of the gravitational wave spectrum.

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