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We propose a mechanism borrowed from string theory which yields anon-singular transition from a phase of Ekpyrotic contraction to the expandingphase of Standard Big Bang cosmology. The same mechanism converts the initialvacuum spectrum of cosmological fluctuations before the bounce into ascale-invariant one, and also changes the spectrum of gravitational waves intoan almost scale-invariant one. The scalar and tensor tilts are predicted to bethe same, in contrast to the predictions from the "String Gas Cosmology"scenario. The amplitude of the gravitational wave spectrum depends on the ratioof the string scale to the Planck scale and may be in reach of upcomingexperiments.

Nonsingular Ekpyrotic Cosmology with a Nearly Scale-Invariant Spectrum of Cosmological Perturbations and Gravitational Waves