A probability estimate for scalar-field homogeneity at the onset of inflation and slow contraction concludes that, after optimizing over initial spectra, inflation is vastly more likely than ekpyrosis to have the required smooth initial patch.
Sourcing curvature modes with entropy perturbations in non-singular bouncing cosmologies
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The observed temperature fluctuations in the cosmic microwave background can be traced back to primordial curvature modes that are sourced by adiabatic and/or entropic matter perturbations. In this paper, we explore the entropic mechanism in the context of non-singular bouncing cosmologies. We show that curvature modes are naturally generated during `graceful exit,' i.e., when the smoothing slow contraction phase ends and the universe enters the bounce stage. Here, the key role is played by the kinetic energy components that come to dominate the energy density and drive the evolution towards the cosmological bounce.
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Probability of the Initial Conditions for Inflation and Slow Contraction
A probability estimate for scalar-field homogeneity at the onset of inflation and slow contraction concludes that, after optimizing over initial spectra, inflation is vastly more likely than ekpyrosis to have the required smooth initial patch.