Primordial perturbations with pre-inflationary bounce

Abstract

Based on the effective field theory (EFT) of nonsingular cosmologies, we build a stable model, without the ghost and gradient instabilities, of bounce inflation (inflation is preceded by a cosmological bounce). We perform a full simulation for the evolution of scalar perturbation, and find that the perturbation spectrum has a large-scale suppression (as expected), which is consistent with the power deficit of the cosmic microwave background (CMB) TT-spectrum at low multipoles, but unexpectedly, it also shows itself one marked lower valley, which actually provides a better fit to the dip at multipole $l\sim 20$. The depth of valley is relevant with the physics around the bounce scale, which is model-dependent.

arXiv comment23 pages, 19 figures;

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• Pre-inflation and Trans-Planckian Censorship
• Anomalies in the CMB from a cosmic bounce
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• Regularized-Renormalized-Resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation
• Implication of island for inflation and primordial perturbations
• Null energy condition violation and beyond Horndeski physics in light of DESI DR2 data
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• CMB power spectrum in the emergent universe with k-essence
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• Bouncing and inflationary dynamics in quantum cosmology in the de Broglie-Bohm interpretation
• Parity-violating primordial gravitational waves from null energy condition violation
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• Populating the landscape in an inhomogeneous universe
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• RRR fluctuations from non-singular bounce