Radiation-dominated bouncing model with slow contraction and inflation

Abstract

A very simple non-singular inflationary model is presented where the unique matter content is a radiation fluid. The model slowly contracts from a very large, almost empty and flat spacetime and realizes a bounce. It is then launched to a quasi-de Sitter inflationary expansion with more than sixty e-folds, which smoothly changes to the usual classical, decelerated radiation-dominated expansion before nucleosynthesis. The initial contracting and final expanding phases are classical, but the intermediate bounce and inflationary phases are induced by quantum cosmological effects emerging from a Gaussian wave function quickly moving in configuration space. During this quantum era, a huge number of photons is created. The scale factor describing all this rich evolution is a surprisingly simple analytic function of conformal time. The cosmological scalar perturbations arising from quantum vacuum fluctuations in the far past of the model present an almost scale invariant spectrum with an amplitude compatible with observations for reasonable values of the free parameters of the model.

14 pages, 5 figures

References in corpus (12)

• Higgs inflation: consistency and generalisations
• Towards a Nonsingular Bouncing Cosmology
• Cosmology without inflation
• A non inflationary model with scale invariant cosmological perturbations
• Scalar and Vector Perturbations in Quantum Cosmological Backgrounds
• Quantum geometrodynamics: whence, whither?
• Particle Creation in Bouncing Cosmologies
• Supersmoothing through Slow Contraction
• Nonsingular bouncing cosmology in general relativity: physical analysis of the spacetime defect
• An Overview on the Nature of the Bounce in LQC and PQM
• A radiation-like era before inflation
• The role of spatial curvature in constraining the Universe anisotropies across a Big Bounce

Cited by in corpus (3)

• Relaxation of first-class constraints and the quantization of gauge theories: from "matter without matter" to the reappearance of time in quantum gravity
• Non-Singular Bouncing cosmology from Phantom Scalar-Gauss-Bonnet Coupling: Reconstruction with Observational Insights
• Quantum Gravity Corrections to the inflationary spectrum in a Bohmian approach