Emergent universe in theories with natural UV cutoffs

Abstract

We investigate the realization of the emergent universe scenario in theories with natural UV cutoffs, namely a minimum length and a maximum momentum, quantified by a new deformation parameter in the generalized uncertainty principle. We extract the Einstein static universe solutions and we examine their stability through a phase-space analysis. As we show, the role of the new deformation parameter is crucial in a twofold way: Firstly, it leads to the appearance of new Einstein static universe critical points, that are absent in standard cosmology. Secondly, it provides a way for a graceful exit from the Einstein static universe into the expanding thermal history, that is needed for a complete and successful realization of the emergent universe scenario.

9 pages, 5 figures, version published in Class.Quant.Grav

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• Power spectrum of primordial perturbations for an emergent universe in quantum reduced loop gravity
• Emergent Universe Scenario, Bouncing and Cyclic Universes in Degenerate Massive Gravity
• Probing Planck Scale Spacetime By Cavity Opto-Atomic ${}^{87}$Rb Interferometry
• Non-singular model universe from a perfect fluid scalar-metric cosmology
• CMB power spectrum for emergent scenario and slow expansion in scalar-tensor theory of gravity
• Emergent universe: tensor perturbations within the CSL framework
• Emergent universe revisited through the CSL theory
• Quantum Cosmology with Dynamical Vacuum in a Minimal-Length Scenario
• Emergent Cosmology in 4D Einstein Gauss Bonnet Theory of Gravity
• Superfluids in Polymer Quantum Mechanics
• Stability of the Einstein Static Universe in Zero-Point Length Cosmology with Topological Defects
• A winding number analysis of Schwarzschild black hole stability in light of Planck-scale modified kinematics