Rapidly Descending Dark Energy and the End of Cosmic Expansion

Abstract

If dark energy is a form of quintessence driven by a scalar field $\varphi$ evolving down a monotonically decreasing potential $V(\varphi )$ that passes sufficiently below zero, the universe is destined to undergo a series of smooth transitions. The currently observed accelerated expansion will cease; soon thereafter, expansion will come to end altogether; and the universe will pass into a phase of slow contraction. In this paper, we consider how short the remaining period of expansion can be given current observational constraints on dark energy. We also discuss how this scenario fits naturally with cyclic cosmologies and recent conjectures about quantum gravity.

12 pages, 4 figures

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• A small Universe
• How Slowly can the Early Universe Expand?
• How Much NEC Breaking Can the Universe Endure?
• Dynamical system analysis in descending dark energy model
• Closer look at cosmological consequences of interacting group field theory
• Evolution of perturbations in a universe with exotic solid-like matter
• Delicate curvature bounces in the no-boundary wave function and in the late universe
• Galileon versus Quintessence: A comparative phase space analysis and late-time cosmic relevance
• Apocalypse When? Solar System Constraints on an Imminent Big Rip