Coincidence Problem in an Oscillating Universe

Abstract

We analyze an oscillating universe model in brane world scenario. The oscillating universe cycles through a series of expansions and contractions and its energy density is dominated by dust matter at early-time expansion phase and by phantom dark energy at late-time expansion phase. We find that the period of the oscillating universe is not sensitive to the tension of the brane, but sensitive to the equation-of-state parameter $w$ of the phantom dark energy, and the ratio of the period to the current Hubble age approximately varies from 3 to 9 when the parameter $w$ changes from -1.4 to -1.1. The fraction of time that the oscillating universe spends in the coincidence state is also comparable to the period of the oscillating universe. This result indicates that the coincidence problem can be significantly ameliorated in the oscillating universe without singularity.

latex, 3 figures, to appear in Gen. Relativ. Grav

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Cited by in corpus (12)

• Phantom Dark Energy Models with Negative Kinetic Term
• Dark-Energy Dynamics Required to Solve the Cosmic Coincidence
• Anthropic versus cosmological solutions to the coincidence problem
• Coincidence Problem in $f(R)$ Gravity Models
• $w_d=-1$ in interacting quintessence model
• Cosmological bounds on oscillating dark energy models
• Oscillating Universe from inhomogeneous EoS and coupled dark energy
• Revisiting The Coincidence Problem in $f(R)$ Gravitation
• Crossing the Phantom divide line in the Chaplygin gas model
• Towards a possible solution for the coincidence problem: f(G) gravity as background
• Coincidence Problem in f(T) Gravity Models
• On Friedmann-Lema\^ıtre-Robertson-Walker cosmologies in non-standard gravity