Dark energy, inflation and the cosmic coincidence problem

Abstract

We show that holographic dark energy could explain why the current dark energy density is so small, if there was an inflation with a sufficient expansion in the early universe. It is also suggested that an inflation with the number of e-folds $N\simeq 65$ may solve the cosmic coincidence problem in this context. Assuming the inflation and the power-law acceleration phase today we obtain approximate formulas for the event horizon size of the universe and dark energy density as functions of time. A simple numerical study exploiting the formula well reproduces the observed evolution of dark energy. This nontrivial match between the theory and the observational data supports both inflation and holographic dark energy models.

final version

References in corpus (5)

• Dynamics of dark energy
• Interacting holographic dark energy model in non-flat universe
• Bulk-Brane Interaction and Holographic Dark Energy
• Interacting holographic dark energy model and generalized second law of thermodynamics in non-flat universe
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Cited by in corpus (12)

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• Interacting new generalized Chaplygin gas
• Notes on interacting holographic dark energy model in a closed universe
• A quantitative criteria for the coincidence problem
• Causality Problem in a Holographic Dark Energy Model
• Reconstructing the interaction between the dark matter and holographic dark energy
• Holographic Dark Energy and Quantum Entanglement
• Is dark energy from cosmic Hawking radiation?
• Probing Lambda-DGP Braneworld Model
• Cosmology in holographic non-minimal derivative coupling theory: constraints from inflation and variation of gravitational constant
• Zero Cosmological Constant and Nonzero Dark Energy from Holographic Principle
• Evolution of cosmological event horizons in anisotropic universes