Dark energy, matter creation and curvature

Abstract

The most studied way to explain the current accelerated expansion of the universe is to assume the existence of dark energy; a new component that fill the universe, does not clumps, currently dominates the evolution, and has a negative pressure. In this work I study an alternative model proposed by Lima et al. \cite{lima96}, which does not need an exotic equation of state, but assumes instead the existence of gravitational particle creation. Because this model fits the supernova observations as well as the $\Lambda$CDM model, I perform in this work a thorough study of this model considering an explicit spatial curvature. I found that in this scenario we can alleviate the cosmic coincidence problem, basically showing that these two components, dark matter and dark energy, are of the same nature, but they act at different scales. I also shown the inadequacy of some particle creation models, and also I study a previously propose new model that overcome these difficulties.

6 pages, 4 figures. Accepted for publication in EPJC. arXiv admin note: substantial text overlap with arXiv:0812.3865

References in corpus (6)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Dark energy and dark matter as curvature effects
• An Accelerating Cosmology Without Dark Energy
• Strategies for Determining the Nature of Dark Matter
• Cosmographic Degeneracy

Cited by in corpus (11)

• f(R,T) gravity
• Thermodynamic interpretation of the generalized gravity models with geometry - matter coupling
• Matter creation and cosmic acceleration
• Challenging matter creation models in the phantom divide
• Cosmic expansion with matter creation and bulk viscosity
• Dark side of the universe in the Stephani cosmology
• Observational Hubble parameter data constraints on the interactive model of $f(T)$ gravity with particle creation
• Emulating dark energy models with known equation of state via the created cold dark matter scenario
• Accelerated Expansion of the universe based on Particle Creation-Destruction Processes and Dark Energy in FLRW universes
• Exploring the cosmological degeneracy between decaying dark matter model and viscous $\Lambda$CDM
• Correspondence between particle creation and dark components interaction in the context of $f(\mathcal{G})$ gravity