Dark matter interacts with variable vacuum energy

2014/05/31 by Iván E. Sánchez G., Iván E. Sánchez G
Physics and Astronomy · #Age of the universe #Anisotropy #Astrophysics #Baryon #Big Bang nucleosynthesis #Black Holes and Theoretical Physics #Cosmic background radiation #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hubble's law #Nucleosynthesis #Omega #Physics #Planck #Quantum mechanics #Quasar #Redshift #Stars #Theoretical physics #Universe #Vacuum energy #gr-qc #hep-th

paper · pdf · doi:10.1007/s10714-014-1769-0

published as General Relativity and Gravitation vol. 46, 1769 (2014) · 8 pages, 12 figures. arXiv admin note: text overlap with arXiv:1310.5335 by other authors

openalex publication_date 2014/07/24 · arxiv created 2014/09/21 · arxiv updated 2015/08/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We investigate a spatially flat Friedmann-Robertson-Walker (FRW) scenario with two interacting components, dark matter and variable vacuum energy (VVE) densities, plus two decoupled components, one is a baryon term while the other behaves as a radiation component. We consider a linear interaction in the derivative dark component density. We apply the χ² method to the observational Hubble data for constraining the cosmological parameters and analyze the amount of dark energy in the radiation era for the model. It turns out that our model fulfills the severe bound of Ω_x(z≃ 1100)<0.009 at 2σ level, so is consistent with the recent analysis that includes cosmic microwave background anisotropy measurements from Planck survey, the future constraints achievable by Euclid and CMBPol experiments, reported for the behavior of the dark energy at early times, and fulfills the stringent bound Ω_x(z≃ 10¹⁰)<0.04 at 2σ level in the big-bang nucleosynthesis epoch. We also examine the cosmic age problem at high redshift associated with the old quasar APM 08279+5255 and estimate the age of the universe today.

Citations

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