Interacting dark sector with variable vacuum energy

• Main Authors: Chimento, Luis P., Richarte, Martín G., García, Iván E. Sánchez
• Format: Text
• Language: unknown
• Published: arXiv 2013
• Subjects: General Relativity and Quantum Cosmology gr-qc; Cosmology and Nongalactic Astrophysics astro-ph.CO; High Energy Physics - Phenomenology hep-ph; FOS Physical sciences; South Pole; Hubble; South pole
• Online Access: https://dx.doi.org/10.48550/arxiv.1310.5335; https://arxiv.org/abs/1310.5335

We examine a cosmological scenario where dark matter is coupled to a variable vacuum energy while baryons and photons are two decoupled components for a spatially flat Friedmann-Robertson-Walker spacetime. We apply the $χ^{2}$ method to the updated observational Hubble data for constraining the cosmological parameters and analyze the amount of dark energy in the radiation era. We show that our model fulfills the severe bound of $Ω_{x}(z\simeq 1100)<0.009$ at the $2σ$ level, so it is consistent with the recent analysis that includes cosmic microwave background anisotropy measurements from the Planck survey, the Atacama Cosmology Telescope, and the South Pole Telescope along with the future constraints achievable by the Euclid and CMBPol experiments, and fulfills the stringent bound $Ω_{x}(z\simeq 10^{10})<0.04$ at the $2σ$ level in the big-bang nucleosynthesis epoch. : 5 pages,3 figures, 2 tables. (http://prd.aps.org/abstract/PRD/v88/i8/e087301)