2012/02/10 by Philippe Jetzer, Crescenzo Tortora
Physics and Astronomy · #astro-ph.CO
paper · pdf · doi:10.1088/1742-6596/354/1/012009
9 pages, 1 figure, to appear in the Proceedings of the 3rd Italian-Pakistani Workshop on Relativistic Astrophysics, Lecce 20-22 June 2011, published in Journal of Physics: Conference Series (JPCS)
arxiv created 2012/02/10 · arxiv updated 2015/06/04
We discuss the thermodynamic and dynamical properties of a variable dark energy model with density scaling as ρx ∝ (1+z)m, z being the redshift. These models lead to the creation/disruption of matter and radiation, which affect the cosmic evolution of both matter and radiation components in the Universe. In particular, we have studied the temperature-redshift relation of radiation, which has been constrained using a recent collection of cosmic microwave background (CMB) temperature measurements up to z ∼ 3. We find that, within the uncertainties, the model is indistinguishable from a cosmological constant which does not exchange any particles with other components. Future observations, in particular measurements of CMB temperature at large redshift, will allow to give firmer bounds on the effective equation of state parameter weff for such types of dark energy models.