2011/12/31 by Houri Ziaeepour, H. Ziaeepour
Physics and Astronomy · #Anisotropy #Astrophysics #Cold dark matter #Context (archaeology) #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Deceleration parameter #Galaxies: Formation, Evolution, Phenomena #Luminosity distance #Particle physics #Physics #Planck #Quantum mechanics #Quintessence #Redshift #Theoretical physics #Universe #astro-ph.CO #gr-qc #hep-ph
paper · pdf · doi:10.1103/physrevd.86.043503
published as Phys. Rev. D86 (2012) 043503 · 34 pages, 1 figure. v3: version accepted for publication in PRD
arxiv created 2012/07/03 · openalex publication_date 2012/08/02 · arxiv updated 2012/08/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In the past decade or so observations of supernovae, large scale structures, and the cosmic microwave background have confirmed the presence of what is called dark energy---the cause of the accelerating expansion of the Universe. Its density has also been measured as well as the value of other cosmological parameters according to the concordance \ensuremathΛCDM model with few percent uncertainties. The next generation of surveys should allow to constrain this model with better precision or to distinguish between a \ensuremathΛCDM and alternative models such as modified gravity and (interacting)-quintessence models. In this work we parametrize both the homogeneous and anisotropic components of matter density in the context of interacting dark energy models with the goal of discriminating between f(R) modified gravity and its generalizations, and interacting dark energy models, for which we also propose a phenomenological description of energy-momentum conservation equations inspired by particle physics. It is based on the fact that the simplest interactions between particles/fields are elastic scattering and decay. The parametrization of the growth rate proposed here is nonetheless general and can be used to constrain other interactions. As an example of applications, we present an order of magnitude estimation of the accuracy of the measurement of these parameters using Euclid and Planck surveys data, and leave a better estimation to a dedicated work.