1112.6025 (Houri Ziaeepour)
Houri Ziaeepour
In the past decade or so observations of supernovae, Large Scale Structures
(LSS), and Cosmic Microwave Background (CMB) have confirmed the presence of
what is called dark energy, and measured its density as well as the value of
other cosmological parameters according to concordance - Lambda-CDM model with
few percent uncertainties. Next generation of surveys will allow to distinguish
between a Lambda-CDM and alternative models such as modified gravity and
(interacting)-quintessence models. In this work we parametrize homogeneous and
anisotropic components of matter density in the context of interacting dark
energy models with the goal discriminating between f(R) modified gravity and
its generalization, 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 growth rate proposed here is nonetheless general
and can be used to constrain other interactions. We also present a crude
estimation of the accuracy of the measurement of these parameters using Euclid
and Planck surveys data.
View original:
http://arxiv.org/abs/1112.6025
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