Friday, December 30, 2011

1112.6025 (Houri Ziaeepour)

Discrimination between Lambda-CDM, quintessence, and modified gravity models using wide area surveys    [PDF]

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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