Testing a Phenomenologically Extended DGP Model with Upcoming Weak Lensing Surveys

Details Testing a Phenomenologically Extended DGP Model with Upcoming Weak Lensing Surveys Testing a Phenomenologically Extended DGP Model with Upcoming Weak Lensing Surveys

2011-01-13

arxiv.org/abs/1101.2560v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

22 pages, 5 figures, 4 tables, JCAP in press

Scientific paper

A phenomenological extension of the well-known brane-world cosmology of Dvali, Gabadadze and Porrati (eDGP) has recently been proposed. In this model, a cosmological-constant-like term is explicitly present as a non-vanishing tension sigma on the brane, and an extra parameter alpha tunes the cross-over scale r_c, the scale at which higher dimensional gravity effects become non negligible. Since the Hubble parameter in this cosmology reproduces the same LCDM expansion history, we study how upcoming weak lensing surveys, such as Euclid and DES (Dark Energy Survey), can confirm or rule out this class of models. We perform Markov Chain Monte Carlo simulations to determine the parameters of the model, using Type Ia Supernov\ae, H(z) data, Gamma Ray Bursts and Baryon Acoustic Oscillations. We also fit the power spectrum of the temperature anisotropies of the Cosmic Microwave Background to obtain the correct normalisation for the density perturbation power spectrum. Then, we compute the matter and the cosmic shear power spectra, both in the linear and non-linear regimes. The latter is calculated with the two different approaches of Hu and Sawicki (2007) (HS) and Khoury and Wyman (2009) (KW). With the eDGP parameters coming from the Markov Chains, KW reproduces the LCDM matter power spectrum at both linear and non-linear scales and the LCDM and eDGP shear signals are degenerate. This result does not hold with the HS prescription: Euclid can distinguish the eDGP model from LCDM because their expected power spectra roughly differ by the 3sigma uncertainty in the angular scale range 700

Affiliated with

Also associated with

No associations

Rating

Testing a Phenomenologically Extended DGP Model with Upcoming Weak Lensing Surveys does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Testing a Phenomenologically Extended DGP Model with Upcoming Weak Lensing Surveys, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing a Phenomenologically Extended DGP Model with Upcoming Weak Lensing Surveys will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-66551