Testing gravity with CAMB and CosmoMC

Details Testing gravity with CAMB and CosmoMC Testing gravity with CAMB and CosmoMC

2011-06-22

arxiv.org/abs/1106.4543v2

JCAP 1108:005,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

11 pages, 3 figures, 1 table; The new MGCAMB patch is available at http://www.sfu.ca/~aha25/MGCAMB.html

Scientific paper

10.1088/1475-7516/2011/08/005

We introduce a patch to the commonly used public codes CAMB and CosmoMC that allows the user to implement a general modification of the equations describing the growth of cosmological perturbations, while preserving the covariant conservation of the energy-momentum. This patch replaces the previously publicly released code MGCAMB, while also extending it in several ways. The new version removes the limitation of late-time-only modifications to the perturbed Einstein equations, and includes several parametrization introduced in the literature. To demonstrate the use of the patch, we obtain joint constraints on the neutrino mass and parameters of a scalar-tensor gravity model from CMB, SNe and ISW data as measured from the correlation of CMB with large scale structure.

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