Testing gravity with CAMB and CosmoMC

By A. Hojjati, Levon Pogosian, Gong-Bo Zhao. 2011

203 citations recorded by the source corpus.

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 parametrizations 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.

Subfields: Artificial Intelligence, Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/5b21f796382f2d94197239f144ea3ff76b205fdd

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

In Astronomy and Astrophysics

In Nuclear and High Energy Physics

Citations in the corpus

Effective field theory of dark energy: A review (2019, background): “depend on the cosmological model assumed [283, 284, 285, 286, 287, 242, 288].”
CFHTLenS: testing the laws of gravity with tomographic weak lensing and redshift-space distortions (2012, methodology): “A customised version of MGCAMB (Hojjati et al. 2011; Lewis et al. 2000) was used to evaluate the CMB anisotropies for a given set of cosmological parameters, which are then assessed with the WMAP likelihood code1.”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, unknown): “This parameterization has been widely employed [131, 277, 587, 115, 737, 980, 320, 441, 442].”
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Constraining modified gravity (2016, methodology): “When comparing measurements made in different analyses, or in implementations in packages such as MGCAMB, which uses the {γ | slip} assumption, it is important to understand which model is being used.”
Accurate halo-model matter power spectra with dark energy, massive neutrinos and modified gravitational forces (2016, methodology): “The linear spectrum for the ‘ f (R) and massive neutrino’ case is calculated using MG-CAMB (Hojjati et al. 2011b,a), but we find that the approximation of treating the two effects separately and then combining them is almost perfect for the linear spectra (within a per cent for k < 10hMpc−1).”
Tension and constraints on modified gravity parametrizations of $G_{\textrm{eff}}(z)$ from growth rate and Planck data (2017, methodology): “We anticipate (and verify with MGCAMB below) that Geff(z) affects only the large angular CMB spectrum scales (low-`) through the Integrated Sachs Wolfe (ISW) effect while smaller scales (the acoustic peaks) depend only on the background H(z) through the angular diameter distance dA = c H0 1 1+z ∫ z ”