Version 1.2

What is ISiTGR?

ISiTGR is an integrated set of modified modules for the software package CosmoMC for use in testing whether observational data is consistent with general relativity on cosmological scales. This latest version of the code has been updated to allow for the consideration of non-flat universes. It incorporates modifications to the codes: CAMB, CosmoMC, the ISW-galaxy cross correlation likelihood code of Ho et al, and two of our independently developed weak lensing likelihood codes: one for the CFHTLenS weak lensing tomography of Heymans et al; and one for the refined COSMOS 3D weak lensing tomography of Schrabback et al.

A detailed explanation of the modifications made to these codes allowing one to test general relativity are described in our papers: arXiv:1109.4583, arXiv:1205.2422, and arXiv:1501.03119.

How to get ISiTGR

Two versions of ISiTGR are available. The normal version of ISiTGR uses a functional form to evolve the parameters used to test general relativity and is available here. ISiTGR_BIN, on the other hand, gives you two options to evovle the parameters used to test general relativity. The first option is to bin the parameters in two redshift and two scale bins, alternatively one can use the hybrid evolution method, as seen in our paper, where scale dependence evolves monotonically, but redshift dependence is binned. That code can be downloaded here.

Downoad Here: ISiTGR ISiTGR_BIN


The original (flat only) verison of ISiTGR as well as builds for other versions of CosmoMC are available here (this version is for CosmoMC 12/2013).

Running ISiTGR. (ReadMe)

To run ISiTGR you must first download and install CosmoMC (December 2013 version). You can find download instructions, system requirements, and setup instructions for CosmoMC in the CosmoMC ReadMe. Then, simply copy the contents of the unzipped ISiTGR folder to the CosmoMC folder, edit the Makefile for your compilers, compile (extra compiling step here), and you are ready to go. Detailed explanations of the specific options available in each of the ISiTGR codes are availalble in the ISiTGR ReadMe.

Referencing ISiTGR.

We would ask that when using ISiTGR or a modified version of it, you cite: our papers (arXiv:1109.4583 and arXiv:1205.2422), this website; the original CAMB paper; the original CosmoMC paper; and the papers on original ISW-galaxy cross correlation likelihood by Ho et al and Hirata et al. When using the CFHTLenS weak lensing tomography likelihood, please cite our paper, Heymans et al, and follow the CFHTLenS publication guidlines given here. If the refined HST COSMOS 3D weak lensing tomography likelihood in our code is used, the papers by Schrabback et al., Scoville et al., and Ilbert et al should be cited.  Additionally please cite the use of any other datasets already included in the original version of CosmoMC.

Version History

1.2 (Released 01/25/15, this version): Updates for Dec. 2013 version of CosmoMC, new CFHTLenS likelihood module.

1.1.1 (Released 05/29/13): Includes bug fixes (Special thanks to Ana Caramete and Lucia Popa).

1.1: Updated code to allow for non-flat universes when varying the MG parameters.

1.02.2 (Released 05/29/13): Includes bug fixes.

1.02: Updated to January 2012 version of CosmoMC.

1.01.2 (Released 05/29/13): Includes bug fixes.

1.01: Updated to October 2011 version of CosmoMC. BAO module now comes included in CosmoMC (Thanks to Antony Lewis).

1.0.1 (Released 05/29/13): Includes bug fixes.

1.0: Initial release, for August 2011 version of CosmoMC.


If you have any question or comments about ISiTGR or would like to be updated about with future changes to the code, please feel free to email Jason Dossett at: