ISiTGR: A Software Package for Testing General Relativity at Cosmological Scales.

Mathematics – Logic

Scientific paper

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Scientific paper

Motivated not only by the problem of cosmic acceleration, but also by the proposals of some extensions to general relativity that would manifest themselves at cosmological scales, the testing of general relativity at cosmological scales has gained increasing popularity. To help test the consistency of general relativity and other gravity theories with current and future data, we introduce the package ISiTGR: Integrated Software in Testing General Relativity. ISiTGR is an integrated set of modified modules for the publicly available packages CosmoMC and CAMB, including a modified version of the ISW-galaxy cross correlation module of Ho et al and a new weak-lensing likelihood module for the refined HST-COSMOS weak gravitational lensing tomography data. We review recently proposed approaches to evolving the modified growth parameters as well as our newly proposed method that avoids some common problems of those approaches. We give some results to illustrate the use of ISiTGR.

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