SIToolBox : A package for Bayesian estimation of Statistical Isotropy violation in the CMB sky.
Even though the standard model of cosmology predicts a statistically isotropic (SI) CMB sky, the SI violation signals are always present in an observed sky-map. Given a completely statistically isotropic CMB, different cosmological artifacts, measurement effects, and unavoidable effects during data analysis etc. may lead to isotropy violation signals in an otherwise SI sky. Therefore, a proper data analysis technique should account for all these SI violation signals. It will help us to match the SI violation signals in the sky with the known isotropy violation signals and then conclude if there is any SI violation present in the intrinsic CMB sky. In one of our recent works, we derived a general Bayesian formalism for measuring the isotropy violation signals in the CMB sky for an idealized isotropic noise. In this paper, we have extended the formalism and develop a software package, SIToolBox, for measuring SI violation in presence of anisotropic noise and masking. The package will be made public through GitHub soon.
Publisher URL: http://arxiv.org/abs/1810.09470