Kolmogorov cosmic microwave background sky

TL;DR

This paper introduces a new Kolmogorov-based map of the CMB sky that highlights regions of different randomness levels, revealing anomalies like the Cold Spot and providing insights into cosmic inhomogeneities.

Contribution

The paper presents a novel Kolmogorov stochasticity map of the CMB sky that distinguishes Galactic and cosmic structures, offering a new tool for analyzing cosmic inhomogeneities.

Findings

Identification of the Cold Spot as a high randomness region

Discovery of a Northern Cold Spot with similar properties

Kolmogorov map complements existing CMB maps

Abstract

A new map of the sky representing the degree of randomness in the cosmic microwave background (CMB) temperature has been obtained. The map based on estimation of the Kolmogorov stochasticity parameter clearly distinguishes the contribution of the Galactic disk from the CMB and reveals regions of various degrees of randomness that can reflect the properties of inhomogeneities in the Universe. For example, among the high randomness regions is the southern non-Gaussian anomaly, the Cold Spot, with a stratification expected for the voids. Existence of its counterpart, a Northern Cold Spot with almost identical randomness properties among other low-temperature regions is revealed. By its informative power, Kolmogorov's map can be complementary to the CMB temperature and polarization sky maps.