Distributions of quasars as an indicator of the homogeneity or inhomogeneity in the Universe

Abstract

Abstract Quasars are perhaps the brightest extragalactic sources and thanks to their brightness they are visible at great distances. By studying the distribution of quasars in the Universe, it is possible to determine whether there are large-scale inhomogeneities in the Universe or not. If the distribution of quasars at large distances is not uniform, the same can be said also about the Universe. At small distances, quasars either do not exist, or their number is very small. Therefore, the distribution of quasars at small distances is very conditional, and we cannot draw any conclusions about the homogeneity of the Universe there based on the distribution of quasars. Therefore, the distribution of quasars allows us to determine the distribution of matter at large distances, which we use to detect large-scale inhomogeneities in the Universe.