Cosmology
The two-point correlation function is a statistical tool used in cosmology to quantify the degree of clustering of objects, such as galaxies, in the universe. It measures how the density of objects at one point in space relates to the density at another point, providing insight into the large-scale structure of the cosmos. This function helps in understanding how structures are distributed over different scales and is closely related to power spectra, which describe the distribution of matter in terms of its spatial frequencies.
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