Faculty of Physics
M.V. Lomonosov Moscow State University
Regular Article

# Application of the nonparametric methods of mathematical statistics to search for cosmic strings

## A. V. Morgunova$^1$, O. S. Sazhina$^2$

### Moscow University Physics Bulletin 2019. N 5.

• Article
Annotation

A statistical study of the area, which according to the radio data of CMB anisotropy contains a candidate for the cosmic string (field CSc-1), was carried out in order to additional justification of this candidate. Cosmic strings are one-dimensional cosmological-scale objects, which may manifest itself in particular as a gravitational lenses with special features. It was solved the problem of statistical comparison of the distribution density of gravitational-lens pairs of sources (galaxies) in fields that do not contain cosmic strings with the distribution of similar pairs in the CSc-1 field. Nonparametric rank shift criteria were used to work with small samples under an unknown distribution law; the limits of applicability of the criteria were discussed. The revealed difference between the two distributions serves as an additional argument in favor of the presence of a string in the CSc-1 field. The discovery of cosmic strings would serve as a unique observational test of modern cosmological theories, including multidimensional models.

Approved: 2020 February 19
PACS:
98.80.-k Cosmology
95.75.Mn Image processing
Rissian citation:
А. В. Моргунова, О. С. Сажина.
Вестн. Моск. ун-та. Сер. 3. Физ. Астрон. 2019. № 5. С. 86.
Authors
A. V. Morgunova$^1$, O. S. Sazhina$^2$
$^1$Moscow State University, Physics Faculty
$^2$MSU, Sternberg astronomical institute

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