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

Solution of Einstein's equations for a closed null string with axial symmetry, radially increasing its size

A. P. Lelyakov, O. V. Haneychuk

Moscow University Physics Bulletin 2020. N 1.

  • Article

In this work, we have found a solution to the Einstein equations for a closed null string with axial symmetry, which radially increases its size. The possibility of choosing the ideal gas of null-strings as a dominant source of gravity is confirmed in the study of the null-string inflation mechanism in Friedman-Robertson-Walker spaces. The absence of a limit transition between the solution found and the solution for a closed null string in shape of a circle that changes its size radially is shown. This indicate a stability of configuration of a closed null string in shape of a circle during motion in an external gravitational field. It has been noted that a part of characteristics of null string gas, such as an ability to form a domain structure and an existence of stable polarized states (multi-string systems), does not depend on a shape of a null-string, but the dynamics of a test null string in a field of such a multi-string system will have peculiarities.

Received: 2019 July 31
Approved: 2020 June 1
04.20.Jb Exact solutions
11.27.+d Extended classical solutions; cosmic strings, domain walls, texture
Rissian citation:
А. П. Леляков, О. В. Ханейчук.
Решение уравнений Эйнштейна для замкнутой нуль-струны с осевой симметрией, радиально увеличивающей свой размер.
Вестн. Моск. ун-та. Сер. 3. Физ. Астрон. 2020. № 1. С. 18.
A. P. Lelyakov, O. V. Haneychuk
$^1$Crimean Federal University
Issue 1, 2020

Moscow University Physics Bulletin

Science News of the Faculty of Physics, Lomonosov Moscow State University

This new information publication, which is intended to convey to the staff, students and graduate students, faculty colleagues and partners of the main achievements of scientists and scientific information on the events in the life of university physicists.