Geodesic
Dynamics of a~probe null string in the~gravitational field of a~closed null string radially collapsing in the~plane
Teoretičeskaâ i matematičeskaâ fizika, Tome 190 (2017) no. 1, pp. 162-178

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We consider the dynamics of a probe null string in the gravitational field of a closed ("thick") null string radially collapsing in a plane. Analysis of the obtained solutions suggests that there might exist several properties of a null-string gas interesting from the cosmological standpoint, such as acceleration of expansion or contraction, a granular structure of the gas, the emergence of stable polarized states, and a domain structure.
Keywords: null string, gravitational field, equation of motion. 
@article{TMF_2017_190_1_a11,
     author = {A. P. Lelyakov and A. S. Karpenko},
     title = {Dynamics of a~probe null string in the~gravitational field of a~closed null string radially collapsing in the~plane},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {162--178},
     publisher = {mathdoc},
     volume = {190},
     number = {1},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2017_190_1_a11/}
}
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A. P. Lelyakov; A. S. Karpenko. Dynamics of a~probe null string in the~gravitational field of a~closed null string radially collapsing in the~plane. Teoretičeskaâ i matematičeskaâ fizika, Tome 190 (2017) no. 1, pp. 162-178. http://geodesic.mathdoc.fr/item/TMF_2017_190_1_a11/