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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:An exact solution of the Einstein equations describing an arbitrary number of non-parallel straight infinitely long cosmic strings of zero thickness moving with different constant velocities and arbitary impact parameters is constructed in a single-coordinate patch. The causal structure of the spacetime is briefly studied and conditions am found for the appearance of non-causal light cones. The generalization of the solution to include plane symmetric topological defects is mentioned.