Cosmic strings in an expanding spacetime

Details Cosmic strings in an expanding spacetime Cosmic strings in an expanding spacetime

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8728482s&link_type=abstract

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Physics

Cosmology, Expansion, Space-Time Functions, String Theory, Gravitational Fields, Inflating, Inhomogeneity, Oscillation Dampers, Perturbation, Symmetry, Time Dependence, Universe

Scientific paper

The stability of a static, infinitely long and straight vacuum string solution under inhomogeneous axisymmetric time-dependent perturbations is investigated. It is found to be perturbatively stable. The work is further extended by finding a string solution in an expanding Universe. The back reaction of the string on the gravitational field has been ignored. The background is assumed to be a Friedman-Robertson-Walker (FRW) cosmology. By numerically integrating the field equations in a radiation and matter dominated model, oscillatory solutions are discovered. The possible damping of these oscillations is discussed. For late times the solution becomes identical to the static one studied earlier.

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