Gravitational radiation from cosmic string splitting on a Friedmann-Robertson-Walker background

Details Gravitational radiation from cosmic string splitting on a Friedmann-Robertson-Walker background Gravitational radiation from cosmic string splitting on a Friedmann-Robertson-Walker background

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.178..303g&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 178, no. 2, April 1991, p. 303-309.

Astronomy and Astrophysics

Astrophysics

Cosmology, Gravitational Waves, String Theory, Astronomical Models, Einstein Equations, Space-Time Functions

Scientific paper

Exact solutions of Einstein's equations that may be interpreted as representing the splitting of a primordial cosmic string imbedded in a perfect fluid Friedmann-Robertson-Walker (FRW) cosmology are presented. The splitting leads to the creation of a bubble whose boundary is given by a gravitational shock wave, expanding from the point of splitting, associated to the motion of the free ends of the string. Inside the bubble there is a perturbed FRW metric. This perturbation is lagest near the string ends, producing a sort of wake along the path of the free ends, but decreases rapidly with time and the metric approaches the FRW regime locally everywhere inside the bubble. Similar results are shown to hold also for flat vacuum de Sitter space-times.

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