Gravitational angular momentum radiation of cosmic strings

Details Gravitational angular momentum radiation of cosmic strings Gravitational angular momentum radiation of cosmic strings

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nuphb.328..238d&link_type=abstract

Nuclear Physics B, Volume 328, Issue 1, p. 238-271.

Physics

Nuclear Physics

21

Scientific paper

Gravitational radiation from non-superconducting cosmic string loops is studied with special emphasis on the angular momentum radiation. A general formula for gravitational angular momentum radiation of periodic sources is derived. The total radiation is found to be E˙ = γEGμ2, P˙ = γPGμ2 and L˙ = γLLGμ2, with γE ~ 80, γP ~ 5, γL ~ 5. Here μ denotes the linear energy density of the string and L is its length. The direction of L˙ is always exactly opposite to the angular momentum of the string itself. Due to gravitational radiation of momentum, the loop recoils and accelerates like a rocket. Angular momentum radiation can not prevent this rocket effect and since the strings are formed with relatively high initial velocities, dynamical friction most probably never becomes important.

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