Gravitational radiation from rotating monopole-string systems

Details Gravitational radiation from rotating monopole-string systems Gravitational radiation from rotating monopole-string systems

2004-11-30

arxiv.org/abs/astro-ph/0411794v2

Phys.Rev.D71:044028,2005

Astronomy and Astrophysics

Astrophysics

8 pages, 2 figures, revtex4; v2: minor corrections, matches published version

Scientific paper

10.1103/PhysRevD.71.044028

We study the gravitational radiation from a rotating monopole-antimonopole pair connected by a string. While at not too high frequencies the emitted gravitational spectrum is described asymptotically by $P_n\propto n^{-1}$, the spectrum is exponentially suppressed in the high-frequency limit, $P_n\propto \exp(-n/n_{\rm cr})$. Below $n_{\rm cr}$, the emitted spectrum of gravitational waves is very similar to the case of an oscillating monopole pair connected by a string, and we argue therefore that the spectrum found holds approximately for any moving monopole-string system. As application, we discuss the stochastic gravitational wave background generated by monopole-antimonopole pairs connected by strings in the early Universe and gravitational wave bursts emitted at present by monopole-string networks. We confirm that advanced gravitational wave detectors have the potential to detect a signal for string tensions as small as $G\mu\sim 10^{-13}$.

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