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- W2058762993 abstract "The strong beams of high-frequency gravitational waves (GW's) emitted by cusps and kinks of cosmic strings are studied in detail. As a consequence of these beams, the stochastic ensemble of GW's generated by a cosmological network of oscillating loops is strongly non-Gaussian, and includes occasional sharp bursts that stand above the ``confusion'' GW noise made of many smaller overlapping bursts. Even if only 10% of all string loops have cusps these bursts might be detectable by the planned GW detectors Laser Interferometric Gravitation Observatory (LIGO)-VIRGO and Laser Interference Space Antenna (LISA) for string tensions as small as $Gensuremath{mu}ensuremath{sim}{10}^{ensuremath{-}13}.$ In the implausible case where the average cusp number per loop oscillation is extremely small, the smaller bursts emitted by the ubiquitous kinks will be detectable by LISA for string tensions as small as $Gensuremath{mu}ensuremath{sim}{10}^{ensuremath{-}12}.$ We show that the strongly non-Gaussian nature of the stochastic GW's generated by strings modifies the usual derivation of constraints on $Gensuremath{mu}$ from pulsar timing experiments. In particular the usually considered ``rms GW background'' is, when $Gensuremath{mu}ensuremath{lesssim}{10}^{ensuremath{-}7},$ an overestimate of the more relevant confusion GW noise because it includes rare, intense bursts. The consideration of the confusion GW noise suggests that a grand unified theory value $Gensuremath{mu}ensuremath{sim}{10}^{ensuremath{-}6}$ is compatible with existing pulsar data, and that a modest improvement in pulsar timing accuracy could detect the confusion noise coming from a network of cuspy string loops down to $Gensuremath{mu}ensuremath{sim}{10}^{ensuremath{-}11}.$ The GW bursts discussed here might be accompanied by gamma ray bursts." @default.
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- W2058762993 date "2001-08-24" @default.
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- W2058762993 title "Gravitational wave bursts from cusps and kinks on cosmic strings" @default.
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- W2058762993 doi "https://doi.org/10.1103/physrevd.64.064008" @default.
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