Gravitational Wave Bursts from Cusps and Kinks on Cosmic Strings

Details Gravitational Wave Bursts from Cusps and Kinks on Cosmic Strings Gravitational Wave Bursts from Cusps and Kinks on Cosmic Strings

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001stin...0178202d&link_type=abstract

Technical Report, PB2001-106893; IHES/P-01/15 ; Dept. of Physics and Astronomy

Astronomy and Astrophysics

Astronomy

Cosmology, Gravitational Waves, Bursts, String Theory, Gravitation Theory, Astronomy, Supersymmetry, Background Radiation, Stochastic Processes

Scientific paper

The strong beams of high-frequency gravitational waves (GW) 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 in only 10% of all string loops have cusps these bursts might be detectable by the planned GW detectors LIGO/VIRGO and LISA for string tensions as small as G(mu) approximately 10(sup -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 G(mu) approximately 10(sup -12). The authors show that the strongly non Guassian nature of the stochastic GW's generated by strings modifies the usual derivation of constraints on G(mu) from pulsar timing experiments. In particular the usually considered 'rms GW background' is, when G(mu) approximately or > 10(sup -7), an overestimate of the more relevant confusion GW noise because it includes rare, intense bursts.

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