Stochastic Gravitational Wave Background from Light Cosmic Strings

Details Stochastic Gravitational Wave Background from Light Cosmic Strings Stochastic Gravitational Wave Background from Light Cosmic Strings

2007-02-13

arxiv.org/abs/astro-ph/0702335v3

Phys.Rev.D75:125006,2007

Astronomy and Astrophysics

Astrophysics

14 pgs, 7 fig, small text addition and reference added, accepted by Phys. Rev. D

Scientific paper

10.1103/PhysRevD.75.125006

Spectra of the stochastic gravitational wave backgrounds from cosmic strings are calculated and compared with present and future experimental limits. Background spectra are calculated numerically for dimensionless string tensions G mu/c^2 between 10^{-7} and 10^{-18}, and initial loop sizes as a fraction of the Hubble radius, alpha, from 0.1 to 10^{-6}. The spectra of the cosmic string backgrounds are compared with current millisecond pulsar limits and LISA sensitivity curves. For models with large stable loops (alpha=0.1), current pulsar-timing limits exclude G mu/c^2>10^{-9} and within the range of current models based on brane inflation. LISA may detect a background from strings as light as G mu/c^2 10^{-16}, corresponding to field-theory strings formed at roughly 10^{11} GeV.

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