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Gravitational radiation from cosmic (super)strings: bursts, stochastic background, and observational windows

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arxiv hep-th/0410222 v2 pith:G6VUNEGV submitted 2004-10-22 hep-th astro-phgr-qc

Thibault Damour , Alexander Vilenkin This is my paper · ORCID
classification hep-thastro-phgr-qc
keywords stringscosmicnetworkbackgroundbeenburstsdatadiffer
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

The gravitational wave (GW) signals emitted by a network of cosmic strings are reexamined in view of the possible formation of a network of cosmic superstrings at the end of brane inflation. The reconnection probability $p$ of intersecting fundamental or Dirichlet strings might be much smaller than 1, and the properties of the resulting string network may differ significantly from those of ordinary strings (which have $p=1$). In addition, it has been recently suggested that the typical length of newly formed loops may differ by a factor $\epsilon \ll 1$ from its standard estimate. Here, we analyze the effects of the two parameters $p$ and $\epsilon$ on the GW signatures of strings. We consider both the GW bursts emitted from cusps of oscillating string loops, which have been suggested as candidate sources for the LIGO/VIRGO and LISA interferometers, and the stochastic GW background, which may be detectable by pulsar timing observations. In both cases we find that previously obtained results are \textit{quite robust}, at least when the loop sizes are not suppressed by many orders of magnitude relative to the standard scenario. We urge pulsar observers to reanalyze a recently obtained 17-year combined data set to see whether the large scatter exhibited by a fraction of the data might be due to a transient GW burst activity of some sort, e.g. to a near cusp event.

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Cited by 15 Pith papers

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