Constraints on Cosmic Strings from the LIGO-Virgo Gravitational-Wave Detectors

J. Aasi et al. (LIGO Scientific Collaboration and Virgo Collaboration)
Phys. Rev. Lett. 112, 131101 – Published 4 April 2014

Abstract

Cosmic strings can give rise to a large variety of interesting astrophysical phenomena. Among them, powerful bursts of gravitational waves (GWs) produced by cusps are a promising observational signature. In this Letter we present a search for GWs from cosmic string cusps in data collected by the LIGO and Virgo gravitational wave detectors between 2005 and 2010, with over 625 days of live time. We find no evidence of GW signals from cosmic strings. From this result, we derive new constraints on cosmic string parameters, which complement and improve existing limits from previous searches for a stochastic background of GWs from cosmic microwave background measurements and pulsar timing data. In particular, if the size of loops is given by the gravitational backreaction scale, we place upper limits on the string tension Gμ below 108 in some regions of the cosmic string parameter space.

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  • Received 25 October 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.131101

© 2014 American Physical Society

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Vol. 112, Iss. 13 — 4 April 2014

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