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 10-8 in some regions of the cosmic string parameter space.
J. Aasi et al., "Constraints on Cosmic Strings from the Ligo-virgo Gravitational-Wave Detectors," Physical Review Letters, vol. 112, no. 13, American Physical Society (APS), Apr 2014.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.112.131101
Keywords and Phrases
Gravitational effects; Gravity waves; Astrophysical phenomena; Back reaction; Cosmic microwave backgrounds; Cosmic strings; Gravitational wave detectors; Parameter spaces; String tension; Upper limits; Cosmology
International Standard Serial Number (ISSN)
Article - Journal
© 2014 American Physical Society (APS), All rights reserved.
01 Apr 2014