Published in Physical Review D, Volume 77, Issue 12, May 24, 2008, pages 1-8.
Copyright © 2008 American Physical Society. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society. The following article appeared in Physical Review D and may be found at http://dx.doi.org/10.1103/PhysRevD.77.123509.
We search Hubble Space Telescope Treasury Program images collected as part of the Great Observatories Origins Deep Survey for pairs of galaxies consistent with the gravitational lensing signature of a cosmic string. Our technique includes estimates of the efficiency for finding the lensed galaxy pair. In the north (south) survey field we find no evidence out to a redshift of greater than 0.5 (0.3) for cosmic strings to a mass per unit length limit of Gμ/c2 < 3.0 × 10−7 at 95% confidence limits (C.L.). In the combined 314.9 arcmin2 of the north and south survey fields this corresponds to a global limit on Ωstrings < 0.02. Our limit on Gμ/c2 is more than an order of magnitude lower than searches for individual strings in cosmic microwave background (CMB) data. Our limit is higher than other CMB and gravitational wave searches, however, we note that it is less model dependent than these other searches.