Physics - Astrophysics of Galaxies Physics - Cosmology and Nongalactic Astrophysics Physics - Earth and Planetary Astrophysics Physics - High Energy Astrophysical Phenomena Physics - Instrumentation and Methods for Astrophysics Physics - Solar and Stellar Astrophysics
Phys.Rev.D77:123509,2008 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
$G\mu<3.0x10^{-7}$ at 95% confidence limits (C.L.). In the combined 314.9
arcmin$^2$ of the north and south survey fields this corresponds to a global
limit on $\Omega_{strings}<0.02$. Our limit on $G\mu$ 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.