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A. S. Lo (Northrop Grumman Space Technology), E. L. Wright (UCLA)
We report a search for signatures of cosmic strings in the the Cosmic Microwave Background data from the Wilkinson Microwave Anisotropy Probe. We used a digital filter designed to search for individual cosmic strings and found no evidence for them in the WMAP CMB anisotropies to a level of \Delta T/T greater than 0.29 mK. This corresponds to an absence of cosmic strings with G\mu less than 1.07 10-5 for strings moving with velocity v = c/2. Unlike previous work, this limit does not depend on an assumed string abundance. We have searched the WMAP data for evidence of a cosmic string recently reported as the CSL-1 object, and found an edge with 2 \sigma significance. However, if this edge is real and produced by a cosmic string, it would have to move at velocity greater than 0.94c. We also present preliminary limits on the CMB data that will be returned by the PLANCK satellite for comparison. With the available information on the PLANCK satellite, we calculated that it would be twice as sensitive to cosmic strings as WMAP.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.