Looking for cosmic strings

Details Looking for cosmic strings Looking for cosmic strings

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..613v&link_type=abstract

Nature (ISSN 0028-0836), vol. 322, Aug. 14, 1986, p. 613, 614. NSF-supported research.

Astronomy and Astrophysics

Astronomy

40

Astronomical Models, Cosmology, Galactic Structure, Image Analysis, Quasars, Doppler Effect, Relativistic Velocity, Strings, Temperature Distribution

Scientific paper

Cosmic strings predicted in some grand unified theories can produce double images of distant galaxies and quasars, and it has been argued that some of the known double quasars may be due to strings. In most of the previous work on the gravitational effects of strings it was assumed either that the string is static or that both the string and its velocity are perpendicular to the line of sight. The author shows that in more general configurations the expressions for the angular separation of double images and for the temperature discontinuity δT/T of the microwave background across the string are modified by trigonometric and relativistic factors. More importantly, the line connecting the double images is not, in general, perpendicular to the apparent direction of the string (contrary to what one would naively expect).

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