Astronomical constraints on a string-dominated universe

Details Astronomical constraints on a string-dominated universe Astronomical constraints on a string-dominated universe

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.227..453g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 227, July 15, 1987, p. 453-459.

Mathematics

Logic

46

Astronomical Models, Constraints, String Theory, Universe, Cosmology, Density Distribution, Gravitational Lenses, Periodic Variations, Pulsars, Quasars

Scientific paper

Some theorists have conjectured that strings might make a dominant contribution to the cosmological density parameter Ω. The authors show that this possibility can be ruled out unless the parameter (Gμ), a measure of the mass per unit length of cosmic strings, is below 10-14 - 10-15. Strings heavier than this would produce characteristic effects on observed quasar variability and on pulsar periods. A network of strings whose random motions were sub-relativistic would (unlike more "ordinary" material) make no contribution to the cosmic deceleration. It would, however, contribute to the global curvature, and could, if Ω were high enough, focus light through an "antipode" with an accessible redshift. Observations of gravitationally lensed quasars can thereby set an upper limit [independent of (Gμ)] to the value of Ω contributed by this kind of string network.

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