Statistics – Computation
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211..575h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Dec. 1, 1984, p. 575-591.
Statistics
Computation
46
Cosmology, Density Distribution, Gravitational Lenses, Quasars, String Theory, Universe, Vacuum, Astronomical Models, Computational Astrophysics
Scientific paper
The possible role of a cosmological distribution of vacuum strings in the gravitational imaging of quasars is discussed. Lensing properties are described for open strings and for large and small closed loops. A simplified model shows that small loops typically produce a pair of magnified merging images. This effect introduces an observational 'amplification bias' which causes magnified quasars to appear frequently in a flux-limited sample even though they are intrinsically rare. Highly magnified merging images are sensitive to small changes in the lens, and it is shown that loop oscillations can lead to observable variations in image size, configuration, and total luminosity. Furthermore, the functional form of this variability can be derived on the basis of universal properties of Lagrangian mappings near singularities. At the time when the quasar crosses a caustic the intensity becomes formally infinite, the two images merge and then suddenly vanish as the quasar passes to the other side of the caustic. The probability of observing lensing events with various properties are estimated in two simple scenarios, and the possibility of searching for them is discussed.
Hogan Craig
Narayan Ramesh
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