Key points are not available for this paper at this time.
This paper discusses a technique for detecting a cosmologically significant density of condensed objects (subluminous stars, dead clusters or galaxies, black hole : If the Universe is filled with roughly a critical density of such objects, the probability is high that a distant point source will be gravitationally imaged into two roughly equal images. This conclusion is independent of the mass M of the objects, which only sets the scale of the image doubling, 2.6 x 10-6(M/M0)112 arc seconds. Detailed statistical predictions for the relative intensity and separation of images are derived. Using optically identified QSRSs as the distant point sources, and present VLBI techniques, the mass range down to 10 M0 can be investigated directly. Indirect arguments may rule out smaller masses. Subject headings: cosmology - gravitation - quasi-stellar sources or objects - radio sources
Press et al. (Mon,) studied this question.