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Attributes of Gravitational Lensing Parallax
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The density of stars and MACHOs in the universe could theoretically be determined or limited by simultaneous measurements of compact sources by well separated observers. A gravitational lens effect would be expected to create a slight differential amplification between the observers detectable with sufficiently sensitive relative photometry: "lensing parallax." When applied to expanding fireballs such as those from GRBs and supernovae, the mass of the lens can be indicated by the end of lensing parallax, when the angular size of the source becomes much greater than the angular size of the Einstein ring of the lens.
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Cited by 1 Pith paper
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Picolensing as a Probe of Primordial Black Hole Dark Matter
Asteroid-mass primordial black hole dark matter could be probed by picolensing of gamma-ray bursts, but only with detector separations of at least Earth-L2 distance once realistic GRB size uncertainties are included.
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