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- W3106367345 abstract "We report the detection of anomalous brightness fluctuations in the multiple image Q0957 + 561 A,B gravitational lens system, and consider whether such anomalies have a plausible interpretation within the framework of cosmic string theory. We study a simple model of gravitational lensing by an asymmetric rotating string. An explicit form of the lens equation is obtained and approximate relations for magnification are derived. We show that such a model with typical parameters of the GUT string can quantitatively reproduce the observed pattern of brightness fluctuations. On the other hand explanation involving a binary star system as an alternative cause requires an unacceptably large massive object at a small distance. We also discuss possible observational manifestations of cosmic strings within our lens model." @default.
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- W3106367345 date "2004-07-09" @default.
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- W3106367345 title "Anomalous fluctuations in observations of Q0957+561 A,B: Smoking gun of a cosmic string?" @default.
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- W3106367345 doi "https://doi.org/10.1051/0004-6361:20040274" @default.
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