CSL-1: a peculiar gravitational lens and possible cosmic string

Mathematics – Logic

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Hst Proposal Id #10715 Cosmology

Scientific paper

Much recent work {see for instance Huterer & Vachaspati 2003; Kibble 2004; Polchinski 2004} has emphasized the importance that the peculiar object CSL-1 could bear on elementary particle physics and cosmology, in the case that its nature as the first observational evidence for lensing of a galaxy by a cosmic string could be confirmed. CSL-1 was discovered by the proponents who also proposed several observational tests to definitively pinpoint its nature {Sazhin et al. 2003, 2004}. With this proposal we plan to carry the most important of such tests: id est, to use the ACS/WFC to detect the sharp morphological features produced by a cosmic string and to check whether the other gravitational lens candidates, detected by the authors in the region around CSL-1 on photometric grounds only {Sazhin et al. 2004}, present similar peculiar features. Following Kibble {2004} and many others, we wish to stress that, could its link to a cosmic string be confirmed, CSL-1 will provide the first measurement ever of the energy scale of the symmetry breaking and of the energy scale of the Grand Unification Theory {GUT}, and will open a new way to investigate fundamental physics using astronomical instruments.

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