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Quasars quadruply imaged by gravitational lenses [First-Years OK, if ...]
2020 September 7th
The physics behind gravitational lensing is simple, but it plays out in unexpected ways that are still being discovered. The introductions to these two papers by recent UROPS give some sense of the astronomical phenomena: http://www.arXiv.org/pdf/1711.07919 and http://www.arXiv.org/pdf/1808.06151 .
Mastery of div, grad and curl. Some programming experience. Additional prerequisite for first-years: linear algebra.