What are the best clocks in the Universe?

This is a question which created a controversy when Andre Luiten and I published a paper, initially, on the preprint arXiv.org, which was later published in the journal Reviews of Modern Physics, 83, 1-9, 2011. The short answer is man-made atomic clocks are.

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Where Is the Best Clock in the Universe?

Scientists vs. Pulsars

clock comp