Comparison of astrophysical and terrestrial frequency standards教程.pdf

REVIEW OF MODERN PHYSICS, VOLUME 83, JANUARY–MARCH 2011 Colloquium: Comparison of astrophysical and terrestrial frequency standards John G. Hartnett* and Andre N. Luiten School of Physics, University of Western Australia, Crawley, Western Australia 6009, Australia (Received 1 April 2010; published 7 January 2011) The stability of pulse arrival times from pulsars and white dwarfs have been reanalyzed using several analysis tools for measuring the noise characteristics of sampled time and frequency data. The best terrestrial artificial clocks are shown to substantially exceed the performance of astronomical sources as timekeepers in terms of accuracy (as defined by cesium primary frequency standards) and stability. This superiority in stability can be directly demonstrated over time periods up to 2 years, where there is high quality data for both. Beyond 2 years there is a deficiency of data for clock-to-clock comparisons, and both terrestrial and astronomical clocks show equal perform- ance being equally limited by the quality of the reference time scales used to make the comparisons. Nonetheless, the detailed accuracy evaluations of modern terrestrial clocks imply that these new clocks are likely to have a stability better than any astronomical source up to comparison times of at least hundreds of years. This article is intended to provide a correct appreciation of the relative merits of natural and artificial clocks. The use of natural clocks as tests of physics under the most extreme conditions is entirely appropriate; however, the contention that these natural clocks, particularly white dwarfs, can compete as timekeepers aga