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- W2956066878 abstract "We have re-analyzed the stability of pulse arrival times from pulsars andwhite dwarfs using several analysis tools for measuring the noisecharacteristics of sampled time and frequency data. We show that the bestterrestrial artificial clocks substantially exceed the performance ofastronomical sources as time-keepers in terms of accuracy (as defined by cesiumprimary frequency standards) and stability. The superiority in stability isdemonstrated over timescales up to 2 years. Beyond 2 years there is adeficiency of data for clock/clock comparisons and both terrestrial andastronomical clocks are equally limited by the quality of the timedissemination systems used to make the comparisons. Nonetheless, we show thatdetailed accuracy evaluations of modern terrestrial clocks imply that theseclocks are likely to have a stability better than any astronomical source up totimescales of at least hundreds of years. This is in conflict with many claimsin the literature and so we believe it is crucial to rectify thismisunderstanding so that there may be a correct appreciation of the relativemerits of natural and artificial clocks. The use of natural clocks as tests ofphysics under the most extreme conditions is entirely appropriate; however, thecontention that these natural clocks, particularly white dwarfs, can compete astimekeepers against devices constructed by mankind is shown to be doubtful." @default.
- W2956066878 created "2019-07-12" @default.
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- W2956066878 date "2010-04-01" @default.
- W2956066878 modified "2023-09-26" @default.
- W2956066878 title "A Comparison of Astrophysical and Terrestrial Frequency Standards: Which are the best clocks?" @default.
- W2956066878 hasPublicationYear "2010" @default.
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