[time-nuts] Paper tip: Atomic Clocks for Geodesy

[Arnold Tibus]

Many thanks Ole,
I just read it, in fact very interesting!
regards
Arnold

Am 07.05.2019 um 12:48 schrieb Ole Petter Ronningen:
> Hi, all
>
> I just stumbled across a nice review paper from last year: (
> https://arxiv.org/ftp/arxiv/papers/1803/1803.01585.pdf) that perhaps others
> will find interesting.
>
> Primarily geared towards geodesy as the title indicates, but it also looks
> at several techniques of interest to time-nuts, such as optical clocks and
> state of the art time transfer. Also I enjoyed the reminder/example of why
> precision in timing matters..
>
> The full abstract of the paper:
>
> We review experimental progress on optical atomic clocks and frequency
> transfer, and consider the prospects of using these technologies for
> geodetic measurements. Today, optical atomic frequency standards have
> reached relative frequency inaccuracies below 10-17, opening new fields of
> fundamental and applied research. The dependence of atomic frequencies on
> the gravitational potential makes atomic clocks ideal candidates for the
> search for deviations in the predictions of Einstein's general relativity,
> tests of modern unifying theories and the development of new gravity field
> sensors. In this review, we introduce the concepts of optical atomic clocks
> and present the status of international clock development and comparison.
> Besides further improvement in stability and accuracy of today's best
> clocks, a large effort is put into increasing the reliability and
> technological readiness for applications outside of specialized
> laboratories with compact, portable devices. With relative frequency
> uncertainties of 10-18, comparisons of optical frequency standards are
> foreseen to contribute together with satellite and terrestrial data to the
> precise determination of fundamental height reference systems in geodesy
> with a resolution at the cm-level. The long-term stability of atomic
> standards will deliver excellent long-term height references for geodetic
> measurements and for the modelling and understanding of our Earth.
>
> Enjoy,
> Ole
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