73 pages! On Tue, 7 May 2019 at 9:38 pm, Ole Petter Ronningen <[email protected]> wrote:
> 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 > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
