Analysis of atomic-clock data to constrain variations of fundamental constants

Autor: Nathaniel Sherrill, Adam O Parsons, Charles F A Baynham, William Bowden, E Anne Curtis, Richard Hendricks, Ian R Hill, Richard Hobson, Helen S Margolis, Billy I Robertson, Marco Schioppo, Krzysztof Szymaniec, Alexandra Tofful, Jacob Tunesi, Rachel M Godun, Xavier Calmet

Publikováno v: New Journal of Physics, Vol 25, Iss 9, p 093012 (2023)

We present a new framework to study the time variation of fundamental constants in a model-independent way. Model independence implies more free parameters than assumed in previous studies. Using data from atomic clocks based on ^87 Sr, ^171 Yb ^+ an

Externí odkaz: https://doaj.org/article/762cc79f9af24f19bceb4487adc44d10

Building a Resilient Enhanced Time Scale Infrastructure for the UK: National Timing Centre Programme Overview

Autor: Belinda Eglin, S. L. Shemar, Peter Whibberley, Elizabeth Laier English, Ali Ashkhasi, Helen S. Margolis, Adam Parsons, Krzysztof Szymaniec, Rob Foot, Simon Ashford, Josh Whale, C. Langham, Kathryn Burrows, Richard Hendricks, Hannah Collingwood, John Davis, Leon Lobo, Andrew D. Wilson

Publikováno v: Proceedings of the 52nd Annual Precise Time and Time Interval Systems and Applications Meeting.

NPL is leading a programme called the National Timing Centre (NTC) to develop a robust, geographically distributed time scale infrastructure across the UK. The aims of the programme are to improve security and resilience in national time and frequenc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7ca76a03cfa5f522160028741442e3fc
https://doi.org/10.33012/2021.17802

A strontium optical lattice clock with $1 \times 10^{-17}$ uncertainty and measurement of its absolute frequency

Autor: C. F. A. Baynham, Alvise Vianello, William B. Bowden, Patrick Gill, Ian R. Hill, Alissa Silva, Richard Hobson, Helen S. Margolis, Patrick E. G. Baird

We present a measurement of the absolute frequency of the 5s$^2$ $^1$S$_0$ to 5s5p $^3$P$_0$ transition in $^{87}$Sr, which is a secondary representation of the SI second. We describe the optical lattice clock apparatus used for the measurement, and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7e9b11b3ccc973f84f98501c4d041ce

Geodetic methods to determine the relativistic redshift at the level of 10 $$^{-18}$$ - 18 in the context of international timescales: a review and practical results

Autor: Pacôme Delva, Christian Voigt, Peter Wolf, Gérard Petit, Stefan Weyers, Ludger Timmen, Ekkehard Peik, Heiner Denker, Helen S. Margolis

Publikováno v: Journal of Geodesy. 92:487-516

The frequency stability and uncertainty of the latest generation of optical atomic clocks is now approaching the one part in $$10^{18}$$ level. Comparisons between earthbound clocks at rest must account for the relativistic redshift of the clock freq

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f9f08f4fd286eb8a322e244e8119ed31
https://doi.org/10.1007/s00190-017-1075-1

Search for transient variations of the fine structure constant and dark matter using fiber-linked optical atomic clocks

Autor: Roman Schwarz, Olivier Lopez, R. M. Godun, J E Calvert, Dan Xu, L De Sarlo, C. Baerentsen, R. Le Targat, Ian R. Hill, Thomas Legero, Jérôme Lodewyck, Nicolas Quintin, Erik Benkler, Guy Vallet, Benjamin Roberts, S. Dörscher, Helen S. Margolis, P. Delva, Alissa Silva, Uwe Sterr, Christine C. Guo, Ch. Lisdat, C. F. A. Baynham, Ekkehard Peik, A. Al-Masoudi, Nils Huntemann, Peter Wolf, Sébastien Bize, H. Alvarez-Martinez, Christian Sanner, Aurélien Hees, T. Waterholter, William B. Bowden, Philip Tuckey, Sebastian Koke, F. Ozimek, R. Lange, Gesine Grosche, Anne Amy-Klein, V. Cambier, Etienne Cantin, F. Meynadier, Chr. Tamm, Maxime Favier, Paul-Eric Pottie, Florian Frank, S. Bilicki, A. Kuhl, J. Kronjäger, Richard Hobson, Burghard Lipphardt, Marco Schioppo, E. A. Curtis, Patrick Gill

Publikováno v: New Journal of Physics
New Journal of Physics, Institute of Physics: Open Access Journals, 2020, 22 (9), pp.093010. ⟨10.1088/1367-2630/abaace⟩
HAL

We search for transient variations of the fine structure constant using data from a European network of fiber-linked optical atomic clocks. By searching for coherent variations in the recorded clock frequency comparisons across the network, we signif

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f3a01e57b76b15f775464c101c2db556
https://hal.archives-ouvertes.fr/hal-02193937