| Zugriffsnummer | 17673 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | New limit on the present temporal variation of the fine structure constant |
| Autor(in); Institution |
Peik, Ekkehard; 4.4, Zeit und Frequenz, PTB-Braunschweig
Lipphardt, Burghard; 4.4, Zeit und Frequenz, PTB-Braunschweig
Schnatz, Harald; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Schneider, Tobias; 4.4, Zeit und Frequenz, PTB-Braunschweig
Tamm, Christian; 4.4, Zeit und Frequenz, PTB-Braunschweig
Karshenboim, Savely G.; Max-Planck-Institut für Quantenoptik, Garching, GERMANY
|
| Quelle/Jahr | Atomic physics 19 : XIX International Conference on Atomic Physics:(2005), 103 - 111 |
| Schriftenreihe | AIP conference proceedings: 770 |
| Herausgeber(in) |
Marcassa, Luis Gustavo
|
| ISBN | 0-7354-0255-8 |
| Verlag | Melville, NY: AIP |
| Konferenzangaben | XIX International Conference on Atomic Physics, Rio de Janeiro, 25-30, July, 2004, Brazil |
| Freie Schlagworte | fine structure ; constants ; frequency standards |
| Zusammenfassung | A comparison of different atomic frequency standards over time can be used to perform a measurement of the present value of the temporal derivative of the fine structure constant α in a model-independent way without assumptions on constancy or variability of other parameters. We have measured an optical transition frequency at 688 THz in Yb+ with a cesium atomic clock at two times separated by 2.8 years and find that a variation of this frequency can be excluded within a1σ relative uncertainty of 4.4 · 10-15yr-1. Combined with recently published values for the constancy of other transition frequencies this measurement provides a limit on the present variability of α at the level of 2.10 · 10-15yr-1. Constraints are also derived for the drift rates of other fundamental constants like the electron/proton mass ratio and the proton g-factor. |
