Testing the stability of the fine structure constant using the /sup 199/Hg/sup +/ single-ion optical clock

2003 ◽  
Author(s):  
S. Bize ◽  
S.A. Diddams ◽  
U. Tanaka ◽  
C.E. Tanner ◽  
W.H. Oskay ◽  
...  
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Optical Clock ◽  
Fine Structure Constant ◽  
The Stability

scholarly journals Testing the Stability of the Fine Structure Constant in the Laboratory

2009 ◽  
Vol 148 (1-4) ◽  
pp. 267-288 ◽  
Author(s):  
N. Kolachevsky ◽  
A. Matveev ◽  
J. Alnis ◽  
C. G. Parthey ◽  
T. Steinmetz ◽  
...  
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
The Stability

scholarly journals Dark energy and equivalence principle constraints from astrophysical tests of the stability of the fine-structure constant

2015 ◽  
Vol 2015 (08) ◽  
pp. 047-047 ◽  
Author(s):  
C.J.A.P. Martins ◽  
A.M.M. Pinho ◽  
R.F.C. Alves ◽  
M. Pino ◽  
C.I.S.A. Rocha ◽  
...  
Keyword(s):  
Fine Structure ◽  
Dark Energy ◽  
Equivalence Principle ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
The Stability

scholarly journals Testing the Stability of the Fine Structure Constant in the Laboratory

2009 ◽  
pp. 319-340
Author(s):  
N. Kolachevsky ◽  
A. Matveev ◽  
J. Alnis ◽  
C. G. Parthey ◽  
T. Steinmetz ◽  
...  
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
The Stability

scholarly journals Fisher matrix forecasts for astrophysical tests of the stability of the fine-structure constant

2017 ◽  
Vol 770 ◽  
pp. 93-100 ◽  
Author(s):  
C.S. Alves ◽  
T.A. Silva ◽  
C.J.A.P. Martins ◽  
A.C.O. Leite
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Fisher Matrix ◽  
The Stability

scholarly journals New Limit on Space-Time Variations in the Proton-to-Electron Mass Ratio from Analysis of Quasar J110325-264515 Spectra

Symmetry ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 344
Author(s):  
T. D. Le
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Space Time ◽  
Fine Structure Constant ◽  
Electron Mass ◽  
Mass Ratio ◽  
Quasar Spectra ◽  
Time Variations ◽  
Using Data ◽  
The Universe

Astrophysical tests of current values for dimensionless constants known on Earth, such as the fine-structure constant, α , and proton-to-electron mass ratio, μ = m p / m e , are communicated using data from high-resolution quasar spectra in different regions or epochs of the universe. The symmetry wavelengths of [Fe II] lines from redshifted quasar spectra of J110325-264515 and their corresponding values in the laboratory were combined to find a new limit on space-time variations in the proton-to-electron mass ratio, ∆ μ / μ = ( 0.096 ± 0.182 ) × 10 − 7 . The results show how the indicated astrophysical observations can further improve the accuracy and space-time variations of physics constants.

scholarly journals Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector

2019 ◽  
Vol 218 ◽  
pp. 02012
Author(s):  
Graziano Venanzoni
Keyword(s):  
Fine Structure ◽  
Energy Region ◽  
Direct Evidence ◽  
Branching Ratio ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Recent Measurement ◽  
Single Measurement ◽  
Lepton Universality ◽  
Hadronic Contribution

I will report on the recent measurement of the fine structure constant below 1 GeV with the KLOE detector. It represents the first measurement of the running of α(s) in this energy region. Our results show a more than 5σ significance of the hadronic contribution to the running of α(s), which is the strongest direct evidence both in time-and space-like regions achieved in a single measurement. From a fit of the real part of Δα(s) and assuming the lepton universality the branching ratio BR(ω → µ+µ−) = (6.6 ± 1.4stat ± 1.7syst) · 10−5 has been determined

scholarly journals Fine structure constant and the CMB damping scale

2012 ◽  
Vol 85 (10) ◽  
Author(s):  
Eloisa Menegoni ◽  
Maria Archidiacono ◽  
Erminia Calabrese ◽  
Silvia Galli ◽  
C. J. A. P. Martins ◽  
...  
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Fine Structure Constant
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