CONSTRAINTS ON SPATIAL VARIATIONS IN THE FINE-STRUCTURE CONSTANT FROMPLANCK

2014 ◽  
Vol 798 (1) ◽  
pp. 18 ◽  
Author(s):  
Jon O'Bryan ◽  
Joseph Smidt ◽  
Francesco De Bernardis ◽  
Asantha Cooray
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Spatial Variations ◽  
Fine Structure Constant

scholarly journals Spatial variations of the fine-structure constant in symmetron models

2014 ◽  
Vol 89 (2) ◽  
Author(s):  
Marvin F. Silva ◽  
Hans A. Winther ◽  
David F. Mota ◽  
C. J. A. P. Martins
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Spatial Variations ◽  
Fine Structure Constant

scholarly journals New Constraints on Spatial Variations of the Fine Structure Constant from Clusters of Galaxies

Universe ◽  
2016 ◽  
Vol 2 (4) ◽  
pp. 34 ◽  
Author(s):  
Ivan De Martino ◽  
Carlos Martins ◽  
Harald Ebeling ◽  
Dale Kocevski
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Spatial Variations ◽  
Fine Structure Constant ◽  
Clusters Of Galaxies

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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