scholarly journals An Updated Constraint on Variations of the Fine-Structure Constant Using Wavelengths of Fe II Absorption Line Multiplets

Symmetry ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 722 ◽  
Author(s):  
T. D. Le
Keyword(s):  
Fine Structure ◽  
Absorption Line ◽  
Absorption Spectra ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
The Future ◽  
Stringent Limit

A new stringent limit relating to the variation of the fine-structure constant (α= e2/4πε0ℏc) has been extracted from Ritz wavelengths of 27 quasi_stellar object (QSO) absorption spectra lines of Fe II. The calculation was combined with laboratory wavelengths and QSO spectra to obtain the result ∆α/α=(0.027±0.832)×10-6. This result suggests how dedicated astrophysical estimations can improve these limits in the future and can also constrain space_time variations.

scholarly journals Search for variation of the fundamental constants in atomic, molecular, and nuclear spectra

2009 ◽  
Vol 87 (1) ◽  
pp. 25-33 ◽  
Author(s):  
V V Flambaum ◽  
V A Dzuba
Keyword(s):  
Fine Structure ◽  
Absorption Spectra ◽  
Atomic Clock ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Frequency Change ◽  
Fundamental Constants ◽  
Mass Ratio ◽  
Proton Mass ◽  
Nuclear Transitions

The search for variation of the fundamental constants such as the fine-structure constant α (α = e2/hc) and the ratios of fundamental masses (for example, electron-to-proton mass ratio μ = me/mp) is reviewed. Strong emphasis is given to establishing the relationships between the change in the measured frequencies of atomic, molecular, or nuclear transitions and the corresponding change of the fundamental constants. Transitions in which the sensitivity of the frequency change to the variation of the fine-structure constant is strongly enhanced are discussed and most recent experimental results are presented. Most attention is given to the use of atomic, molecular, and nuclear transitions in the study of quasar absorption spectra and in atomic clock experiments.PACS Nos.: 31.25.Eb, 31.25.Jf

scholarly journals Atomic calculations and search for variation of the fine-structure constant in quasar absorption spectra

2009 ◽  
Vol 87 (1) ◽  
pp. 15-23 ◽  
Author(s):  
V A Dzuba ◽  
V V Flambaum
Keyword(s):  
Fine Structure ◽  
Absorption Spectra ◽  
Periodic Table ◽  
Structure Constant ◽  
Electron Structure ◽  
Special Consideration ◽  
Fine Structure Constant ◽  
Critical Compilation

A brief review of the search for variation of the fine-structure constant in quasar absorption spectra is presented. Special consideration is given to the role of atomic calculations in the analysis of the observed data. A range of methods that allows us to perform calculations for atoms or ions with different electron structure and which cover practically all the Periodic Table of elements is discussed. Critical compilation of the results of the calculations as well as a review of the most recent results of the analysis are presented.PACS Nos.: 31.25.Eb, 31.25.Jf

Searching for places where to test the variations of fundamental constants

2009 ◽  
Vol 5 (H15) ◽  
pp. 317-317
Author(s):  
P. Petitjean ◽  
P. Noterdaeme ◽  
R. Srianand ◽  
C. Ledoux ◽  
A. Ivanchik ◽  
...  
Keyword(s):  
Fine Structure ◽  
Absorption Line ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Electron Mass ◽  
Fundamental Constants ◽  
Mass Ratio ◽  
Time Variations

AbstractIt has been realised in the last few years that strong constraints on the time-variations of dimensionless fundamental constants of physics can be derived at any redshift from QSO absorption line systems. Variations of the fine structure constant, α, the proton-to-electron mass ratio, μ, or the combination, x=α2gp/μ, where gp is the proton gyromagnetic factor, have been constrained. However, for the latter two constants, the number of lines of sight where these measurements can be performed is limited. In particular the number of known molecular and 21 cm absorbers is small. Our group has started several surveys to search for these systems. Here is a summary of some of the characteristics of these absorbers that can be used to find these systems.

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.

Sign in / Sign up

Export Citation Format

Share Document