Atomic calculations and search for variation of the fine-structure constant in quasar absorption spectra
V. A. Dzuba,Victor V. Flambaum +1 more
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Abstract:
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 analysi...read more
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Highly charged ions: Optical clocks and applications in fundamental physics
TL;DR: In this article, a review discusses how a variety of ion species and transitions may optimally be used to target new applications, and presents routes to handle them in the laboratory, as well as how to handle ion species for precision spectroscopy and accurate clocks.
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Wavelength accuracy of the keck hires spectrograph and measuring changes in the fine structure constant
Kim Griest,J. Whitmore,Arthur M. Wolfe,Arthur M. Wolfe,J. Xavier Prochaska,J. Xavier Prochaska,J. Christopher Howk,J. Christopher Howk,Geoffrey W. Marcy +8 more
TL;DR: In this article, an attempt to accurately calibrate four nights of data taken with the Keck HIRES spectrograph on QSO PHL 957, for the purpose of determining whether the fine structure constant was different in the past, was made.
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The Search for Variation of Fundamental Constants with Clocks
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A new era of fine structure constant measurements at high redshift
TL;DR: In this paper, the authors presented three important advances for infrared measurements in quasar absorption spectra from these observations, including wavelength calibration using LFC and ThAr methods, and spectral modelling using Artificial Intelligence.
Journal ArticleDOI
Accurate Prediction of Clock Transitions in a Highly Charged Ion with Complex Electronic Structure
Charles Cheung,Marianna Safronova,Marianna Safronova,S. G. Porsev,S. G. Porsev,Mikhail Kozlov,I. I. Tupitsyn,I. I. Tupitsyn,A. I. Bondarev,A. I. Bondarev +9 more
TL;DR: In this paper, a broadly applicable approach that drastically increases the ability to predict the properties of complex atoms accurately was developed for the case of Ir^{17+}, which is of particular interest for the development of novel atomic clocks with a high sensitivity to the variation of the fine-structure constant and to dark matter searches.
References
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Journal ArticleDOI
The fundamental constants and their variation: observational and theoretical status
Abstract: This article describes the various experimental bounds on the variation of the fundamental constants of nature. After a discussion of the role of fundamental constants, their definition and link with metrology, it reviews the various constraints on the variation of the fine-structure constant, the gravitational, weak- and strong-interaction couplings and the electron-to-proton mass ratio. The review aims (1) to provide the basics of each measurement, (2) to show as clearly as possible why it constrains a given constant, and (3) to point out the underlying hypotheses. Such an investigation is of importance in comparing the different results and in understanding the recent claims of the detection of a variation of the fine-structure constant and of the electron-to-proton mass ratio in quasar absorption spectra. The theoretical models leading to the prediction of such variation are also reviewed, including Kaluza-Klein theories, string theories, and other alternative theories. Cosmological implications of these results are also discussed. The links with the tests of general relativity are emphasized.
Journal ArticleDOI
Further Evidence for Cosmological Evolution of the Fine Structure Constant
John K. Webb,Michael T. Murphy,Victor V. Flambaum,V. A. Dzuba,John D. Barrow,Christopher W. Churchill,Jason X. Prochaska,Arthur M. Wolfe +7 more
TL;DR: The results of a search for time variability of the fine structure constant alpha using absorption systems in the spectra of distant quasars find no systematic effects which can explain the results.
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Search for Time Variation of the Fine Structure Constant
John K. Webb,Victor V. Flambaum,Christopher W. Churchill,Michael J. Drinkwater,John D. Barrow +4 more
TL;DR: An order of magnitude sensitivity gain is described for using quasar spectra to investigate possible time or space variation in the fine structure constant $\ensuremath{\alpha}$ and further work is required to explore possible systematic errors in the data.
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Further evidence for a variable fine‐structure constant from Keck/HIRES QSO absorption spectra
TL;DR: In this paper, a detailed many-multiplet analysis of a third Keck/HIRES sample containing 78 absorption systems was presented, providing a total of 128 absorption systems over the redshift range 0.2 < zabs < 3.7.
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Limits on the time variation of the electromagnetic fine-structure constant in the low energy limit from absorption lines in the spectra of distant quasars.
TL;DR: A detailed many-multiplet analysis performed on a new sample of Mg ii systems observed in high quality quasar spectra obtained using the Very Large Telescope finds that it is the time variation of alpha that forms the strongest constraint obtained based on high redshift quasar absorption line systems.