Variation of fundamental constants and white dwarfs

@article{Landau2019VariationOF,
  title={Variation of fundamental constants and white dwarfs},
  author={Susana J. Landau},
  journal={Proceedings of the International Astronomical Union},
  year={2019},
  volume={15},
  pages={45 - 59}
}
  • S. Landau
  • Published 1 October 2019
  • Physics
  • Proceedings of the International Astronomical Union
Abstract Theories that attempt to unify the four fundamental interactions and alternative theories of gravity predict time and/or spatial variation of the fundamental constants of nature. Different versions of these theories predict different behaviours for these variations. As a consequence, experimental and observational bounds are an important tool to check the validity of such proposals. In this paper, we review constraints on the possible variation of the fundamental constants from… 
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References

SHOWING 1-10 OF 67 REFERENCES
Current and future white dwarf mass-radius constraints on varying fundamental couplings and unification scenarios
We discuss the feasibility of using astrophysical observations of white dwarfs as probes of fundamental physics. We quantify the effects of varying fundamental couplings on the white dwarf…
The status of varying constants: a review of the physics, searches and implications.
  • C. Martins
  • Physics
    Reports on progress in physics. Physical Society
  • 2017
TLDR
Recent developments in tests of the stability of nature's fundamental couplings provide a direct handle on new physics: a detection of variations will be revolutionary, but even improved null results provide competitive constraints on a range of cosmological and particle physics paradigms.
Constraint on a varying proton-electron mass ratio 1.5 billion years after the big bang.
TLDR
A molecular hydrogen absorber at a lookback time of 12.4 billion years, corresponding to 10% of the age of the Universe today, is analyzed to put a constraint on a varying proton-electron mass ratio, μ, yielding a limit on the relative deviation from the current laboratory value.
Constraint on a varying proton-to-electron mass ratio from molecular hydrogen absorption towards quasar SDSS J123714.60+064759.5
Molecular hydrogen transitions in the sub-damped Lyman alpha absorber at redshift z = 2.69, toward the background quasar SDSS J123714.60+064759.5, were analyzed in order to search for a possible…
Reappraisal of the limit on the variation inimplied by Oklo
Methods: We point out that, with more appropriate choices of nuclear parameters, the standard estimate (due to Damour and Dyson) of the sensitivity for resonances in 150 Sm is increased by a factor…
Frequency ratio of two optical clock transitions in 171Yb+ and constraints on the time variation of fundamental constants.
TLDR
This work presents the first direct measurement of the frequency ratio of these two clock transitions, without reference to a cesium primary standard, and using the same single ion of 171Yb+.
Limits on a gravitational field dependence of the proton-electron mass ratio from H2 in white dwarf stars.
TLDR
The Lyman transitions of H2, observed with the Hubble Space Telescope towards white dwarf stars that underwent a gravitational collapse, are compared to accurate laboratory spectra taking into account the high temperature conditions of their photospheres.
Limits on the dependence of the fine-structure constant on gravitational potential from white-dwarf spectra.
TLDR
Comparison of laboratory spectra with far-UV astronomical spectra from the white-dwarf star G191-B2B recorded by the Hubble Space Telescope Imaging Spectrograph gives limits of Δα/α=(4.2±1.6)×10(-5) from FeV and NiV spectra, respectively, at a dimensionless gravitational potential relative to Earth of Δφ≈5×10−5.
Robust constraint on a drifting proton-to-electron mass ratio at z=0.89 from methanol observation at three radio telescopes.
A limit on a possible cosmological variation of the proton-to-electron mass ratio μ is derived from methanol (CH3OH) absorption lines in the benchmark PKS1830-211 lensing galaxy at redshift z=0.89…
The UVES large program for testing fundamental physics-II. Constraints on a change in μ towards quasar HE 0027-1836
We present an accurate analysis of the H-2 absorption lines from the z(abs) similar to 2.4018 damped Ly alpha system towards HE 0027-1836 observed with the Very Large Telescope Ultraviolet and Visual…
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