Improved constraints on possible variation of physical constants from H I 21cm and molecular QSO absorption lines

Abstract

QSO absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of H I 21cm absorption with corresponding molecular (rotational) absorption spectra allows us to constrain variation in y=alpha^2*g_p where alpha is the fine structure constant and g_p is the proton g-factor. We analyse spectra of two QSOs, PKS 1413+135 and TXS 0218+357, and derive values of dy/y at absorption redshifts of z=0.2467 and 0.6847 by simultaneous fitting of the H I 21cm and molecular lines. We find dy/y=(-0.20 +/- 0.44)*10^{-5} and dy/y=(-0.16 +/- 0.54)*10^{-5} respectively, indicating an insignificantly smaller y in the past. We compare our results with other recent constraints from the same two QSOs (Drinkwater et al. 1998; Carilli et al. 2000) and with our recent optical constraints which indicated a smaller alpha at higher redshifts.

arXiv comment6 Pages, 3 Figures, Accepted to MNRAS, small changes after referee's comments, accepted version

References in corpus (16)

• The String Dilaton and a Least Coupling Principle
• Further Evidence for Cosmological Evolution of the Fine Structure Constant
• A Search for Time Variation of the Fine Structure Constant
• Possible evidence for a variable fine structure constant from QSO absorption lines: motivations, analysis and results
• Space-Time Variation of Physical Constants and Relativistic Corrections in Atoms
• Calculations of the Relativistic Effects in Many-Electron Atoms and Space-Time Variation of Fundamental Constants
• Astrophysical Limits on the Evolution of Dimensionless Physical Constants over Cosmological Time
• Possible evidence for a variable fine structure constant from QSO absorption lines: systematic errors
• Further constraints on variation of the fine structure constant from alkali doublet QSO absorption lines
• Redshifted Neutral Hydrogen 21cm Absorption toward Red Quasars
• New Limits on the Possible Variation of Physical Constants
• The complex molecular absorption line system at z=0.886 towards PKS1830-211
• Astronomical Constraints on the Cosmic Evolution of the Fine Structure Constant and Possible Quantum Dimensions
• Inflation in Kaluza-Klein Theory: Relation between the Fine-Structure Constant and the Cosmological Constant
• Neutral Hydrogen 21cm Absorption at Redshift 0.673 towards 1504+377
• Intrinsic intraday variability in the gravitational lens system B0218+357

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