New constraints on the values of the fundamental constants at a look-back time of 7.3 Gyr

Abstract

The study of redshifted spectral lines can provide a measure of the fundamental constants over large look-back times. Current grand unified theories predict an evolution in these constants and astronomical observations offer the only experimental measure of the values of the constants over large timescales. Of particular interest are the dimensionless constants: the fine structure constant ($\alpha$), the proton-electron mass ratio ($\mu$), and the proton g-factor ($g_p$), since these do not require a "standard meterstick". Here we present a re-analysis of the 18 cm hydroxyl (OH) lines at $z=0.89$, which were recently detected with the MeerKAT telescope, toward the radio source PKS\,1830-211. Utilizing the previous constraint of $\Delta \mu /\mu =(-1.8\pm 1.2)\times 10^{-7}$, we obtain $\Delta (\alpha g_p^{0.27})/(\alpha g_p^{0.27})\lesssim 5.7\times 10^{-5}$, $\Delta \alpha /\alpha \lesssim 2.3\times 10^{-3}$ , and $\Delta g_p/g_p\lesssim 7.9\times 10^{-3}$. These new constraints are consistent with no evolution over a look-back time of 7.3 Gyr and provide another valuable data point in the putative evolution of the constants.

arXiv comment5 pages, two figures, one table, text was corrected to match the published version (A&A)

References in corpus (48)

• The String Dilaton and a Least Coupling Principle
• The fundamental constants and their variation: observational status and theoretical motivations
• Varying constants, Gravitation and Cosmology
• Further evidence for a variable fine-structure constant from Keck/HIRES QSO absorption spectra
• The Oklo bound on the time variation of the fine-structure constant revisited
• 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
• A Simple Varying-alpha Cosmology
• Molecules at z=0.89: A 4-mm-rest-frame absorption line survey toward PKS 1830-211
• Strong Limit on a Variable Proton-to-Electron Mass Ratio from Molecules in the Distant Universe
• Enhanced sensitivity to time-variation of m_p/m_e in the inversion spectrum of ammonia
• The Time Delay in the Gravitational Lens PKS 1830-211
• Constraining changes in the proton-electron mass ratio with inversion and rotational lines
• Revision of VLT/UVES constraints on a varying fine-structure constant
• Wavelength Accuracy of the Keck HIRES Spectrograph and Measuring Changes in the Fine Structure Constant
• Limits on variations in fundamental constants from 21-cm and ultraviolet quasar absorption lines
• Methods for Constraining Fine Structure Constant Evolution with OH Microwave Transitions
• Reconstructing the dark energy equation of state with varying couplings
• Constraining the variation of fundamental constants using 18cm OH lines
• Astronomical Constraints on the Cosmic Evolution of the Fine Structure Constant and Possible Quantum Dimensions
• An ALMA Early Science survey of molecular absorption lines toward PKS1830-211 -- Analysis of the absorption profiles
• Constraining fundamental constant evolution with HI and OH lines
• Constraints on changes in the proton-electron mass ratio using methanol lines
• Does the fine structure constant vary? A detailed investigation into systematic effects
• Drastic changes in the molecular absorption at redshift z=0.89 toward the quasar PKS 1830-211
• Probing variations in fundamental constants with radio and optical quasar absorption-line observations
• A Laboratory for Constraining Cosmic Evolution of the Fine Structure Constant: Conjugate 18 cm OH Lines Toward PKS 1413+135 at z=0.2467
• Illuminating the past 8 billion years of cold gas towards two gravitationally lensed quasars
• Probing the jet base of the blazar PKS1830-211 from the chromatic variability of its lensed images. Serendipitous ALMA observations of a strong gamma-ray flare
• First cosmological constraints on the proton-to-electron mass ratio from observations of rotational transitions of methanol
• Blind HI and OH absorption line search: first results with MALS and uGMRT processed using ARTIP
• Inflation in Kaluza-Klein Theory: Relation between the Fine-Structure Constant and the Cosmological Constant
• New molecular species at redshift z=0.89
• HI and OH absorption in the lensing galaxy of MG J0414+0534
• Stringent constraints on fundamental constant evolution using conjugate 18 cm satellite OH lines
• A study of submillimeter methanol absorption toward PKS1830-211: Excitation, invariance of the proton-electron mass ratio, and systematics
• The use of OH "main" lines to constrain the variation of fundamental constants
• Measuring Changes in the Fundamental Constants with Redshifted Radio Absorption Lines
• Discovery of OH absorption from a galaxy at z~0.05: implications for large surveys with SKA pathfinders
• PKS1830-211: OH and HI at z=0.89 and the first MeerKAT UHF spectrum
• Measuring space-time variation of the fundamental constants with redshifted submillimetre transitions of neutral carbon
• A pilot search for extragalactic OH absorption with FAST
• Constraining cosmologies with fundamental constants I. Quintessence and K-Essence
• The inhomogeneous ISM toward PKS1830-211 SW - A detailed view on molecular gas at a look-back time of 7.5 Gyr
• Detection of CI in absorption towards PKS 1830-211 with the eSMA
• Detection of deuterated molecules, but not of lithium hydride, in the z=0.89 absorber toward PKS1830-211
• Cosmo-tomography toward PKS1830-211: Variability of the quasar and of its foreground molecular absorption monitored with ALMA
• A new substantive proton to electron mass ratio constraint on rolling scalar field cosmologies
• On the scarcity of redshifted OH and millimetre-band molecular absorption