Perspective: Tipping the scales - search for drifting constants from molecular spectra

Abstract

Transitions in atoms and molecules provide an ideal test ground for constraining or detecting a possible variation of the fundamental constants of nature. In this Perspective, we review molecular species that are of specific interest in the search for a drifting proton-to-electron mass ratio $\mu$. In particular, we outline the procedures that are used to calculate the sensitivity coefficients for transitions in these molecules and discuss current searches. These methods have led to a rate of change in $\mu$ bounded to $6\times 10^{-14}$/yr from a laboratory experiment performed in the present epoch. On a cosmological time scale the variation is limited to $|\Delta \mu /\mu |<10^{-5}$ for look-back times of 10-12 billion years and to $|\Delta \mu /\mu |<10^{-7}$ for look-back times of 7 billion years. The last result, obtained from high-redshift observation of methanol, translates into $\dot{\mu }/\mu =(1.4\pm 1.4)\times 10^{-17}$/yr if a linear rate of change is assumed.

Accepted Journal of Chemical Physics, 14 Pages, 10 figures

References in corpus (14)

• Precision Test of Mass Ratio Variations with Lattice-Confined Ultracold Molecules
• Spatial variation in the fine-structure constant -- new results from VLT/UVES
• Enhanced sensitivity to variation of the fine structure constant and m_p/m_e in diatomic molecules
• Stability of the proton-to-electron mass ratio
• Enhanced sensitivity to variation of $m_e/m_p$ in molecular spectra
• 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
• Robust Constraint on a Drifting Proton-to-Electron Mass Ratio at z=0.89 from Methanol Observation at Three Radio Telescopes
• First constraint on cosmological variation of the proton-to-electron mass ratio from two independent telescopes
• The CO A-X System for Constraining Cosmological Drift of the Proton-Electron Mass Ratio
• $\Lambda$-doublet spectra of diatomic radicals and their dependence on fundamental constants
• Sensitivity of the H3O+ inversion-rotational spectrum to changes in m_e/m_p
• Linear polyatomic molecules with Π ground state: sensitivity to variation of the fundamental constants
• Sensitivity of the isotopologues of hydronium to variation of the electron-to-proton mass ratio

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