A Search for Time Variation of the Fine Structure Constant

Abstract

A method offering an order of magnitude sensitivity gain is described for using quasar spectra to investigate possible time or space variation in the fine structure constant, alpha. Applying the technique to a sample of 30 absorption systems, spanning redshifts 0.5 < z< 1.6, obtained with the Keck I telescope, we derive limits on variations in alpha over a wide range of epochs. For the whole sample Delta(alpha)/alpha = -1.1 +/- 0.4 x 10^{-5}. This deviation is dominated by measurements at z > 1, where Delta(alpha)/alpha = -1.9 +/- 0.5 x 10^{-5}. For z < 1, Delta(alpha)/alpha = -0.2 +/- 0.4 x 10^{-5}, consistent with other known constraints. Whilst these results are consistent with a time-varying alpha, further work is required to explore possible systematic errors in the data, although careful searches have so far not revealed any.

4 pages, 1 figure, accepted for publication in Physical Review Letters

References in corpus (2)

• Space-Time Variation of Physical Constants and Relativistic Corrections in Atoms
• New Limits on the Possible Variation of Physical Constants

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• The hypermagnetic power spectra and the phases of Sakharov oscillations
• The case for a non-expanding universe
• Black holes in the varying speed of light theory
• Invariance of the fine structure constant with temperature of the expanding universe
• Notes on the compatibility of type Ia supernovae data and varying--$G$ cosmology
• Precision laboratory UV and IR wavelengths for cosmological and astrophysical applications
• Analysing the Effect on CMB in a Parity and Charge Parity Violating Varying Alpha Theory
• A Mathematica Notebook for Alpha Decay Using an Exponentially Diffuse Boundary Potential
• Revisiting the Constancy of the Speed of Light: Galaxy Cluster Mass Bias Implications
• Very Light Cosmological Scalar Fields from a Tiny Cosmological Constant
• Dark Energy and the Time Dependence of Fundamental Particle Constants
• Non-expanding universe: a cosmological system of units