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2010

Indications of a spatial variation of the fine structure constant

Webb, J. K., King, J. A., Murphy, M. T. et al.

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We previously reported Keck telescope observations suggesting a smaller value of the fine structure constant, alpha, at high redshift.

New Very Large Telescope (VLT) data, probing a different direction in the universe, shows an inverse evolution; alpha increases at high redshift.
Although the pattern could be due to as yet undetected systematic effects, with the systematics as presently understood the combined dataset fits a spatial dipole, significant at the 4.2-sigma level, in the direction right ascension 17.5 +/- 0.9 hours, declination -58 +/- 9 degrees.
The independent VLT and Keck samples give consistent dipole directions and amplitudes, as do high and low redshift samples.

Indications of a spatial variation of the fine structure constant · Around

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V. A. Dzuba, V. V. Flambaum, and J. K. Webb, Phys. Rev. Lett. 82
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J. K. Webb et al. , Phys. Rev. Lett. 87
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M. T. Murphy, J. K. Webb, and V. V. Flambaum, Mon. Not. Roy. Astron. Soc. 345
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M. T. Murphy, V. V. Flambaum, and J. K. Webb, in Astrophysics, Clocks and Fundamental Constants , Lecture Notes in Physics (Springer, Berlin, Heidelberg, New York, 2004), Vol. 648, p. 131–150
2004
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