期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.191101
关键词
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资金
- Australian Research Council
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 data set fits a spatial dipole, significant at the 4.2 sigma level, in the direction right ascension 17.5 +/- 0.9 h, declination -58 +/- 9 deg. The independent VLT and Keck samples give consistent dipole directions and amplitudes, as do high and low redshift samples. A search for systematics, using observations duplicated at both telescopes, reveals none so far which emulate this result.
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