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| Paper IPM / P / 11530 |
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| Abstract: | |
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We calculate the birefringent in the vacuum for light at the leading
and sub-leading orders for the CPT-even part of the SME. We report
that all the LIV coecients absent in the leading order, but the
isotropic one, contribute to the sub-leading order birefringent.
Infrared, optical, and ultraviolet spectropolarimetry of
cosmological sources, therefore, bound these coecients to less than
10−16. This improves the best current bound on the parity-odd
coecients by two orders of magnitude. This bound establishes the
isotropy of the one-way light speed with the precision of
41[(nm)/(s)] .
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