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Open AccessArticle

The Standard-Model Extension and Gravitational Tests

Department of Physics and Astronomy, Carleton College, One North College St., Northfield, MN 55057, USA
Academic Editor: Eberhard Widmann
Symmetry 2016, 8(11), 111;
Received: 1 September 2016 / Revised: 29 September 2016 / Accepted: 8 October 2016 / Published: 27 October 2016
(This article belongs to the Special Issue CPT Symmetry)
The Standard-Model Extension (SME) provides a comprehensive effective field-theory framework for the study of CPT and Lorentz symmetry. This work reviews the structure and philosophy of the SME and provides some intuitive examples of symmetry violation. The results of recent gravitational tests performed within the SME are summarized including analysis of results from the Laser Interferometer Gravitational-Wave Observatory (LIGO), sensitivities achieved in short-range gravity experiments, constraints from cosmic-ray data, and results achieved by studying planetary ephemerids. Some proposals and ongoing efforts will also be considered including gravimeter tests, tests of the Weak Equivalence Principle, and antimatter experiments. Our review of the above topics is augmented by several original extensions of the relevant work. We present new examples of symmetry violation in the SME and use the cosmic-ray analysis to place first-ever constraints on 81 additional operators. View Full-Text
Keywords: gravity; Lorentz symmetry; CPT symmetry gravity; Lorentz symmetry; CPT symmetry
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Tasson, J.D. The Standard-Model Extension and Gravitational Tests. Symmetry 2016, 8, 111.

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