Testing Special Relativity and Newtonian Gravity

Lorentz invariance says that the laws of physics are the same for an observer at rest on the Earth or one who is rotated through some angle or traveling at a constant speed relative to the observer at rest. Looking for a crack in the universe in the form of a very faint field pervading the Cosmos, one that exerts a force on electron spin, would mean the end of Lorentz invariance. An important ingredient in Einstein’s theory of special relativity, Lorentz invariance has been borne out in numerous experiments. A new experiment conducted at the University of Washington, in Seattle, has sought such an anomalous field and not found it even at an energy scale of 10-21 electronvolt. This is the most stringent search yet — by a factor of 100 — for Lorentz-invariance-violating effects involving electrons.

Site – http://www.aip.org

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