Electromagnetic Tests of Lorentz and Cpt Symmetry
نویسنده
چکیده
In recent years, there has been a growing interest in testing Lorentz and CPT symmetry. This is due to both theoretical developments as well as improved experimental capabilities. For example, it has been shown that string theory can lead to violations of CPT and Lorentz symmetry. This is because strings are nonpointlike and have nonlocal interactions. They can therefore evade the CPT theorem. In particular, there are mechanisms in string theory that can induce spontaneous breaking of Lorentz and CPT symmetry. It has also been shown that geometries with noncommutative coordinates can arise naturally in string theory and that Lorentz violation is intrinsic to noncommutative field theories. Experimental signals due to effects in these kinds of theories are expected at the Planck scale, MPl = √
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