Noncommutative Dipole Field Theories And Unitarity
arXiv:hep-th/0310233 · doi:10.1088/1126-6708/2004/03/050
Abstract
We extend the argument of Gomis and Mehen for violation of unitarity in field theories with space-time noncommutativity to dipole field theories. In dipole field theories with a timelike dipole vector, we present 1-loop amplitudes that violate the optical theorem. A quantum mechanical system with nonlocal potential of finite extent in time also shows violation of unitarity.
typos corrected, more details added in Sec 5, version to appear in JHEP
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