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In the nonsymmetric gravitational theory (NGT) the space-time metric$g_{\mu\nu}$ departs from the flat-space Minkowski form $\eta_{\mu\nu}$ suchthat it is no longer symmetric, $i.e.$ $g_{\mu\nu} \ne g_{\nu\mu}$. We findthat in the most conservative such scenario coupled to quantum field theory,which we call Minimally Nonsymmetric Quantum Field Theory (MNQFT), there areexperimentally measurable consequences similar to those from noncommutativequantum field theory (NCQFT). This can be expected from the Seiberg-Witten mapwhich has recently been interpreted as equating gauge theories onnoncommutative spacetimes with those in a field dependent gravitationalbackground. In particular, in scattering processes such as the pairannihilation $e^+e^- \to \gamma\gamma$, both theories make the same strikingprediction that the azimuthal cross section oscillates in $\phi$. However thepredicted number of oscillations differs in the two theories: MNQFT predictsbetween one and four, whereas NCQFT has no such restriction.Comment: 15 pages, 3 figures. Expanded discussion of Seiberg-Witten map  include

Can a non-symmetric metric mimic NCQFT in $e^ + e^- \to \gamma \gamma$ ?