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The interaction of massless minimally coupled scalar field and spinor field $\left( \Psi + \Phi_m \rightarrow \Psi + \Phi_m \right) $ is investigated andthe behavior of interaction and scattering matrix in Minkowski limit isstudied. It is seen that the massless minimally coupled scalar field operator,the interaction Lagrangian and the scattering matrix become zero. Also theincoming and outgoing spinor fields, which in de Sitter space-time aredifferent and are interacted with massless minimally coupled scalar field, innull curvature limit are the same and no interaction seen. In other word, themassless minimally coupled scalar field is dependent on curvature and can beconsidered as a part of a gravitational field.

Interaction of massless minimally coupled scalar field with spinor field in de Sitter universe