The asymptotic fields in a canonically quantized gravitational field with higher derivatives are analyzed. A possible mechanism of the recovery of the physical S-matrix unitarity is discussed. The constraint ࢟µ{Bµν + (β/α)gµνB} = 0 due to the Bianchi identity on Rµν is treated by Dirac's method.
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Kawasaki et al. (1982) studied this question.
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