Lorentz covariance of the Yukawa₂ quantum field theory

We prove Lorentz covariance of the field algebras in the Yukawa2 quantum field theory, thus completing the verification of the Haag-Kastler axioms for this model. We also study the energy-momentum tensor of the theory. In particular, we prove an estimate of the form P(f)2 ≤const(H(g)+I)2 dominating-local momenta by local Hamiltonians. Most of the results are a consequence of this estimate. These methods apply also to the (φ4)2 model. Copyright © 1975 American Institute of Physics.