Variational Monte Carlo calculations of 3H and 4He with a relativistic Hamiltonian.

In relativistic Hamiltonians the two-nucleon interaction is expressed as a sum of {tilde v}{sub ij}, the interaction in the P{sub ij}=0 rest frame, and the ''boost interaction'' {delta}v(P{sub ij}) which depends upon the total momentum P{sub ij} and vanishes in the rest frame. The {delta}v can be regarded as a sum of four terms: {delta}v{sub RE}, {delta}v{sub LC}, {delta}v{sub TP} and {delta}v{sub QM}; the first three originate from the relativistic energy-momentum relation, Lorentz contraction and Thomas precession, while the last is purely quantum. The contributions of {delta}v{sub RE} and {delta}v{sub LC} have been previously calculated with the variational Monte Carlo method for {sup 3}H and {sup 4}He. In this brief note we report the results of similar calculations for the contributions of {delta}v{sub TP} and {delta}v{sub QM}. These are found to be rather small.