(Received February 16, 1962)
Assuming that the interaction between two fields takes place in the primary system, we rewrite the interaction Hamiltonian density with primary operators. Then, it becomes a well-defined operator in the primary system, and the Schrödinger equation becomes mathematically meaningful. As the proper system, that is, the physical system in the usual sense, is contained in the extension of the primary system, this Schrödinger equation has a precise mathematical meaning in the proper system, too. It is proved also that the new interaction Hamiltonian is nothing but the renormalized one of the usual interaction Hamiltonian.
URL : http://ptp.ipap.jp/link?PTP/28/80/
DOI : 10.1143/PTP.28.80