RT Journal Article T1 Relativistic quantum mechanics of hydrogen atom as weak-field limit of a nonlinear theory A1 Fernández-Rañada, Antonio AB The effect of nonlinear terms in the Dirac equation is investigated, in the case of the hydrogen atom. It is found that the change in the energy is of order α6 for a very large range of values of the coupling constant of the dominant term. It is shown that a nonlinear classical field theory has a quantumlike behavior near the linear limit. This implies the existence of a close relation between linearization and quantization. A classical stable model of the hydrogen atom is presented. Some consequences are discussed. PB Plenum SN 0020-7748 YR 1977 FD 1977-11-01 LK https://hdl.handle.net/20.500.14352/64911 UL https://hdl.handle.net/20.500.14352/64911 DS Docta Complutense RD 22 abr 2025