2026-06-28T20:31:36Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/649252023-06-23T10:02:40Zcom_20.500.14352_14col_20.500.14352_15

Causality and the S matrix Fernández-Rañada, Antonio © 1968 The American Institute of Physics. A formalism is presented in order to impose causality conditions for finite‐range interactions which do not require the existence of wave packets with a sharp front. The absence of bound states and particle production is assumed. Two different causality conditions—referred to as strong and weak conditions—are studied. It is shown that in general the convolution kernel that connects the ingoing with the outgoing wave is not zero in the past. Some analytic properties of the S matrix are deduced. 2023-06-21T02:07:44Z 2023-06-21T02:07:44Z 1967-12 journal article 0022-2488 10.1063/1.1705160 https://hdl.handle.net/20.500.14352/64925 http://0-dx.doi.org.cisne.sim.ucm.es/10.1063/1.1705160 http://scitation.aip.org/ metadata only access American Institute of Physics