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Superluminal, advanced and retarded propagation of electromagnetic potentials in quantum mechanics

โœ Scribed by Kuo-Ho Yang; Donald H Kobe

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
838 KB
Volume
168
Category
Article
ISSN
0003-4916

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โœฆ Synopsis

In some gauges part of the classical electromagnetic potentials can propagate faster than the speed of light. In other gauges part of the electromagnetic potentials can be advanced, even though the electromagnetic field is retarded. If the conventional interaction between electromagnetic radiation and quantum mechanical charged particles, which involves the vector and scalar potentials, is used, an atom has a nonzero probability of being excited before the electromagnetic Seld arrives. If part of the potentials are advanced, the atom could even be excited before the sources are turned on. These spurious effects, which are gauge dependent and violate energy conservation, relativity, and causality, are due to use the conventional (gauge-dependent) interaction. When the interaction of the electromagnetic radiation and matter is treated in a manifestly gauge-invariant way, the atom is not excited before the electromagnetic field arrives, regardless of which gauge is used. 1" 1986 Academic Press. Inc

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