Saunders, Simon
(1991)
The Negative Energy Sea.
Philosophy of Vacuum.
pp. 65-109.
ISSN 9780198244493
Abstract
The Dirac negative energy sea introduced the concept of antimatter, and explained it, not least in its relationship to negative-energy solutions to the wave equation. Post-war, it was largely displaced by what I shall call the 'standard formalism', dependent, among other things, on normal-ordering. A much better explanation is provided by the 'two complex structures' viewpoint, as first introduced by Irving Segal: the one ('natural') kind of complex numbers at the level of covariant, local fields; and the other ('particle') at the level of the one-particle Hilbert space and Fock space. The former is local, the latter non-local: therein lies the fundamental difference between relativistic and non-relativistic quantum theory.
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