Phys. Rev. D 57, 3484–3488 (1998)Negative energy density states for the Dirac field in flat spacetimeReceived 17 September 1997; published in the issue dated 15 March 1998 Negative energy densities in the Dirac field produced by state vectors that are the superposition of two single particle electron states are examined. I show that for such states the energy density of the field is not bounded from below and that the quantum inequalities derived for scalar fields are satisfied. I also show that it is not possible to produce negative energy densities in a scalar field using state vectors that are arbitrary superpositions of single particle states. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.57.3484
DOI:
10.1103/PhysRevD.57.3484
PACS:
04.62.+v, 04.20.Ha
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