Abstract
The vacuum expectation value of the stress-energy tensor 〈0‖‖0〉 is calculated in several multiply connected flat spacetimes for a massive scalar field with arbitrary curvature coupling. We find that a nonzero field mass always decreases the magnitude of the energy density in chronology-respecting manifolds such as ×, ×, ×, the Möbius strip, and the Klein bottle. In Grant space, which contains nonchronal regions, whether or not 〈0‖‖0〉 diverges on a chronology horizon depends on the field mass. For a sufficiently large mass 〈0‖‖0〉 remains finite, and the metric back reaction caused by a massive quantized field may not be large enough to significantly change the Grant space geometry.
- Received 3 April 1995
DOI:https://doi.org/10.1103/PhysRevD.52.4503
©1995 American Physical Society