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Paper IPM / P / 7731  


Abstract:  
The vacume expectation value of the stressenergy tensor is
calculated for spin [1/2] massive fields in several
multiply connected flat spacetimes. We examine the physical
effects of topology on manifolds such as R^{3}×S^{1},R^{2}×T^{2},R^{1}×T^{3}, the mobius strip and the
Klein bottle. We find that the soinor vacuum stress tensor has the
opposite sign to, and twice the magnitude of, the scalar tensor in
orientable maifolds. Extending the above considerations to the
case of Minser spacetime, we calculate the vacuum expectation
value of spinor stressenergy tensor in this space and discuss its
implications for the chronology protection conjecture.
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