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Paper   IPM / Physic / 7731
School of Physics
  Title:   Massive Spinor Fields in Flat Spacetimes with Non-Trivial Topology
  Author(s): 
1.  N. Ahmadi
2.  M. Nouri-Zonoz
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  71
  Year:  2005
  Pages:   104012
  Supported by:  IPM
  Abstract:
The vacume expectation value of the stress-energy 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 R3×S1,R2×T2,R1×T3, 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 stress-energy tensor in this space and discuss its implications for the chronology protection conjecture.

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