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Paper   IPM / Physic / 8101
School of Physics
  Title:   Casimir Effect in A Two Dimensional Signature Changing Spacetime
  Author(s): 
1.  F. Darabi
2.  M.R. Setare
  Status:   Published
  Journal: J. Math. Phys.
  Vol.:  47
  Year:  2006
  Pages:   032501-12
  Supported by:  IPM
  Abstract:
We study the Casimir effect for free massless scalar fields propagating on a two-dimensional cylinder with a metric that admits a change of signature from Lorentzian to Euclidean. We obtain a nonzero pressure, on the hypersurfaces of signature change, which destabilizes the signature changing region and so alters the energy spectrum of scalar fields. The modified region and spectrum, themselves, back react on the pressure. Moreover, the central term of diffeomorphism algebra of corresponding infinite conserved charges changes correspondingly.

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