Covariant change of signature in classical relativity |
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Authors: | G. F. R. Ellis |
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Affiliation: | (1) S.I.S.S.A., Strada Costiera 11, I-34014 Trieste, Italy;(2) Department of Applied Mathematics, University of Cape Town, South Africa |
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Abstract: | This paper gives a covariant formalism enabling investigation of the possibility of change of signature in classical General Relativity, when the geometry is that of a Robertson-Walker universe. It is shown that such changes are compatible with the Einstein field equations, both in the case of a barotropic fluid and of a scalar field. A criterion is given for when such a change of signature should take place in the scalar field case. Some examples show the kind of resulting exact solutions of the field equations. |
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