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A kinematic method to obtain conformal factors
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A kinematic method to obtain conformal factors
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| Herrero Debón, Alicia; Morales Lladosa, Juan Antonio | |||
| Aquest document és un/a article, creat/da en: 2000 | |||
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| Radial conformal motions are considered in conformally flat space-times and their properties are used to obtain conformal factors. The geodesic case leads directly to the conformal factor of Robertson-Walker universes. General cases admitting homogeneous expansion or orthogonal hypersurfaces of constant curvature are analyzed separately. When the two conditions above are considered together a subfamily of the Stephani perfect fluid solutions, with acceleration Fermi-Walker propagated along the flow of the fluid, follows. The corresponding conformal factors are calculated and contrasted with those associated with Robertson-Walker space-times. | |||
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