Rotating Relativistic Thin Disks as Sources of the Taub-NUT Solution

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González, Guillermo A.
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Universidad Industrial de Santander
Abstract
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Rotating disks with nonzero radial pressure and finite radius are studied. The models are based in the Taub-NUT metric and cons-tructed using the well-known "displace, cut and reflect" method. We find that the disks are made of perfect fluids with constant energy density and pressure. The energy density is negative, but the effective Newto-nian density is possitive as the strong energy condition requires. We also find that the disks are not stable under radial perturbations and that there are regions of the disks where the particles move with superluminal velocities.   
Keywords
Taub-NUT metric, Newotnian density, general relativity
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