A family of rotating disks as sources of the Kerr metric

A method of constructing a family of regular rotating disks as sources of the Kerr metric is discussed. The algebraic type of the energy-momentum tensor is analyzed, and it is found that none of the disks satisfies the dominant energy condition and, in some cases, even the weak energy condition is violated. Therefore, if the constructed family includes the totality of sources for the Kerr metric with a disk-like topology, then any physically satisfactory source will not have a disk structure.     

Unter dem Titel: Chemische Pr?paratenkunde

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Thermoregulatoren, Thermostaten und Druckregulatoren

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