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Killing-Yano one forms (duals of Killing vector fields) of a class ofspherically symmetric space-times characterized by four functions are derivedin a unified and exhaustive way. For well-known space-times such as those ofMinkowski, Schwarzschild, Reissner-Nordstrom, Robertson-Walker and severalforms of de Sitter, these forms arise as special cases in a natural way.Besides its two well-known forms, four more forms of de Sitter space-time arealso established with ten independent Killing vector fields for which fourdifferent time evolution regimes can explicitly be specified by the symmetryrequirement. A family of space-times in which metric characterizing functionsare of the general form and admitting six or seven independent Killing vectorfields is presented.

Killing-Yano Forms of a Class of Spherically Symmetric Space-Times I: A Unified Generation of Killing Vector Fields