Uhrengang und Energiesatz in der Kosmolo
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Hans-Jรผrgen Treder
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Article
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1970
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John Wiley and Sons
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English
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No time-like KrurNa-vector but only a conformal time-like KILLING-vector is existing in cosmological space-time. Therefore, the validity of a law of conservation of energy is depending on the equations of state and on the choice of clocks.