Already in 1914 – before Einstein had fulfilled the construction of the general theory of relativity – Gunnar Nordström1 had published a five-dimensional scalar-tensor theory of gravitation in an effort to unify gravitation and electromagnetism. Since it was based upon his own theory of gravitation which was soon surpassed by Einstein’s theory, this work was neglected for several decades.


Extra Dimension Hyperbolic Space Conformal Transformation Ricci Tensor Killing Vector 
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© Springer Science+Business Media, LLC 2007

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