Abstract
Two popular approaches towards a quantum theory of gravity are quantum general relativity and string theory (‘M-theory’). I review their essential ideas with special emphasis on the role of fundamental constants. A special section is devoted to Kaluza–Klein theories. Most of the ‘constants’ may have their origin in quantum fields of the fundamental theory and may be space- and time-dependent in their classical limit.
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Kiefer, C. (2004). Quantum Gravity and Fundamental Constants. In: Karshenboim, S.G., Peik, E. (eds) Astrophysics, Clocks and Fundamental Constants. Lecture Notes in Physics, vol 648. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-40991-5_8
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DOI: https://doi.org/10.1007/978-3-540-40991-5_8
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