Abstract
String theory is at the moment the only advanced approach to a unification of all interactions, including gravity. But, in spite of the more than 30 years of its existence, it does not make any empirically testable predictions, and it is completely unknown which physically interpretable principles could form the basis of string theory. At the moment, “string theory” is no theory at all, but rather a labyrinthic structure of mathematical procedures and intuitions. The only motivations for string theory consist in the mutual incompatibility of the standard model of quantum field theory and of general relativity as well as in the metaphysics of the unification program of physics, aimed at a final unified theory of all interactions, including gravity. The article gives a perspective on the problems leading to and resulting from this situation
Keywords String theory  Quantum gravity
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Reprint years 2007
DOI 10.1007/s10838-007-9048-3
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References found in this work BETA

How the Laws of Physics Lie.Nancy Cartwright - 1983 - Oxford, England: Oxford University Press.
Nature's Capacities and Their Measurement.Nancy Cartwright - 1989 - Oxford, England: Oxford University Press.
Quantum Gravity.Carlo Rovelli - 2007 - Cambridge University Press.

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Citations of this work BETA

Mirror Symmetry and Other Miracles in Superstring Theory.Dean Rickles - 2013 - Foundations of Physics 43 (1):54-80.
The Role of Heuristic Appraisal in Conflicting Assessments of String Theory.Kristian Camilleri & Sophie Ritson - 2015 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 51:44-56.

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