In Alexander Christian, David Hommen, Nina Retzlaff & Gerhard Schurz (eds.), Philosophy of Science. European Studies in Philosophy of Science, vol 9. Cham: Springer. pp. 23-41 (2018)

Authors
Kian Salimkhani
Universität Bonn
Abstract
The quest for a theory of quantum gravity is usually understood to be driven by philosophical assumptions external to physics proper. It is suspected that specifically approaches in the context of particle physics are rather based on metaphysical premises than experimental data or physical arguments. I disagree. In this paper, I argue that the quest for a theory of quantum gravity sets an important example of physics’ internal unificatory practice. It is exactly Weinberg’s and others’ particle physics stance that reveals the issue of quantum gravity as a genuine physical problem arising within the framework of quantum field theory.
Keywords Principle of equivalence  Unification  Quantum field theory  Quantum gravity  General relativity  Graviton  spin-2  Lorentz-invariance
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