Kian Salimkhani
University of Cologne
This paper engages with the following closely related questions that have recently received some attention in the literature: what is the status of the equivalence principle in general relativity?; how does the metric field obtain its property of being able to act as a metric?; and is the metric of GR derivative on the dynamics of the matter fields? The paper attempts to complement these debates by studying the spin-2 approach to gravity. In particular, the paper argues that three lessons can be drawn from the spin-2 approach: different from what is sometimes claimed in the literature, central aspects of the non-linear theory of GR are already derivable in classical spin-2 theory; in particular, ‘universal coupling’ can be considered a derived ‘theorem’ in both the classical and the quantum spin-2 approach; this provides new insights for the investigation of the equivalence principle; the ‘second miracle’ that Read et al. argue characterises GR is explained in the classical as well as in the quantum version of the spin-2 approach; the spin-2 approach allows for an ontological reduction of the metrical part of spacetime to the dynamics of matter fields.
Keywords General Relativity  Metaphysics of Spacetime
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DOI 10.1016/j.shpsb.2020.05.002
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References found in this work BETA

Philosophy of Physics: Space and Time.Tim Maudlin - 2012 - Princeton University Press.
Physical Relativity From a Functionalist Perspective.Eleanor Knox - 2018 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 67:118-124.

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Why Not a Sound Postulate?Bryan Cheng & James Read - 2021 - Foundations of Physics 51 (3):1-20.

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