Abstract
This chapter explores the role played by the Quantum Theory of Atoms in Molecules (QTAIM) in the relation between molecular chemistry and quantum mechanics, in the conceptual framework of coarse graining. It is shown that the electron density is a coarse-grained magnitude when considered from the viewpoint of quantum mechanics. As a consequence, all the concepts defined in terms of the electron density, such as those of topological atom and bond path, are also coarse-grained concepts in relation to quantum mechanics. Since coarse graining is a paradigmatic example of multiple realizability and, with this, of supervenience, the way in which the relationship between QTAIM and quantum mechanics is conceived depends on how supervenience is philosophically interpreted, and this in turn affects how the relationship between molecular chemistry and quantum mechanics is understood.
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Acknowledgments
Chérif F. Matta acknowledges the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canada Foundation for Innovation (CFI), and Mount Saint Vincent University for funding. Olimpia Lombardi acknowledges CONICET (National Council of Scientific and Technical Research) and ANPCyT (National Agency of Scientific and Technological Promotion) of Argentina.
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Lombardi, O., Matta, C.F. (2022). Coarse Graining and the Quantum Theory of Atoms in Molecules. In: Lombardi, O., MartÃnez González, J.C., Fortin, S. (eds) Philosophical Perspectives in Quantum Chemistry. Synthese Library, vol 461. Springer, Cham. https://doi.org/10.1007/978-3-030-98373-4_10
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