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- W3045492007 abstract "This note provides a short guide to dimensional analysis in Lorentzian and general relativity and in differential geometry. It tries to revive Dorgelo and Schouten's notion of 'intrinsic' or 'absolute' dimension of a tensorial quantity. The intrinsic dimension is independent of the dimensions of the coordinates and expresses the physical and operational meaning of a tensor. The dimensional analysis of several important tensors and tensor operations is summarized. In particular it is shown that the components of a tensor need not have all the same dimension, and that the Riemann (once contravariant and thrice covariant), Ricci (twice covariant), and Einstein (twice covariant) curvature tensors are dimensionless. The relation between dimension and operational meaning for the metric and stress-energy-momentum tensors is discussed; and the possible conventions for the dimensions of these two tensors and of Einstein's constant $kappa$, including the curious possibility $kappa = 8pi G$ without $c$ factors, are reviewed." @default.
- W3045492007 created "2020-08-03" @default.
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- W3045492007 date "2020-01-11" @default.
- W3045492007 modified "2023-09-25" @default.
- W3045492007 title "Dimensional analysis in relativity and in differential geometry" @default.
- W3045492007 doi "https://doi.org/10.31219/osf.io/jmqnu" @default.
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