‘But one must not legalize the mentioned sin’: Phenomenological vs. dynamical treatments of rods and clocks in Einstein׳s thought

Citation data:

Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics, ISSN: 1355-2198, Vol: 48, Issue: PA, Page: 20-44

Publication Year:
2014
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Repository URL:
http://philsci-archive.pitt.edu/id/eprint/11821
DOI:
10.1016/j.shpsb.2014.08.012
Author(s):
Giovanelli, Marco
Publisher(s):
Elsevier BV, Elsevier
Tags:
Arts and Humanities, Physics and Astronomy
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article description
This paper offers a historical overview of Einstein׳s vacillating attitude towards ‘phenomenological’ and ‘dynamical’ treatments of rods and clocks in relativity theory. In Einstein׳s view, a realistic microscopic model of rods and clocks was needed to account for the very existence of measuring devices of identical construction that always measure the same unit of time and the same unit of length. It will be shown that the empirical meaningfulness of both relativity theories depends on what, following Max Born, one might call the ‘principle of the physical identity of the units of measure’. In an attempt to justify the validity of such a principle, Einstein was forced by different interlocutors, in particular Hermann Weyl and Wolfgang Pauli, to deal with the genuine epistemological, rather than the physical question of whether a theory should be required to describe the material devices needed for its own verification.

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