Abstract
The issue of the form that the microscopic constitutive relation between electromagnetic inductions and fields should take in a dynamic spacetime is examined, and an answer that can be provided through the geometric objects of Einstein's unified field theory is considered. It is shown that the microscopic constitutive relation implied by these geometric objects allows to produce dynamically, by availing of fluctuations of the metric field with an appropriate behaviour, both the macroscopic relation between weak inductions and fields prevailing in vacuo and the one that occurs in nondispersive, nonconducting material media. The possible relevance of these results for a theory of matter in a dynamic spacetime that does not rely on the quantum framework is intimated, and conceptual reasons why it may be worth exploring such an alternative are outlined.
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