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Perspectives in geometry and relativity

Bloomington,: Indiana University Press. Edited by Václav Hlavatý (1966)

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  1. Background Independence, Diffeomorphism Invariance, and the Meaning of Coordinates.Oliver Pooley - 2016 - In Dennis Lehmkuhl, Gregor Schiemann & Erhard Scholz (eds.), Towards a Theory of Spacetime Theories. New York, NY: Birkhauser.
    Diffeomorphism invariance is sometimes taken to be a criterion of background independence. This claim is commonly accompanied by a second, that the genuine physical magnitudes (the ``observables'') of background-independent theories and those of background-dependent (non-diffeomorphism-invariant) theories are essentially different in nature. I argue against both claims. Background-dependent theories can be formulated in a diffeomorphism-invariant manner. This suggests that the nature of the physical magnitudes of relevantly analogous theories (one background free, the other background dependent) is essentially the same. The temptation (...)
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  • Noncollinearity of velocity and momentum of spinning particles.Olivier Costa de Beauregard - 1972 - Foundations of Physics 2 (2-3):111-127.
    A theoretical and experimental search for the so-called Weyssenhof behavior of a spinning particle, due to the noncollinearity of its velocity and momentum, has been undertaken. Z-independent solutions of Maxwell's equations had previously been produced with a nonzeros z component of the Poynting vector; indeed, Imbert emphasized that the spatial exponential damping of Fresnel's evanescent wave would entail a nonzero value for the integral ε εs z dx dy. Excellent experimental verifications of this point have been obtained by Imbert. Besides (...)
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