Abstract
The paper is concerned with the derivability of a Lorentz instead of only a Weyl manifold as space-time structure from postulates about free fall and light propagation. For this purpose it identifies a property distinguishing both kinds of space-times. The property is one of a particular metric of the conformal class of the Weyl manifold. viz. that in suitably chosen locally geodesic coordinates theg i4 components,i=1, 2, 3 vanish along the time axis. Although seemingly somewhat hidden, one is led to this property in looking for a metric which can play a distinguished role. We demonstrate that for a Lorentzian manifold such a condition is always given; thus it is a necessary one. It is sufficient since for a Weyl space it has the consequence that the metric connection of the selectedg is projectively equivalent to the Weyl connection. Thus, if a Weyl space-time complies with it, it is a reducible one. The results of this paper lay the ground for deriving in a second step this condition from a simple, empirically testable postulate about free-fall worldlines and “radar” measurements by light signals.
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References
Ehlers, J., Pirani, F. A. E., and Schild, A. (1973). The geometry of free fall and light propagation, inGeneral Relativity: Papers in Honour of J. L. Synge, L. O'Raifeartaigh, ed., Clarendon Press, Oxford, pp. 63–84.
Meister, R. (1994). A structural analysis of the EPS space-time theory, revised English translation of Diploma thesis, University of Paderborn.
O'Neill, B. (1983).Semi-Riemannian Geometry, Academic Press, New York.
Reichenbach, H. (1969).Axiomatization of the Theory of Relativity, University of California Press, Los Angeles (original German edition, 1924).
Sachs, R. K., and Wu, H. (1977).General Relativity for Mathematicians, Springer, New York.
Schelb, U. (1992). An axiomatic basis of space-time theory. Part III,Reports on Mathematical Physics,31, 297.
Schelb, U. (1996). Establishment of the Riemannian structure of space-time by classical means,International Journal of Theoretical Physics,35, 1767–1788.
Schroeter, J. (1988). An axiomatic basis of space-time theory. Part I,Reports on Mathematical Physics,26, 303.
Schroeter, J., and Schelb, U. (1992). An axiomatic basis of space-time theory. Part II,Reports on Mathematical Physics,31, 5.
Schroeter, J., and Schelb, U. (1993). On the relation between space-time theory and general relativity, Preprint 18/1993, Center for Interdisciplinary Research (ZIF), University of Bielefeld, Germany.
Weyl, H. (1921). Zur Infinitesimalgeometrie: Einordnung der projektiven und konformen Auffassung,Nachrichten von der Koenigl Gesellschaft der Wissenschaften zu Göttingen. Mathematisch-Physikalische Klasse,1921, 99–112.
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Schelb, U. On a new condition distinguishing Weyl and Lorentz space-times. Int J Theor Phys 36, 1341–1358 (1997). https://doi.org/10.1007/BF02435928
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DOI: https://doi.org/10.1007/BF02435928