Dimensionally Challenged Gravities

Abstract

I review some ways in which spacetime dimensionality enters explicitly in gravitation. In particular, I recall some unusual geometrical gravity models that are constructible in dimensions different from four, especially in D=3 where even ordinary Einstein theory is "different", e.g., fully Machian.

4 pages, Contribution to J. Stachel Festschrift, to be published in "Boston Studies in the Philosophy of Science"; Revisiting the foundations of relativistic physics (Kluwer 2003)

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