Abstract
As a preparation for studying quantum models, we analyze unusual features of Einstein's theory of gravitation in a three-dimensional space-time. In three dimensions, matter curves space-time only locally and the gravitational field has no dynamical degrees of freedom. The standard correspondence of Einstein's theory with Newton's theory breaks down. A dust distribution moves without any geodesic deviation between the particles. The cosmological models and relativistic stars behave in a qualitatively different way from their Newtonian counterparts. These features are important for the correct understanding of mini-superspace models.
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Giddings, S., Abbott, J. & Kuchař, K. Einstein's theory in a three-dimensional space-time. Gen Relat Gravit 16, 751–775 (1984). https://doi.org/10.1007/BF00762914
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DOI: https://doi.org/10.1007/BF00762914