Symmetry, Volume 14, Issue 10
2022 October - 270 articles
Cover Story: If it were possible to define and evaluate Euclidean functional integrals for gravity by considering only finite-perimeter sets in the sum over histories, one might exploit the concepts and tools of geometric measure theory. This paper prepares the ground for such a program, by studying the concept of generalized normal in non-Euclidean spaces. In the hyperbolic plane, we define an n-sided hyperbolic polygon. The polygon is built by considering the unique geodesic that connects the n+2 vertices. The geodesics which link the vertices are Euclidean semicircles centred on the real axis. The vector normal to the geodesic linking two consecutive vertices is evaluated and turns out to be discontinuous. View this paper - Issues are regarded as officially published after their release is announced to the table of contents alert mailing list .
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