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math-ph2014★ 2 cited
An analytical approach to the external force-free motion of pendulums on surfaces of constant curvature
Rafael M. Rubio, Juan Jesús Salamanca
The dynamics of force free motion of pendulums on surfaces of constant Gaussian curvature is addressed when the pivot moves along a geodesic obtaining the Lagragian of the system.…
math-ph2014
Complete constant mean curvature spacelike hypersurfaces in the Einstein-de Sitter spacetime
Rafael M. Rubio
Uniqueness and non-existence results on complete constant mean curvature spacelike hypersurfaces lying between two spacelike slice in the Einstein-de Sitter spacetime are given. Th…