Round an expanding world: A simple model to illustrate the kinematical effects of the cosmological expansion

Criado, C.; Alamo, N.

doi:doi:10.1119/1.2423041

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American Journal of Physics -- April 2007 -- Volume 75, Issue 4, pp. 331

Round an expanding world: A simple model to illustrate the kinematical effects of the cosmological expansion

C. Criado¹ and N. Alamo²

¹Departamento de Fisica Aplicada I, Universidad de Malaga, 29071 Malaga, Spain
²Departamento de Algebra, Geometria y Topologia, Universidad de Malaga, 29071 Malaga, Spain

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We use a rubber balloon model to give a simple explanation of the motion of photons and galaxies in an expanding and collapsing universe. In particular, we study the Friedmann-Lemaitre-Robertson-Walker closed universe. The behavior of the peculiar velocity of galaxies in an expanding universe is also studied with the help of this model.