Null geodesics, caustics and apparent motion of galaxies in a finite rotating universe

Details Null geodesics, caustics and apparent motion of galaxies in a finite rotating universe Null geodesics, caustics and apparent motion of galaxies in a finite rotating universe

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gregr..16..161s&link_type=abstract

General Relativity and Gravitation (ISSN 0001-7701), vol. 16, Feb. 1984, p. 161-173.

Physics

1

Caustic Lines, Galactic Rotation, Geodesic Lines, Rotating Matter, Universe, Cosmology, Einstein Equations, Relativity, Space-Time Functions

Scientific paper

Null solutions of the geodesic equation are presented for a universe which can be regarded as a rotating and shearing generalization of the static Einstein universe. It is shown how the closest caustic, which in the static case just consists of one point at the antipode, grows to form two interwoven closed surfaces when motion is introduced. It is further shown how they prevent causality violating null-like curves. The observed transversal motion of matter (the global rotation) is calculated. The conclusions concerning the causality of the universe which an observer might draw from the global rotation are discussed.

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