The apparent size of distant objects.

Details The apparent size of distant objects. The apparent size of distant objects.

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gregr..19..515h&link_type=abstract

General Relativity and Gravitation, Volume 19, Issue 5, pp.515-524

Physics

3

Cosmology:Space-Time

Scientific paper

A formula in terms of the exponential map is derived, which reveals for any observer in an arbitrary pseudo-Riemannian space-time the apparent diameter (i.e., the angular diameter) of any distant object. The formula shows immediately the existence of the effect of apparent distortion of the objects. It is proved that this distortion is absent if and only if the space-time is conformally flat.

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