2003/10/29 by M. Demiański, M. Demianski, R. de Ritis +2 · 32 citations
Physics and Astronomy · #Angular diameter #Astronomy #Astrophysics #Black Holes and Theoretical Physics #Classical mechanics #Constant (computer programming) #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark energy #Distance measures #Galaxies: Formation, Evolution, Phenomena #Homogeneous #Mathematical physics #Metric expansion of space #Physics #Simple (philosophy) #Stars #Statistical physics #Theoretical physics #Universe #astro-ph
paper · pdf · doi:10.1051/0004-6361:20031234
published in Astronomy and Astrophysics 411(2), 33-40 (EDP Sciences) · 8 pages, 6 figures. Accepted accepted for publication in A&A, it is an substantially rewritten version of the earlier paper astro-ph/0004376
arxiv created 2003/10/29 · openalex publication_date 2003/11/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We discuss the general and approximate angular diameter distance in the Friedman-Robertson-Walker cosmological models with nonzero cosmological constant. We modify the equation for the angular diameter distance by taking into account the fact that locally the distribution of matter is non homogeneous. We present exact solutions of this equation in a few special cases. We propose an approximate analytic solution of this equation which is simple enough and sufficiently accurate to be useful in practical applications.