The Etherington's distance-duality equation is the relationship between the luminosity distance of standard candles and the angular diameter distance. La relation de dualité des distances d'Etherington est la relation entre la distance de luminosité des Chandelles standard et la distance de diamètre angulaire.
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The equation is as follows: d L = ( 1 + z ) 2 d A {\displaystyle d_{L}=(1+z)^{2}d_{A}} , where d L {\displaystyle d_{L}} is the luminosity distance and d A {\displaystyle d_{A}} the angular-diameter distance. L'équation est la suivante: d L = ( 1 + z ) 2 d A
