What are the informations deducible from hubble diagram of supernova 1a?

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What are the informations deducible from Hubble diagram of supernova 1a?
 
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The relationship being determined is luminosity distance vs. redshift. Different cosmological models with different values of Ω0 and ΩΛ predict different forms for this relation. In particular, models with non-zero ΩΛ tend to have luminosity distances that are larger at any given redshift (meaning that objects appear systematically fainter than one would expect in the zero lambda case).

Luminosity distance is the distance inferred from the inverse-square law for intensity of light. In other words, it is the distance measure obtained by assuming that this law holds true. Luminosity distance may not correspond to physical distance due to the expansion of the universe, and curvature, if any.

EDIT: Forgot to mention that since SNe Ia are standard candles (at least reasonably so, we think), determining luminosity distances for them is easy, and since they are quite luminous, this can be done out to very large redshifts, provided you do a coordinated survey to search for them.
 
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