From Hubble diagrams to scale factors
Abstract
We present a lower bound on the radius of the universe today a0 and a monotonicity constraint on the Hubble diagram. Our theoretical input is Einstein's kinematics and maximally symmetric universes. Present supernova data yield a0 > 1.2· 1026 m. A first attempt to quantify the monotonicity constraint is described. We do not see any indication of non-monotonicity.
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