Lecture 20 Hubble Time – Scale Factor. ASTR 340 Fall 2006 Dennis Papadopoulos. Hubble’s Law. Hubble interpreted redshift-distance relationship as a linear increase of the recession velocity of external galaxies with their distance Mathematically, the Hubble law is v=H d
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where v=velocity and d=distance
Metric is invariant
f, g, h Metric coefficients
2D space-time metric
Spherical spaces (closed; k=+1)
Hyperbolic spaces (open; k=-1)