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Unformatted text preview: . (2007) UW, ASTR 323, SP13, Eric Agol ©2013 0.10 Redshift 1.00 11 Cosmological parameters Kowalski et al. (2008) •  Joint constraints on ΩΛ & ΩM come from measurements of Supernova Ia distances (blue), sound waves in cosmic microwave background (orange), and large scale structure (green). •  The amazing thing is that all 3 overlap at the same loca8on! •  The other amazing thing is that the best- fit Universe is flat, i.e. ΩΛ + ΩM =1 5/28/13 UW, ASTR 323, SP13, Eric Agol ©2013 12 Time versus redshig •  The lookback 8me is 8me that has passed since light was emiRed at a par8cular redshig •  Compute from the metric: z = 1 / a − 1,$so dz / dt = −H / a = −H(1 + z),$so dz dt = − H(1 + z) •  Thus the lookback 8me is: t0 ∫ dt = te 5/28/13 z ∫ 0 dz" 1 ≈ H(z"...
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