7250002 k almost perfectly isotropic varies in

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Unformatted text preview: !! UW, ASTR 323, SP13, Eric Agol ©2013 = 6 Density parameter •  Define density of matter, radiation & cosmological constant in terms of uC: u(t ) Ω(t ) ≡ = uC (t ) •  Note: both u & uC change with ______. •  This is defined for matter, radiation, and Λ •  The value of Ω=Ωm+Ωr+ΩΛ now is _____ •  Ω0=1 means the Universe is flat. 5/23/13 UW, ASTR 323, SP13, Eric Agol ©2013 7 Curvature of the universe 5/23/13 UW, ASTR 323, SP13, Eric Agol ©2013 8 Cosmic Microwave Background •  Near perfect blackbody TCMB,0=2.725±0.002 K •  Almost perfectly isotropic – varies in brightness by 1 part in ______ •  About 2 billion photons for every baryon 5/23/13 2hν 3 1 Iν = 2 hν / kT ce −1 !! € ur ,0 = 4σ SB UW, ASTR 323, SP13, Eric Agol ©2013 c TC4 B ,0 = 5 × 10−5 ρc ,0c 2 M 9 Evolu8on of radia8on •  The den...
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