3150017 0 dark energy 06850017 0 total 0999500065

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Unformatted text preview: sity of photons decreases as a(t)- ___. •  But, each photon is redshiSed, so the energy of each photon decreases as a(t)- __. •  Consequently, the total energy density of photons, ur, decreases as a(t)- __: __ ur (t ) = ur ,0 = ur ,0 ( ) ___ !T $ = ur ,0 # CMB & #T & " CMB ,0 % •  Consequently the radia8on energy density grows faster with redshiS than ______ or the cosmological constant, and dominated in the past 5/23/13 UW, ASTR 323, SP13, Eric Agol ©2013 10 Concordance Cosmology •  Flat Universe: Ω0+ΩΛ=1 within 0.65%! Parameter WMAP value Ωγ,0 Photons 5×10- 5 Ων,0 Neutrinos 3×10- 5 Ωr,0 Radia8on (γ+ν) 8×10- 5 Ωb,0 Baryons 0.0487±0.0018 Ωcdm,0 Dark maZer 0.2647±0.0098 Ωm,0 MaZer total 0.315±0.017 ΩΛ,0 Dark energy 0.685±0.017 Ω0 Total 0.9995±0.0065 h Hubble constant 0.673±0.012 t0 5/23/13 Cons,tuent Age 13.817±0.048 Gyr UW, ASTR 323...
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