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Reminders
1 Online Quiz Chapter 16 Due Wednesday at11:59PM
2 Online Quiz Chapter 7 Due Saturday at11:59PM
3 Read Chaps: 16, 7, 8, 184 Final Exam Wed Dec 16, 8:00am
1
Cosmological Principle
Universe is homogeneousUniverse is isotropicCMBR: Penzias and Wilson, remnant fromthe Big BangObservational confirmation of CosmologicalPrinciple
4
Fate of the Universe Depends onDensity
Hubble’s Lawv = H0d
Critical Density: Density Just Needed toClose the Universe ρcr
Omega’s: Ratio of Density to Critical Density
ΩB =ρb
ρcr
ΩM =ρM
ρcr19
Supernova Cosmology Project: SNdiscovery
SupernovaDiscovery
(as seen from Hubble SpaceTelescope)
Difference
(as seen fromtelescopes on Earth)
3 Weeks Before
Supernova 1998baSupernova Cosmology Project
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SNe Ia are Correctable Candles
-20 0 20 40 60
-15
-16
-17
-18
-19
-20
-20 0 20 40 60
-15
-16
-17
-18
-19
-20
B Band
as measured
light-curve timescale“stretch-factor” corrected
days
MB
– 5
log(
h/6
5)
days
MB
– 5
log(
h/6
5)
Calan/Tololo SNe Ia
Kim, et al. (1997)
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Age and Fate of the Universe
Geometry and Fate of the Universe
Ω and Λ
Inflation: Horizon and Flatness ProblemsDark Matter: Neutrinos, MACHOS, WIMPsDark Energy
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Cosmology Summary
Universe is Flat: CBRΩM + ΩΛ = 1ΩM ∼ 0.3 : Rich ClustersΩΛ ∼ 0.7 : Type Ia SupernovaeΩb ∼ 0.03: Big Bang Nucleosynthesis
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