Physics 133: Extragalactic Astronomy ad Cosmology Lecture 7; January 29 2014.

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Presentation transcript:

Physics 133: Extragalactic Astronomy ad Cosmology Lecture 7; January

Previously. I: Curvature only: –a(t) linear in time –t0H0=1 –Horizon infinite Flat with w: –a(t) scales as t to the power of 2/(3+3w) –t0H0=2/3(1+w) –Horizon can be finite

Previously. II: Matter only: –a(t) scales as t to the power of 2/3 –t0H0=2/3 –Horizon finite Radiation only: –a(t) scales as t to the power of 1/2 –t0H0=1/2 –Horizon finite

Previously. III: Λ only: –a(t) exponential in t –Infinite Age –Infinite horizon

Multiple component Universes. Introduction The universe is more complicated than this. We know for sure that there are at least two components They are? What happens when we have multiple components?

Outline: Modeling the Universe. Let ’ s get real! Generalized Friedmann Equation. Multiple components: –Matter + Curvature –Matter + Λ –Matter+curvature+Λ –Radiation + Matter The current best guess. Concordance cosmology or “ benchmark model ”

Generalized Friedmann Equation [Blackboard]

Matter + curvature New phenomena appear… For example, the big crunch! [Black board]

Matter + Λ The cosmological constant can induce acceleration The big chill Close to our model of the universe [Black board]

Matter + Curvature + Λ New phenomena.. For example the “Big Bounce” [Black board] “ Big bounce ”

Matter + Radiation Good description of the Universe at early times. Is what we need to find epoch of radiation dominance [Black board]

“ Concordance cosmology ” or “ Benckmark model ” Our current best guess [Black board]

Concordance cosmology or Benchmark model Plank paper XVI

Concordance cosmology. Do the various methods agree? They do! This is called “ concordance cosmology ” We will come back to all these measurements… Betoule et al. 2014

Concordance cosmology. Happy campers?

Multiple component Universes. Summary Generalized Friedmann Equation. Four free parameters They are? Matter + Curvature (Big Crunch) Matter + Λ (Big Chill), simplest model close to concordance cosmology.

Summary: Matter + Curvature + Λ –Big Bounce or various scenarios Radiation + Matter –Good for the early universe The current best guess. Concordance cosmology or “ benchmark model ” –Next time we will see how people get to this answer!

The End See you on monday!