Titel

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Titel
The Oldest Memory The Echo of the Big Bang
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What is the oldest memory?

• First question What is the start of time?
• Creation of the universe The Big Bang!
• Is there any memory of this event?

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1965 Penzias Wilson
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Blackbody radiation
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Cosmic Microwave Background
2,725 0.002 K
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What is the CMB?

• Universe is expanding (Hubble flow)- Doppler
  Effect
• Expanding blackbody Still a blackbody, but
  cooler
• CMB The cooled down blackbody named Universe
• ? Universe started in a hot, dense state
• CMB is The Echo of this Big Bang
• (This was already predicted by Gamov in the 40s)

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Measuring the Anisotropy
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WMAP The raw data
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Subtracting the Doppler Dipole
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Substracting the Galaxy
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What to learn from the CMB?

• Anisotropies are caused by slight inhomogenities
• Inhomogenities interact with sound speed
• Cosmic expansion decouples light from matter ?
  CMB shows last scattering surface
• Results in length scale ? allows to measure the
  geometry of the universe
• Geometry related to fundamental parameters

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Results Power Spectrum
? The Universe is flat!
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Fundamental Parameters

• Relative Abundance
• Usual (Baryonic) Matter 4.4 0.4
• Total Matter 27.0 4.0
• Dark Energy 73.0 4.0
• ? We only know about 5 of our universe!

So... Plenty of work to do!
For more information http//map.gsfc.nasa.gov/