Exploring the Dark Side of the Universe

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Exploring the Dark Side of the Universe
Charles Baltay On the occasion of the Wonyong
Fest March 8, 2004
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The Universe as seen by an Astronomer
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The Universe as seen by a Cosmologist
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The Universe of a University Professor
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The Universe of a University Professor
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The Universe of a University Professor
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The Universe of a University Professor
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The Dark Components of the Universe

• Dark Matter 25-27
• First evidence came from rotation curves of
  galaxies
• We dont know what it is but we are use to it by
  now
• Attractive gravity
• Positive (Hot Dark Matter) on zero (Cold Dark
  Matter) Pressure
• Dark Energy 70-72
• Something weird and different to explain
  acceleration of expansion of the universe
• Repulsive gravity,
• Negative pressure
• Nothing like it in the Rosenfeld PDG tables