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Pierre Salati Université de Savoie LAPTH

• Constante cosmologique et observations le test
  des supernovae SNeIa lointaines.
• Quintessence et champ scalaire primordial.
• Matière noire astronomique et champ scalaire.

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Observational evidence for a non-vanishing
cosmological constant.
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To summarize, the Ricci tensoris given by
and
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The stress-energy content of the universe is
described by
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The propagation of light and the red-shift
photon geodesic
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The cosmic microwave background
COBE
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Cosmological observations
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