2 Clustering in the Expanding Universe

 2.1 The cosmological principle
 2.2 From the Einstein equation to the Friedmann equation
 2.3 Expansion law and age of the Universe
 2.4 Einstein’s static model and Lemaître’s model
 2.5 Vacuum energy as an effective cosmological constant
 2.6 Gravitational instability
 2.7 Linear growth rate of the density fluctuation

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