2 Cosmological Perturbation Theory

  • Ruth Durrer
Part I The Early Universe According to General Relativity: How Far We Can Go
Part of the Lecture Notes in Physics book series (LNP, volume 653)


This is a review on cosmological perturbation theory. After an introduction, it presents the problem of gauge transformation. Gauge invariant variables are introduced and the Einstein and conservation equations are written in terms of these variables. Some examples, especially perfect fluids and scalar fields are presented in detail. The generation of perturbations during inflation is studied. Lightlike geodesics and their relevance for CMB anisotropies are briefly discussed. Perturbation theory in braneworlds is also introduced.


Energy Momentum Tensor Scalar Perturbation Vector Perturbation Tensor Perturbation Radiation Perturbation 
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Authors and Affiliations

  • Ruth Durrer
    • 1
  1. 1.Université de Genève, Département de Physique Théorique, 24 Quai E. Ansermet, 1211 GenèveSwitzerland

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