Cosmological Perturbations

  • Oliver PiattellaEmail author
Part of the UNITEXT for Physics book series (UNITEXTPH)


As we have seen in the previous Chapters, the assumption of homogeneous and isotropic universe is very useful and productive, but it is reliable only on very large scales (above 200 Mpc). Its shortcomings become evident when we start to investigate how structures, such as galaxies and their clusters, form, since these are huge deviations from the cosmological principle. In this Chapter we address small deviations from the cosmological principle, considering perturbations in the FLRW metric. This is the starting point of the incredibly difficult task of understanding how structures form in an expanding universe, which ultimately needs powerful machines and numerical simulations.


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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Núcleo Cosmo-UFES and Department of PhysicsFederal University of Espírito SantoVitóriaBrazil

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