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    TH Cosmo Coffee

    Resummation in cosmological perturbation theory.

    by Dr Thomas Konstandin (DESY)

    → Europe/Zurich
    4/2-011 - TH common room (CERN)

    4/2-011 - TH common room

    CERN

    15
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    Description
    Cosmological perturbation theory is an analytical tool to determine the dark matter power spectrum from the primordial fluctuations. However, it fails to converge at late times due to non-linear effects. In this talk we discuss several approaches to resummation in cosmological perturbation theory. After a short introduction, standard perturbation theory (SPT), renormalized perturbation theory (RPT) and the eikonal approximation are reviewed. Finally, a generalization to RPT is presented that elucidates the relation between these schemes.