Memory of initial conditions in gravitational clustering

Martín Crocce, Román Scoccimarro

    Research output: Contribution to journalArticle

    Abstract

    We study the nonlinear propagator, a key ingredient in renormalized perturbation theory (RPT) that allows a well-controlled extension of perturbation theory into the nonlinear regime. We show that it can be thought as measuring the memory of density and velocity fields to their initial conditions. This provides a clean definition of the validity of linear theory, which is shown to be much more restricted than usually recognized in the literature. We calculate the nonlinear propagator in RPT and compare to measurements in numerical simulations, showing remarkable agreement well into the nonlinear regime. We also show that N-body simulations require a rather large volume to recover the correct propagator, due to the missing large-scale modes. Our results for the nonlinear propagator provide an essential element to compute the nonlinear power spectrum in RPT.

    Original languageEnglish (US)
    Article number063520
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume73
    Issue number6
    DOIs
    StatePublished - 2006

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Physics and Astronomy (miscellaneous)

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