Inferring the linear power spectrum from the Lyα forest

Matias Zaldarriaga, Román Scoccimarro, Lam Hui

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We discuss the determination of the linear power spectrum of dark matter fluctuations from measurements of the transmitted flux Lyaα forest power spectrum. We show that on most scales probed by current measurements, the flux power spectrum is significantly affected by nonlinear corrections to the linear dark matter power spectrum due to gravitational clustering. Inferring the linear dark matter power spectrum shape is therefore difficult due to nonlinear corrections driving the nonlinear power spectrum to a k-1.4 shape nearly independent of initial conditions. We argue that some methods used in previous estimates underestimate the uncertainties in the shape of the linear dark matter power spectrum.

    Original languageEnglish (US)
    Pages (from-to)1-7
    Number of pages7
    JournalAstrophysical Journal
    Volume590
    Issue number1 I
    DOIs
    StatePublished - Jun 10 2003

    Keywords

    • Cosmology: theory
    • Intergalactic medium
    • Large-scale structure of universe
    • Quasars: absorption lines

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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