Weak lensing predictions at intermediate scales

Ludovic Van Waerbeke, Takashi Hamana, Román Scoccimarro, Stephane Colombi, Francis Bernardeau

    Research output: Contribution to journalArticle

    Abstract

    As pointed out in previous studies, the measurement of the skewness of the convergence field κ will be useful in breaking the degeneracy among the cosmological parameters constrained from weak lensing observations. The combination of shot noise and finite survey volume implies that such a measurement is likely to be performed in a range of intermediate scales (0.5 to 20 arcmin) where neither perturbation theory nor the hierarchical ansatz applies. Here we explore the behaviour of the skewness of κ at these intermediate scales, based on results for the non-linear evolution of the mass bispectrum. We combined different ray-tracing simulations to test our predictions, and we find that our calculations describe accurately the transition from the weakly non-linear to the strongly non-linear regime. We show that the single lens-plane approximation remains accurate even in the non-linear regime, and we explicitly calculate the corrections to this approximation. We also discuss the prospects of measuring the skewness in upcoming weak lensing surveys.

    Original languageEnglish (US)
    Pages (from-to)918-926
    Number of pages9
    JournalMonthly Notices of the Royal Astronomical Society
    Volume322
    Issue number4
    DOIs
    StatePublished - Apr 21 2001

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    skewness
    prediction
    predictions
    ray tracing
    shot noise
    approximation
    perturbation theory
    lenses
    perturbation
    simulation

    Keywords

    • Gravitational lensing
    • Large-scale structure of Universe

    ASJC Scopus subject areas

    • Space and Planetary Science

    Cite this

    Van Waerbeke, L., Hamana, T., Scoccimarro, R., Colombi, S., & Bernardeau, F. (2001). Weak lensing predictions at intermediate scales. Monthly Notices of the Royal Astronomical Society, 322(4), 918-926. https://doi.org/10.1046/j.1365-8711.2001.04241.x

    Weak lensing predictions at intermediate scales. / Van Waerbeke, Ludovic; Hamana, Takashi; Scoccimarro, Román; Colombi, Stephane; Bernardeau, Francis.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 322, No. 4, 21.04.2001, p. 918-926.

    Research output: Contribution to journalArticle

    Van Waerbeke, L, Hamana, T, Scoccimarro, R, Colombi, S & Bernardeau, F 2001, 'Weak lensing predictions at intermediate scales', Monthly Notices of the Royal Astronomical Society, vol. 322, no. 4, pp. 918-926. https://doi.org/10.1046/j.1365-8711.2001.04241.x
    Van Waerbeke L, Hamana T, Scoccimarro R, Colombi S, Bernardeau F. Weak lensing predictions at intermediate scales. Monthly Notices of the Royal Astronomical Society. 2001 Apr 21;322(4):918-926. https://doi.org/10.1046/j.1365-8711.2001.04241.x
    Van Waerbeke, Ludovic ; Hamana, Takashi ; Scoccimarro, Román ; Colombi, Stephane ; Bernardeau, Francis. / Weak lensing predictions at intermediate scales. In: Monthly Notices of the Royal Astronomical Society. 2001 ; Vol. 322, No. 4. pp. 918-926.
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