Scale transformations, tree-level perturbation theory and the cosmological matter bispectrum

Jun Pan, Peter Coles, I. Szapudi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Scale transformations have played an extremely successful role in studies of cosmological large-scale structure by relating the non-linear spectrum of cosmological density fluctuations to the linear primordial power at longer wavelengths. Here, we generalize this approach to investigate the usefulness of scale transformations for non-linear higher order statistics, specifically the bispectrum. We find that the bispectrum predicted by perturbation theory at tree level can be rescaled to match the results of full numerical simulations in the weakly and intermediately non-linear regimes, especially at high redshifts, with an accuracy that is surprising given the simplicity of the procedure used. This discovery not only offers a simple practical way of calculating the matter bispectrum but also suggests that scale transformations may yet yield even deeper insights into the physics of hierarchical clustering.

Original languageEnglish
Pages (from-to)1460-1464
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Volume382
Issue number4
DOIs
Publication statusPublished - Dec 2007

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perturbation theory
perturbation
physics
wavelength
statistics
simulation
wavelengths

Keywords

  • Cosmology: theory
  • Large-scale structure of Universe

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Scale transformations, tree-level perturbation theory and the cosmological matter bispectrum. / Pan, Jun; Coles, Peter; Szapudi, I.

In: Monthly Notices of the Royal Astronomical Society, Vol. 382, No. 4, 12.2007, p. 1460-1464.

Research output: Contribution to journalArticle

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