Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436..542g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 436, no. 2, p. 542-546
Astronomy and Astrophysics
Astrophysics
2
Astronomical Models, Cosmology, Density Distribution, Spectral Methods, Universe, Velocity Distribution, Fast Fourier Transformations, Mathematical Models
Scientific paper
The psudeospectral method is proposed for tracing the evolution of density and velocity fluctuations in the weakly nonlinear stage of the expanding universe with good accuracy. In this method, the evolution of density and velocity fluctuations is integrated in Fourier space using the fast Fourier transformation. The method is well suited to an accurate investigation of dynamics in weakly nonlinear evolution. Furthermore, one can recover primordial density and velocity fluctuations by integrating the evolution of density and velocity fluctuations backward in time by the psudeospectral method, while using a fitting formula to impose the relation between density and velocity fields that holds in the weakly nonlinear regime.
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