NDLI: A test of the adhesion approximation for gravitational clustering

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A test of the adhesion approximation for gravitational clustering

Content Provider	NASA Technical Reports Server (NTRS)
Author	Melott, Adrian L. Shandarin, Sergei Weinberg, David H.
Copyright Year	1993
Description	We quantitatively compare a particle implementation of the adhesion approximation to fully non-linear, numerical 'N-body' simulations. Our primary tool, cross-correlation of N-body simulations with the adhesion approximation, indicates good agreement, better than that found by the same test performed with the Zel-dovich approximation (hereafter ZA). However, the cross-correlation is not as good as that of the truncated Zel-dovich approximation (TZA), obtained by applying the Zel'dovich approximation after smoothing the initial density field with a Gaussian filter. We confirm that the adhesion approximation produces an excessively filamentary distribution. Relative to the N-body results, we also find that: (a) the power spectrum obtained from the adhesion approximation is more accurate than that from ZA or TZA, (b) the error in the phase angle of Fourier components is worse than that from TZA, and (c) the mass distribution function is more accurate than that from ZA or TZA. It appears that adhesion performs well statistically, but that TZA is more accurate dynamically, in the sense of moving mass to the right place.
File Size	597904
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19950012943
Archival Resource Key	ark:/13960/t13n72s1t
Language	English
Publisher Date	1993-01-01
Access Restriction	Open
Subject Keyword	Thermodynamics And Statistical Physics Galactic Clusters Normal Density Functions Gravitational Effects Power Spectra Phase Shift Galactic Evolution Cross Correlation Mass Distribution Nonlinearity Density Distribution Many Body Problem Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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