EVOLUTION OF THE POTENTIAL IN COSMOLOGICAL GRAVITATIONAL CLUSTERING

Details EVOLUTION OF THE POTENTIAL IN COSMOLOGICAL GRAVITATIONAL CLUSTERING EVOLUTION OF THE POTENTIAL IN COSMOLOGICAL GRAVITATIONAL CLUSTERING

1995-04-24

arxiv.org/abs/astro-ph/9504087v3

Astrophys.J. 456 (1996) 65-70

Astronomy and Astrophysics

Astrophysics

6 pages, uufiles uuencoded and compressed Postscript files, including figures, except Fig. 1 which is available in gzipped and

Scientific paper

10.1086/176627

The potential is a constant to linear order in cosmological gravitational clustering. In this Letter we present results of testing the conjecture, proposed by Pauls and Melott (1995), that the effect of nonlinear evolution on the potential can be better described by smoothing it on the scale of nonlinearity. We show two-dimensional simulations consisting of an N-body code in which particles are accelerated not by their mutual attraction, but by the gradient of the initial potential smoothed on the current scale of nonlinearity. This approximation produces results considerably improved over using a constant potential to move particles, and it is generally better than any approximation we have tested, lending further support to the smoothing description of the evolved potential.

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