Modification of Weakly Nonlinear Mode Couplings Due to the Periodic Boundary Condition

Details Modification of Weakly Nonlinear Mode Couplings Due to the Periodic Boundary Condition Modification of Weakly Nonlinear Mode Couplings Due to the Periodic Boundary Condition

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...523...24s&link_type=abstract

The Astrophysical Journal, Volume 523, Issue 1, pp. 24-31.

Astronomy and Astrophysics

Astronomy

10

Cosmology: Theory, Cosmology: Large-Scale Structure Of Universe

Scientific paper

The periodic boundary condition is usually imposed on cosmological N-body simulations. We investigate effects of this artificial condition on the weakly nonlinear mode couplings induced by gravity at scales comparable to the side length of a simulation box. Using the framework of the higher order Eulerian perturbation theory, we examine modifications of the skewness parameters and the second-order power spectra for power-law initial fluctuations. We show quantitatively that these modifications depend on the initial spectral index as well as the spatial scale relative to the side length.

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