Primordial fluctuations and non-linear structure

Details Primordial fluctuations and non-linear structure Primordial fluctuations and non-linear structure

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..295l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Nov. 15, 1991, p. 295-306. Research supported by N

Statistics

Computation

70

Density Distribution, Gravitational Fields, Power Spectra, Universe, Computational Astrophysics, Cosmology, Wavelengths

Scientific paper

Several aspects of nonlinear gravitational instability are explored using two numerical experiments, each of which employs a series of 3D cosmological N-body simulations. In the first experiment, all of the initial high-frequency power is truncated above some critical wavenumber, in the second experiment, initial Fourier components are replaced with wavenumbers greater than critical by waves taken from an independent realization with the same power spectrum but with unrelated phases. These initial conditions are evolved for different values of critical wavenumbers to see how the progressive elimination or substitution of initial high-frequency components affects the final, nonlinear structure.

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