The mass density field in simulated non-Gaussian scenarios
نویسندگان
چکیده
منابع مشابه
The mass density field in simulated non-Gaussian scenarios
In this work we study the properties of the mass density field in the non-Gaussian world models simulated by Grossi et al. (2007). We find that the imprints of primordial non-Gaussianity are preserved during the evolution in the low-density tail of the one-point density probability distribution function. Deviations of the order of 10-20 per cent from the Gaussian case can be found out to the pr...
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The primordial mass density fluctuations may have arisen from quantum fluctuations in a (massless) scalar field that occurred during an inflationary era. We show that it is possible for primordial mass density fluctuations, which arose in this way, to be highly non-Gaussian. We also show that the “bad” infrared properties of the propagator for a massless scalar field in de Sitter space can tran...
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We have performed high-resolution cosmological N-body simulations of a concordance ΛCDM model to study the evolution of virialized, dark matter haloes in the presence of primordial non-Gaussianity. Following a standard procedure, departures from Gaussianity are modeled through a quadratic Gaussian term in the primordial gravitational potential, characterized by a dimensionless non-linearity str...
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We calculate the higher order moments in a sequence of models where the initial density fluctuations are drawn from a χ ν distribution with a power-law power spectrum. For large values of ν the distribution is approximately gaussian, and we reproduce the values known from perturbation theory. As ν is lowered the distribution becomes progressively more non-gaussian, approximating models with rar...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2008
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2008.13783.x