Relativistic initial conditions for N-body simulations
نویسندگان
چکیده
منابع مشابه
Initial Conditions to Cosmological N -body Simulations, or How to Run an Ensemble of Simulations
The conventional method of generating initial conditions for cosmological N -body simulations introduces a significant error in the real-space statistical properties of the particles. More specifically, the finite box size leads to a significant underestimate of σ8, the correlation function, and nonlinear effects. I implement a method of generating initial conditions for N -body simulations tha...
متن کاملAn alternative to grids and glasses: Quaquaversal pre-initial conditions for N-body simulations
N-body simulations sample their initial conditions on an initial particle distribution, which for cosmological simulations is usually a glass or grid, whilst a Poisson distribution is used for galaxy models, spherical collapse etc. These pre-initial conditions have inherent correlations, noise due to discreteness and preferential alignments, whilst the glass distribution is poorly defined and c...
متن کاملN-body simulations with generic non-Gaussian initial conditions I: Power Spectrum and halo mass function
We address the issue of setting up generic non-Gaussian initial conditions for N-body simulations. We consider inflationary-motivated primordial nonGaussianity where the perturbations in the Bardeen potential are given by a dominant Gaussian part plus a non-Gaussian part specified by its bispectrum. The approach we explore here is suitable for any bispectrum, i.e. it does not have to be of the ...
متن کاملOn the problem of initial conditions in cosmological N- body simulations
– Cosmological N-body simulations aim to calculate the non-linear gravitational growth of structures via particle dynamics. A crucial problem concerns the setting-up of the initial particle distribution, as standard theories of galaxy formation predict the properties of the initial continuous density field with small amplitude correlated Gaussian fluctuations. The discretisation of such a field...
متن کاملTransients from initial conditions based on Lagrangian perturbation theory in N-body simulations
We explore the initial conditions for cosmological N-body simulations suitable for calculating the higher-order cumulants of the density field. In general, the initial conditions based on the perturbation theory (PT) provide incorrect growth in next leading order, which are called transients. Before transients have been completely suppressed compared with the dominant growing mode, we can not r...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2017
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2017/06/043