ar X iv : a st ro - p h / 98 07 12 1 v 1 1 3 Ju l 1 99 8 COSMOLOGICAL ADAPTIVE MESH REFINEMENT
نویسنده
چکیده
We describe a grid-based numerical method for 3D hydrody-namic cosmological simulations which is adaptive in space and time and combines the best features of higher order–accurate Godunov schemes for Eulerian hydrodynamics with adaptive particle–mesh methods for collision-less particles. The basis for our method is the structured adaptive mesh refinement (AMR) algorithm of Berger & Collela (1989), which we have extended to cosmological hydro + N-body simulations. The resulting mul-tiscale hybrid method is a powerful alternative to particle-based methods in current use. The choices we have made in constructing this algorithm are discussed, and its performance on the Zeldovich pancake test problem is given. We present a sample application of our method to the problem of first structure formation. We have achieved a spatial dynamic range L box /∆x > 250, 000 in a 3D multispecies gas + dark matter calculation, which is sufficient to resolve the formation of primordial protostellar cloud cores starting from linear matter fluctuations in an expanding FRW universe .
منابع مشابه
ar X iv : a st ro - p h / 98 03 21 2 v 1 1 8 M ar 1 99 8 Anisotropy of CMB & Cosmological Model
In this brief review I will touch upon the main points and trends of observational and theoretical cosmology, that influence and change today our understanding of the Universe.
متن کاملar X iv : a st ro - p h / 99 07 36 3 v 1 2 6 Ju l 1 99 9 The complete explanation and implications of the deep space anomaly
Shown are that the current notion of cosmological expansion is contradicted by the equivalence principle, and that the correct theory involves a fundamental principle of physical scale predicting the cosmological constant, planetary Hubble flow and all aspects of the deep space anomaly.
متن کاملar X iv : a st ro - p h / 96 07 14 6 v 1 2 9 Ju l 1 99 6 An Optical Ultrahigh Resolution Spectrograph for Use with Adaptive Optics
متن کامل
ar X iv : a st ro - p h / 98 07 18 3 v 1 1 7 Ju l 1 99 8 Neutrino spin - flips in curved space - time
The general relativistic effects on spin-flavor oscillations above the core of type II supernovae are investigated. The evolution equation is derived and the relative magnitudes of the terms in the Hamiltonian, which arise from the weak, electromagnetic and gravitational interaction, are compared. The effects on the resonance position and the adiabaticity are studied. Explicit calculations are ...
متن کامل