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Proposing Institution

Leibniz-Institut für Astrophysik Potsdam (AIP)
Project Manager

Dr. Stefan Gottlöber
An der Sternwarte 16
14482 Potsdam
Abstract

The nonlinear dynamics of gravitational clustering in the expandinguniverse has been an active area of numerical research for manyyears. During past few years the formation, motion, and internaldynamics of galaxies and galaxy clusters became the most important andthe hottest issues in cosmology and in extragalactic astronomy. Highresolution is essential for the problem. We have developed a highlyefficient parallel Adaptive Refinement Tree (ART) code, which tracks theevolution of small perturbations from the early Universe till presenttime. Our code provides dynamical range of 100
000 and handles millionsof particles of different mass. Only the largest supercomputers areable to handle this kind of simulations. We would like to simulate theprocess of formation of many thousands of galaxies in an object, whichon 30-50 Megaparsec scale closely mimics the position and dynamics ofthe Local Supercluster -- the largest nearby concentration of galaxiesin space. This will be done by setting initial conditions usinglarge-scale constraints obtained from observational data. The focuswill be on confronting the model with extensive observational dataavailable for the Local Supercluster and on the history of formation ofthe Local Supercluster. The ART code is an N-body code, which reacheshigh force resolution by refining all high-density regions with anautomated recursive refinement algorithm. This produces a hierarchy ofirregular meshes at different levels of resolution on which the Poissonequation is solved efficiently. In order to increase the efficiency, thecode has adaptive spatial, time, and mass resolution. This state of theart code has been extensively tested and used on differentsupercomputers for the last two years.


Impressum, Conny Wendler