14.arch/AGR.blackston .ls 2 .na .LP Efficient Parallel Algorithms for the N-body Problem David Blackston (Professor A. G. Ranade) (NSF) CCR-90-05448 The N-body problem is a fundamental problem in computational physics: given N charges in space, the problem is to calculate the force on every charge due to all other charges. Recently, sequential algorithms capable of computing all of these forces in O(N) time have been developed. The goal of my research is to efficiently implement this algorithm on a parallel machine. This involves developing effective strategies to manipulate data structures such as quadtrees in parallel, as well as storing them on a distributed memory machine to minimize communication requirements. I also plan to work on issues such as pipelining and plan to produce fast parallel implementations as well as a theoretical analysis.