On well-separated sets and fast multipole methods

  • Authors:
  • Stefan Engblom

  • Affiliations:
  • Department of Numerical Analysis, School of Computer Science and Communication, Royal Institute of Technology, S-100 44 Stockholm, Sweden

  • Venue:
  • Applied Numerical Mathematics
  • Year:
  • 2011

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Abstract

The notion of well-separated sets is crucial in fast multipole methods as the main idea is to approximate the interaction between such sets via cluster expansions. We revisit the one-parameter multipole acceptance criterion in a general setting and derive a relative error estimate. This analysis benefits asymmetric versions of the method, where the division of the multipole boxes is more liberal than in conventional codes. Such variants offer a particularly elegant implementation with a balanced multipole tree, a feature which might be very favorable on modern computer architectures.