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Open Subsystems of Conservative Systems

In: Numerical Mathematics and Advanced Applications

Author

Listed:
  • Alexander Figotin

    (University of Californina)

  • Stephen P. Shipman

    (Louisiana State University)

Abstract

The subject under study is an open subsystem of a larger linear and conservative system and the way in which it is coupled to the rest of system. Examples are a model of crystalline solid as a lattice of coupled oscillators with a finite piece constituting the subsystem, and an open system such as the Helmholtz resonator as a subsystem of a larger conservative oscillatory system. Taking the view of an observer accessing only the open subsystem we ask, in particular, what information about the entire system can be reconstructed having such limited access. Based on the unique minimal conservative extension of an open subsystem, we construct a canonical decomposition of the conservative system describing, in particular, its parts coupled to and completely decoupled from the open subsystem. The coupled one together with the open system constitute the unique minimal conservative extension. Combining this with an analysis of the spectral multiplicity, we show, for the lattice model in particular, that only a very small part of all possible oscillatory motion of the entire crystal, described canonically by the minimal extension, is coupled to the finite subsystem.

Suggested Citation

  • Alexander Figotin & Stephen P. Shipman, 2006. "Open Subsystems of Conservative Systems," Springer Books, in: Alfredo Bermúdez de Castro & Dolores Gómez & Peregrina Quintela & Pilar Salgado (ed.), Numerical Mathematics and Advanced Applications, pages 1220-1227, Springer.
    • Handle: RePEc:spr:sprchp:978-3-540-34288-5_123
    DOI: 10.1007/978-3-540-34288-5_123
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