Controlling General Polynomial Networks

Abstract

We consider networks of massive particles connected by non-linear springs. Some particles interact with heat baths at different temperatures, which are modeled as stochastic driving forces. The structure of the network is arbitrary, but the motion of each particle is 1D. For polynomial interactions, we give sufficient conditions for Hörmander’s “bracket condition” to hold, which implies the uniqueness of the steady state (if it exists), as well as the controllability of the associated system in control theory. These conditions are constructive; they are formulated in terms of inequivalence of the forces (modulo translations) and/or conditions on the topology of the connections. We illustrate our results with examples, including “conducting chains” of variable cross-section. This then extends the results for a simple chain obtained in Eckmann et al. in (Commun Math Phys 201:657–697, 1999).

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Correspondence to J. -P. Eckmann.

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Communicated by H. Spohn

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Cuneo, N., Eckmann, J.P. Controlling General Polynomial Networks. Commun. Math. Phys. 328, 1255–1274 (2014). https://doi.org/10.1007/s00220-014-1966-4

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Keywords

  • Equivalence Class
  • Heat Bath
  • Controllable Particle
  • Vandermonde Determinant
  • Commun Math Phys