Israel Journal of Mathematics

, Volume 145, Issue 1, pp 221–241 | Cite as

Existence proof for orthogonal dynamics and the Mori-Zwanzig formalism

  • Dror Givon
  • Raz Kupferman
  • Ole H. Hald


We study the existence of solutions to the orthogonal dynamics equation, which arises in the Mori-Zwanzig formalism in irreversible statistical mechanics. This equation generates the random noise associated with a reduction in the number of variables. IfL is the Liouvillian, or Lie derivative associated with a Hamiltonian system, andP an orthogonal projection onto a closed subspace ofL 2, then the orthogonal dynamics is generated by the operator (IP)L. We prove the existence of classical solutions for the case whereP has finite-dimensional range. In the general case, we prove the existence of weak solutions.


Weak Solution Conditional Expectation Volterra Equation Energy Inequality Hamiltonian Vector Field 
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Copyright information

© Hebrew University 2005

Authors and Affiliations

  1. 1.Institute of MathematicsThe Hebrew University of Jerusalem Givat RamJerusalemIsrael
  2. 2.Department of MathematicsLawrence Berkeley LaboratoryBerkeleyUSA
  3. 3.Department of MathematicsUniversity of CaliforniaBerkeleyUSA

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