{
  "id": "2307.12320",
  "version": "v1",
  "published": "2023-07-23T13:16:10.000Z",
  "updated": "2023-07-23T13:16:10.000Z",
  "title": "Action for classical, quantum, closed and open systems",
  "authors": [
    "Janos Polonyi"
  ],
  "comment": "39 pages 4 figures",
  "categories": [
    "quant-ph",
    "hep-th"
  ],
  "abstract": "The action functional can be used to define classical, quantum, closed, and open dynamics in a generalization of the variational principle and in the path integral formalism in classical and quantum dynamics, respectively. These schemes are based on an unusual feature, a formal redoubling of the degrees of freedom. Five arguments to motivate such a redoubling are put forward to demonstrate that such a formalism is natural. The common elements of the different arguments is the causal time arrow. Some lessons concerning decoherence, dissipation and the classical limits are mentioned, too.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-07-23T13:16:10.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "open systems",
      "causal time arrow",
      "path integral formalism",
      "open dynamics",
      "unusual feature"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 39,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}