{
  "annotation_id": "d565a648-13b4-4f67-9524-8453230c7e46",
  "date_created": "2026-03-02T18:01:53.171000Z",
  "date_modified": "2026-03-02T18:01:53.171000Z",
  "file_hash": "54f1d51d5b323bf9e9a26dd484118574ba2714acdfa70859a842514c3df2a3ba",
  "private": false,
  "record": {
    "abstract": "Two approaches toward the arrow of time for scattering processes have been\nproposed in rigged Hilbert space quantum mechanics. One, due to Arno Bohm,\ninvolves preparations and registrations in laboratory operations and results in\ntwo semigroups oriented in the forward direction of time. The other, employed\nby the Brussels-Austin group, is more general, involving excitations and\nde-excitations of systems, and apparently results in two semigroups oriented in\nopposite directions of time. It turns out that these two time arrows can be\nrelated to each other via Wigner\u0027s extensions of the spacetime symmetry group.\nFurthermore, their are subtle differences in causality as well as the\npossibilities for the existence and creation of time-reversed states depending\non which time arrow is chosen.",
    "arxiv_id": "quant-ph/0210058",
    "authors": [
      "Robert C. Bishop"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Quantum Time Arrows, Semigroups and Time-Reversal in Scattering",
    "url": "https://arxiv.org/abs/quant-ph/0210058"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "5ac875a9-00bf-4e4e-8981-f5e2d83e3e40",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}