{
  "annotation_id": "bedd212e-3907-4e5c-bbc9-e2dbb8f47524",
  "date_created": "2026-03-02T18:01:18.016000Z",
  "date_modified": "2026-03-02T18:01:18.016000Z",
  "file_hash": "7aec4b498c0afe17e945275e5ca89f820670a0db748c941a357be31f14c282b2",
  "private": false,
  "record": {
    "abstract": "Though entropy production is forbidden in standard FRW Cosmology, Berman and\nSom presented a simple inflationary model where entropy production by bulk\nviscosity, during standard inflation without ad hoc pressure terms can be\naccommodated with Robertson-Walker\u0027s metric, so the requirement that the early\nUniverse be anisotropic is not essential in order to have entropy growth during\ninflationary phase, as we show. Entropy also grows due to shear viscosity, for\nthe anisotropic case. The intrinsically inflationary metric that we propose can\nbe thought of as defining a polarized vacuum, and leads directly to the desired\neffects without the need of introducing extra pressure terms.",
    "arxiv_id": "physics/0701070",
    "authors": [
      "Marcelo Samuel Berman",
      "Murari M. Som"
    ],
    "categories": [
      "physics.gen-ph",
      "physics.class-ph"
    ],
    "doi": "10.1007/s10509-007-9514-8",
    "journal_ref": "Astrophys.SpaceSci.310:277-279,2007",
    "title": "Natural Entropy Production in an Inflationary Model for a Polarized   Vacuum",
    "url": "https://arxiv.org/abs/physics/0701070"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d720c69c-90cf-457d-a791-6dae3ec7cf20",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}