{
  "annotation_id": "774a8ebf-bf85-4755-9202-a84bff9623b8",
  "date_created": "2026-03-02T18:00:00.601000Z",
  "date_modified": "2026-03-02T18:00:00.601000Z",
  "file_hash": "623ba9121adaf4c43fcf66383f2e7c9b5cf7d996c6ae80cceb00d3662a0198da",
  "private": false,
  "record": {
    "abstract": "We calculate the density-dependent spin-asymmetry energy $S(k_f)$ of\nisospin-symmetric nuclear matter in the three-loop approximation of chiral\nperturbation theory. The interaction contributions to $S(k_f)$ originate from\none-pion exchange, iterated one-pion exchange, and (irreducible) two-pion\nexchange with no, single, and double virtual $\\Delta$-isobar excitation. We\nfind that the truncation to $1\\pi$-exchange and iterated $1\\pi$-exchange terms\n(which leads already to a good nuclear matter equation of state) is\nspin-unstable, since $S(k_{f0})\u003c0$. The inclusion of the chiral $\\pi\nN\\Delta$-dynamics guarantees the spin-stability of nuclear matter. The\ncorresponding spin-asymmetry energy $S(k_f)$ stays positive within a wide range\nof an undetermined short-range parameter $S_5$ (which we also estimate from\nrealistic NN-potentials). Our results reemphasize the important role played by\ntwo-pion exchange with virtual $\\Delta$-isobar excitation for the nuclear\nmatter many-body problem. Its explicit inclusion is essential in order to\nobtain good bulk and single-particle properties.",
    "arxiv_id": "nucl-th/0410021",
    "authors": [
      "N. Kaiser"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.70.054001",
    "journal_ref": "Phys.Rev. C70 (2004) 054001",
    "title": "Spin-asymmetry energy of nuclear matter",
    "url": "https://arxiv.org/abs/nucl-th/0410021"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d196b005-7685-47ab-b540-1e76a06fb67e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}