{
  "annotation_id": "39ea810e-90f9-4763-a9d3-23f8b7178663",
  "date_created": "2026-03-02T18:00:07.827000Z",
  "date_modified": "2026-03-02T18:00:07.827000Z",
  "file_hash": "0bb6cee8229703c196e475486f32fbbca4f9a282093f9f29001b5881b09b7f0b",
  "private": false,
  "record": {
    "abstract": "Based on a recent chiral approach to nuclear matter we calculate the\nin-medium interaction of nucleons at the Fermi surface $|\\vec p_{1,2}|=k_f$.\nThe isotropic part of this quasi-particle interaction is characterized by four\ndensity dependent (dimensionful) Fermi-liquid parameters: $f_0(k_f), f_0\u0027(k_f),\ng_0(k_f)$ and $g_0\u0027(k_f)$. In the approximation to $1\\pi$-exchange and iterated\n$1\\pi$-exchange (which as such leads already to a good nuclear matter equation\nof state) we find a spin-isospin interaction strength of $g_0\u0027(2m_\\pi) = 1.14\n$fm$^2$, compatible with existing empirical values. In the next step we include\nsystematically the contributions from $2\\pi$-exchange with virtual\n$\\Delta(1232) $-isobar excitation which have been found important for good\nsingle-particle properties and spin-stability of nuclear matter. Without any\nadditional short distance terms the spin-dependent Fermi-liquid parameters\n$g_0(k_{f0})$ and $g\u0027_0(k_{f0})$ come out far too large. Estimates of these\nshort-distance parameters from realistic NN-potentials go in the right\ndirection, but sizeable enhancement factors are still needed to reproduce the\nempirical values of $g_0(k_{f0})$ and $g_0\u0027(k_{f0})$. This points towards the\nimportance of higher order iterations subsumed in the induced interaction. We\nconsider also the tensor part of the quasi-nucleon interaction at the Fermi\nsurface. In comparison to the leading $1\\pi$-exchange tensor interaction we\nfind from the $2\\pi$-exchange corrections almost a doubling of the isoscalar\ntensor strength $h_0(k_f)$, whereas the isovector tensor strength $h_0\u0027(k_f)$\nis much less affected. These features are not changed by the inclusion of the\nchiral $\\pi N\\Delta$-dynamics.",
    "arxiv_id": "nucl-th/0601100",
    "authors": [
      "N. Kaiser"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/j.nuclphysa.2006.01.003",
    "journal_ref": "Nucl.Phys.A768:99-117,2006",
    "title": "Quasi-particle interaction in nuclear matter from chiral pion-nucleon   dynamics",
    "url": "https://arxiv.org/abs/nucl-th/0601100"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "3e2375be-05ae-4a02-9419-60632dd85732",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}