{
  "id": "1810.06062",
  "version": "v1",
  "published": "2018-10-14T17:04:12.000Z",
  "updated": "2018-10-14T17:04:12.000Z",
  "title": "A pseudo-conformal structure in dense baryonic matter",
  "authors": [
    "Yong-Liang Ma",
    "Mannque Rho"
  ],
  "comment": "17 pages, 8 figures",
  "categories": [
    "nucl-th",
    "hep-ph"
  ],
  "abstract": "We sharpen and extend further the idea developed in \\cite{PKLMR,MLPR} that baryonic matter at high density has an emergent \"pseudo-conformal symmetry.\" It is argued that as baryonic density exceeds $n \\simeq n_{1/2} \\gtrsim 2n_0$, a topology change mimicking the baryon-quark continuity takes place at $n_{1/2}$. In terms of skyrmions, this corresponds to the transition from skyrmions to half-skyrmions and impacts on the equation of state of dense baryonic matter. The emergence in medium at $n_{1/2}$ of parity-doublet symmetry -- which is invisible in QCD in matter-free vacuum -- plays the crucial role. The consequence of the topology change is that massive compact stars carry the \"pseudo-conformal sound velocity\" $v_s^2/c^2\\approx 1/3$ at $n\\gsim n_{1/2}$ signaling a precursor to precocious emergence of scale symmetry as well as {a} local symmetry hidden in QCD in the matter-free vacuum. A highly significant prediction of this work is that the topology change density from normal matter to half-skyrmion matter, up-to-date inaccessible either by QCD proper or by terrestrial experiments, could possibly be pinned down within the range $2 < n_{1/2}/n_0 < 4$, commensurate with the range expected for a continuous hadrons-to-quarks/gluons transition.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-10-14T17:04:12.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dense baryonic matter",
      "pseudo-conformal structure",
      "matter-free vacuum",
      "massive compact stars carry",
      "topology change density"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}