{
  "id": "1811.07071",
  "version": "v2",
  "published": "2018-11-17T01:18:45.000Z",
  "updated": "2019-11-25T14:54:32.000Z",
  "title": "Sound velocity and tidal deformability in compact stars",
  "authors": [
    "Yong-Liang Ma",
    "Mannque Rho"
  ],
  "comment": "Version to appear in Phys. Rev. D",
  "categories": [
    "nucl-th",
    "hep-th"
  ],
  "abstract": "The sound velocity $v_s$ and dimensionless tidal deformability $\\Lambda$ are analyzed using the pseudo-conformal model we developed before. In contrast to the conclusion obtained in the previous works in the literature, our model with the upper bound of the sound velocity $v_s = 1/\\sqrt{3}$, the so-called conformal sound velocity, set in at a { density relevant to compact stars} $\\gsim 2 n_0$ where $n_0$ is the normal nuclear matter density, can accommodate {\\it all} presently established nuclear matter and compact-star properties including the maximum star-mass constraint $ \\simeq 2.3 M_\\odot$. This observation is associated with a possible emergence of pseudoconformal structure in compact star matter---in which the trace of energy-momentum tensor is a nearly density-independent nonzero constant---brought in by a topology change at $2.0 \\lesssim n_{1/2}/n_0 \\lesssim 4.0$ commensurate with a possible change of degrees of freedom from hadrons.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2019-11-25T14:54:32.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "tidal deformability",
      "normal nuclear matter density",
      "maximum star-mass constraint",
      "compact star matter-in",
      "conformal sound velocity"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}