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Nuclear Theory·nucl-th

Wednesday·October 26, 2022

4 papers—1 primary·3 cross-listed

All4Primary1Cross-lists3
  1. 02

    [Submitted on 24 Oct 2022] (cross-list from gr-qc)

    Exotic Compact Objects with Two Dark Matter Fluids

    Marie Cassing🇩🇪 · Alexander Brisebois🇨🇦 · Muhammad Azeem🇨🇦 · Jürgen Schaffner-Bielich🇩🇪

    The generic properties of compact objects made of two different fluids of dark matter are studied in a scale invariant approach. We investigate compact objects with a core-shell structure, where the two fluids are separated, and with mixed dark matter components, where both dark matter fluids are immersed within each other. The constellations considered are combinations of incompressible fluids, free and interacting Fermi gases, and equations of state with a vacuum term, i.e. self-bound dark matter. We find novel features in the mass-radius relations for combined dark matter compact objects which distinguishes them from compact objects with a single dark matter fluid and compact stars made of ordinary baryonic matter, as white dwarfs, neutron stars and quark stars. The maximum compactness of certain combined dark matter stars can reach values up to the causality limit for compact stars but not beyond that limit if causality of the dark matter fluids is ensured.

    Comments:
    11 pages, 13 figures, discussions extended
    Subjects:
    General Relativity and Quantum Cosmology (gr-qc); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2210.13697 [pdf]
    ApJ(2023)·26 citations
  2. 03

    [Submitted on 22 Oct 2022] (cross-list from hep-ph)

    Study of Differential Scattering Cross-section using Yukawa term of medium-modified Cornell potential

    Siddhartha Solanki🇮🇳 · Manohar Lal🇮🇳 · Vineet Kumar Agotiya🇮🇳

    In the present work we have studied the Differential Scattering Cross-section for ground states of charmonium and bottomonium in the frame work of the medium modified form of quark-antiquark potential and Born-approximation using the non-relativistic quantum chromo-dynamics approach. To reach this end, quasi-particle (QP) Debye mass depending upon baryonic chemical potential (b) and temperature has been employed and hence the variation of Differential Scattering Cross-section with baryonic chemical potential and temperature at fixed value of the scattering angle () has been studied. The variation of Differential Scattering Cross-section with scattering angle (in degree) at fixed temperature and baryonic chemical potential has also been studied. We have also studied the effect of impact parameter and transverse momentum on differential scattering cross-section at .

    Comments:
    13 pages, 8 figures (Accepted in advances in High Energy Physics Journal)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2210.13698 [pdf]
    Adv.High Energy Phys.(2022)·7 citations
  3. 04

    [Submitted on 25 Oct 2022] (cross-list from astro-ph.HE)

    Crustal failure as a tool to probe hybrid stars

    Jonas P. Pereira🇵🇱 · Michał Bejger🇮🇹 · Paweł Haensel🇵🇱 · Julian Leszek Zdunik🇵🇱

    It is currently unknown if neutron stars (NSs) are composed of nucleons only or are hybrid stars, i.e., in addition to nucleonic crusts and outer cores, they also possess quark cores. Quantum chromodynamics allows for such a possibility, but accurate calculations relevant for compact stars are still elusive. Here we investigate some crust-breaking aspects of hybrid stars. We show that the crust-breaking frequency and maximum fiducial ellipticity are sensitive to the quark-hadron density jump and equation of state stiffness. Remarkably, the crust-breaking frequency related to static tides scales linearly with the mass of the star (for a given companion's mass), and its slope encompasses information about the microphysics of the star. However, for precise crust-breaking frequency predictions, relativistic corrections to Kepler's third law and the Newtonian tidal field should not be ignored. When a liquid quark core touches an elastic hadronic phase (the result of a significant energy-density jump), the maximum ellipticity can increase around an order of magnitude when compared to a liquid quark core touching a liquid hadronic phase. That is relevant because it would increase the odds of detecting continuous gravitational waves from NSs. Our order-of-magnitude analysis also suggests that a given upper limit to the ellipticity(crust-breaking frequency) could have representatives in stars with either small or intermediate(large) energy-density jumps. Therefore, when upper limits to the ellipticity for isolated stars are better constrained or electromagnetic radiation (e.g., gamma-ray precursors) is detected along with gravitational waves in inspiraling binary systems, they may help constrain some aspects of phase transitions in NSs.

    Comments:
    12 pages, 6 figures. Improved discussions on boundary conditions, maximum fiducial ellipticities, crust-breaking frequencies, error estimation due to relativistic corrections to some Newtonian quantities used (orbital frequency and tidal field). Accepted for publication in ApJ
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2210.14048 [pdf]
    ApJ(2023)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE