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Nuclear Theory·nucl-th

Wednesday·November 28, 2018

7 papers—5 primary·2 cross-listed

All7Primary5Cross-lists2
  1. 06

    [Submitted on 26 Nov 2018] (cross-list from hep-th)

    Quark-hadron continuity beyond Ginzburg-Landau paradigm

    Yuji Hirono🇰🇷 · Yuya Tanizaki🇺🇸

    Quark-hadron continuity is a scenario that hadronic matter is continuously connected to color superconductor without phase transitions as the baryon chemical potential increases. This scenario is based on Landau's classification of phases since they have the same symmetry breaking pattern. We address the question whether this continuity is true as quantum phases of matter, which requires the treatment beyond Ginzburg-Landau description. To examine the topological nature of color superconductor, we derive a dual effective theory for Nambu-Goldstone (NG) bosons and vortices of the color-flavor locked phase, and discuss the fate of emergent higher-form symmetries. The theory has the form of a topological theory coupled to NG bosons, and fractional statistics of test quarks and vortices arises as a result of an emergent two-form symmetry. We find that this symmetry cannot be spontaneously broken, indicating that quark-hadron continuity is still a consistent scenario.

    Comments:
    6 pages; (v2) added some detailed explanations, refs updated; (v3) refs updated
    Subjects:
    High Energy Physics — Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1811.10608 [pdf]
    PRL(2019)·57 citations
  2. 07

    [Submitted on 27 Nov 2018] (cross-list from astro-ph.HE)

    Constraining twin stars with GW170817

    Gloria Montana🇪🇸 · Laura Tolos🇩🇪 · Matthias Hanauske🇩🇪 · Luciano Rezzolla🇩🇪

    If a phase transition is allowed to take place in the core of a compact star, a new stable branch of equilibrium configurations can appear, providing solutions with the same mass as the purely hadronic branch and hence giving rise to twin-star configurations. We perform an extensive analysis of the features of the phase transition leading twin-star configurations and, at the same time, fulfilling the constraints coming from the maximum mass of and the information following gravitational-wave event GW170817. In particular, we use a general equation of state for the neutron-star matter that parametrizes the hadron-quark phase transition between the model describing the hadronic phase and a constant speed of sound for the quark phase. We find that the largest number of twin-star solutions has masses in the neutron-star branch in the range and twin-branch masses . The analysis of the masses, radii and tidal deformabilities also reveals that when twin stars appear, the tidal deformability shows two distinct branches with the same mass, thus differing considerably from the behaviour expected for neutron stars. In addition, we find that the data from GW170817 is compatible with the existence of hybrid stars and could also be interpreted as produced by the merger of a binary system of hybrid stars or of a hybrid star with a neutron star. The presence of a hybrid star in the inspiral phase can be established clearly if future gravitational-wave detections measure chirp masses and tidal deformabilities of for stars. Finally, combining all observational information available, we set constraints on the parameters that characterise the phase transition, the maximum masses, and the radii of stars described by equations of state leading to twin-star configurations.

    Comments:
    17 pages, 12 figures, 2 tables
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    1811.10929 [pdf]
    PRD(2019)·203 citations

Affiliations

first authorsco-authorsvia INSPIRE