Topology change, emergent symmetries and compact star matter

Abstract

Topology effects have being extensively studied and confirmed in strongly correlated condensed matter physics. In the large color number limit of QCD, baryons can be regarded as topological objects -- skyrmions -- and the baryonic matter can be regarded as a skyrmion matter. We review in this paper the generalized effective field theory for dense compact-star matter constructed with the robust inputs obtained from the skyrmion approach to dense nuclear matter, relying to possible ``emergent" scale and local flavor symmetries at high density. All nuclear matter properties from the saturation density $n_0$ up to several times $n_0$ can be fairly well described. A uniquely novel -- and unorthdox -- feature of this theory is the precocious appearance of the pseudo-conformal sound velocity $v_s^2/c^2\approx 1/3$, with the non-vanishing trace of the energy momentum tensor of the system. The topology change encoded in the density scaling of low energy constants is interpreted as the quark-hadron continuity in the sense of Cheshire Cat Principle (CCP) at density $\gsim 2n_0$ in accessing massive compact stars. We confront the approach with the data from GW170817 and GW190425.

Version published in AAPPS Bulletin

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Cited by in corpus (6)

• Can the PREX-2 and CREX results be understood by relativistic mean-field models with the astrophysical constraints?
• Impact of massive neutron star radii on the nature of phase transitions in dense matter
• Topology and emergent symmetries in dense compact star matter
• Composition of scalar mesons and their effects on nuclear matter properties in an extended linear sigma model
• Novel features of asymmetric nuclear matter from terrestrial experiments and astrophysical observations of neutron stars
• Mapping topology of skyrmions and fractional quantum Hall droplets to nuclear EFT for ultra-dense baryonic matter