Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 16: Heavy-Ion Collisions and QCD Phases IV

HK 16.1: Group Report

Tuesday, March 31, 2020, 17:00–17:30, J-HS G

Cold, dense quark matter and quark-hadron continuity in neutron stars — •Yifan Song — Physics Department, Technical University of Munich, 85748 Garching b. Munich, James-Franck-Str. 1, Germany

Recent discoveries of record-breaking massive neutron stars indicate their core density could reach up to five times nuclear matter saturation density, where the matter could begin to be properly described by quark matter. State-of-the-art equation of state studies using phenomenological quark models constrained by neutron star observations strongly suggest a continuous, smooth crossover from hadronic matter to quark matter, possibly with no first-order phase transitions. In this talk I show how such quark-hadron continuity can be manifestly realized in several aspects: 1. the continuity of spectrum of low-lying Nambu-Goldstone modes resulting from spontaneous chiral symmetry breaking by coexisting chiral and diquark condensates can be demonstrated using a schematic Nambu-Jona-Lasinio type model; 2. the explicit mapping between fermion and boson degrees of freedom in hadronic and quark matter can be established by a gauge-invariant description of QCD via field redefinition in the presence of diquark pairing; 3. the massive diquark-dressed gluons could be used to explain the strong vector correlations (implied by equation of state studies) between quarks, potentially bridging the non-perturbative gluon dynamics to phenomenological vector boson exchanges in such models.

This work is supported by the DFG Excellence Cluster "Origins".