TY  - JOUR
A1  - Fu, Han Rui
A1  - Li, Jia Jie
A1  - Sedrakian, Armen
A1  - Weber, Fridolin
T1  - Massive relativistic compact stars from SU(3) symmetric quark models
T2  - Physics Letters B
N2  - We construct a set of hyperonic equations of state (EoS) by assuming SU(3) symmetry within the baryon octet and by using a covariant density functional (CDF) theory approach. The low-density regions of our EoS are constrained by terrestrial experiments, while the high-density regime is modeled by systematically varying the nuclear matter skewness coefficient Qsat and the symmetry energy slope Lsym. The sensitivity of the EoS predictions is explored in terms of z parameter of the SU(3) symmetric model that modifies the meson-hyperon coupling constants away from their SU(6) symmetric values. Our results show that model EoS based on our approach can support static Tolman-Oppenheimer-Volkof (TOV) masses in the range 2.3-2.5M⊙ in the large-Qsat and small-z regime, however, such stars contain only a trace amount of hyperons compared to SU(6) models. We also construct uniformly rotating Keplerian configurations for our model EoS for which the masses of stellar sequences may reach up to 3.0M⊙. These results are used to explore the systematic dependence of the ratio of maximum masses of rotating and static stars, the lower bound on the rotational frequency of the models that will allow secondary masses in the gravitational waves events to be compact stars with M2≲3.0M⊙ and the strangeness fraction on the model parameters. We conclude that very massive stellar models can be, in principle, constructed within the SU(3) symmetric model, however, they are nucleonic-like as their strangeness fraction drops below 3%.
KW  - Equation of state
KW  - Hyperonic stars
KW  - Rapid rotation
KW  - Gravitational wave events
Y1  - 2022
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/78450
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-784508
SN  - 0370-2693
VL  - 834
IS  - 137470
PB  - Elsevier
CY  - Amsterdam
ER  -