TY  - JOUR
A1  - Li, Jia Jie
A1  - Sedrakian, Armen
A1  - Weber, Fridolin
T1  - Rapidly rotating Δ-resonance-admixed hypernuclear compact stars
T2  - Physics letters B
N2  - We use a set of hadronic equations of state derived from covariant density functional theory to study the impact of their high-density behavior on the properties of rapidly rotating Δ-resonance-admixed hyperonic compact stars. In particular, we explore systematically the effects of variations of the bulk energy isoscalar skewness, Qsat, and the symmetry energy slope, Lsym, on the masses of rapidly rotating compact stars. With models for equation of state satisfying all the modern astrophysical constraints, excessively large gravitational masses of around 2.5M⊙ are only obtained under three conditions: (a) strongly attractive Δ-resonance potential in nuclear matter, (b) maximally fast (Keplerian) rotation, and (c) parameter ranges Qsat≳500 MeV and Lsym≲50 MeV. These values of Qsat and Lsym have a rather small overlap with a large sample (total of about 260) parametrizations of covariant nucleonic density functionals. The extreme nature of requirements (a)-(c) reinforces the theoretical expectation that the secondary object involved in the GW190814 event is likely to be a low-mass black hole rather than a supramassive neutron star.
KW  - Equation of state
KW  - Heavy baryons
KW  - Compact stars
KW  - Rapid rotation
KW  - Gravitational waves
Y1  - 2020
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/69866
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-698667
SN  - 1873-2445
SN  - 0370-2693
VL  - 810
IS  - 135812
PB  - Elsevier
CY  - Amsterdam
ER  -