Bombaci I, Drago A, Logoteta D, Pagliara G, Vidaña I
Dipartimento di Fisica "Enrico Fermi", Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy.
INFN Sezione di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy.
Phys Rev Lett. 2021 Apr 23;126(16):162702. doi: 10.1103/PhysRevLett.126.162702.
We investigate the possibility that the low mass companion of the black hole in the source of GW190814 was a strange quark star. This possibility is viable within the so-called two-families scenario in which neutron stars and strange quark stars coexist. Strange quark stars can reach the mass range indicated by GW190814, M∼(2.5-2.67) M_{⊙} due to a large value of the adiabatic index, without the need for a velocity of sound close to the causal limit. Neutron stars (actually hyperonic stars in the two-families scenario) can instead fulfill the presently available astrophysical and nuclear physics constraints which require a softer equation of state. In this scheme it is possible to satisfy both the request of very large stellar masses and of small radii while using totally realistic and physically motivated equations of state. Moreover it is possible to get a radius for a 1.4 M_{⊙} star of the order or less than 11 km, which is impossible if only one family of compact stars exists.
我们研究了GW190814源中黑洞的低质量伴星是奇异夸克星的可能性。在所谓的双族情景中，这种可能性是可行的，在该情景中，中子星和奇异夸克星共存。由于绝热指数的值很大，奇异夸克星可以达到GW190814所指示的质量范围，M∼(2.5 - 2.67)M⊙，而无需声速接近因果极限。相反，中子星（实际上在双族情景中是超子星）可以满足目前可用的天体物理和核物理约束，这些约束要求更软的状态方程。在这个方案中，在使用完全现实且具有物理动机的状态方程的同时，有可能满足非常大的恒星质量和小半径的要求。此外，对于一颗1.4M⊙的恒星，可以得到一个半径为11千米或更小的量级，如果只存在一类致密星，这是不可能的。
