Quasinormal g modes of neutron stars with quarks

被引:17
作者
Zhao, Tianqi [1 ]
Constantinou, Constantinos [2 ,3 ]
Jaikumar, Prashanth [4 ]
Prakash, Madappa [1 ]
机构
[1] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA
[2] Trento Inst Fundamental Phys & Applicat, INFN TIFPA, I-38123 Povo, TN, Italy
[3] European Ctr Theoret Studies Nucl Phys & Related, I-38123 Villazzano, TN, Italy
[4] Calif State Univ Long Beach, Dept Phys & Astron, Long Beach, CA 90840 USA
基金
美国国家科学基金会;
关键词
GRAVITATIONAL-RADIATION; OSCILLATIONS; EQUATION; INSTABILITY; EXCITATION;
D O I
10.1103/PhysRevD.105.103025
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Quasinormal oscillation modes of neutron stars provide a means to probe their interior composition using gravitational wave astronomy. We compute the frequencies and damping times of compositiondependent core g-modes of neutron stars containing quark matter employing linearized perturbative equations of general relativity. We find that ignoring background metric perturbations due to the oscillating fluid, as in the Cowling approximation, underestimates the g-mode frequency by up to 10% for higher mass stars, depending on the parameters of the nuclear equation of state and how the mixed phase is constructed. The g-mode frequencies are well described by a linear scaling with the central lepton (or combined lepton and quark) fraction for nucleonic (hybrid) stars. Our findings suggest that neutron stars with and without quarks are manifestly different with regards to their quasinormal g-mode spectrum, and may thus be distinguished from one another in future observations of gravitational waves from merging neutron stars.
引用
收藏
页数:15
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