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Abstract:
Motivated by recent observations of compact binary gravitational wave events reported by LIGO/Virgo/KAGRA, we review the basics of dark and hybrid stars (here “hybrid stars” means “dark-matter admixed stars”, though this term usually refers to compact stars that compose of both hadronic and quark matter) and examine their probabilities as mimickers for black holes and neutron stars. We aim to survey this exciting topic and offer the necessary tools for the research study at the introductory level. Some results are newly derived, such as the equations of state for specific dark star models and the scaling symmetry for the Tidal Love number.
For neutron stars, there exist universal relations insensitive to the equation of states, the so called I-Love-Q relations, which show the connections among the moment of inertia, tidal Love number and quadrupole moment. We show that these relations also apply to dark stars, bosonic or fermionic. The relations can be extended to higher ranges of the variables, clarifying the deviations for dark stars in the literature, as those curves all approximate the ones generated by a polytropic equation of state, when taking the low density (pressure) limit. Besides, we find that for equation of states with scaling symmetries, the I-Love-Q curves do not change when adjusting the scaling parameters.
Biography:
张弘，本科毕业于清华大学工程物理系，硕士、博士毕业于(日本)东京大学物理系。先后在(日本)中央大学、(韩国)西江大学、中国科学院理论物理研究所及台湾师范大学进行博士后研究工作。2021年3月加入上海大学任副教授。研究围绕基础引力理论：一方面从理论角度，研究作为量子引力理论最有力候补的超弦理论，另一方面从实际出发，利用近年引力波的观测数据来检验修正天体与粒子模型。具体在AGT猜想(规范场论/共形场论对偶)的证明与推广、量子代数与可积性、解释并预测引力波观测事件等一系列前沿问题上进行了开拓。
Alternative online link: https://meeting.tencent.com/dm/bzq8epGIbBvN
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