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Quark star EOSs in the light of SGRBs and GW170817

  题目:Quark star EOSs in the light of SGRBs and GW170817 

  报告人:厦门大学 李昂教授 

  个人简介:李昂于2002年本科毕业于兰州大学, 2007年在兰州大学获得理论物理博士学位, 现为厦门大学天文学系教授和博士生导师,入选“福建省高等学校新世纪优秀人才支持计划”。先后在意大利国家核物理研究院南方实验室(INFN-LNS)、美国德克萨斯A&M大学康莫斯分校、意大利卡塔尼亚大学、美国内华达大学拉斯维加分校(UNLV)做访问学者。于2012-2013年担任日本理化学研究所(RIKEN)国际特别研究员, 并于2010年起主持国家自然科学基金多项。主要研究方向为中子星致密物质状态方程及相关天文现象(如脉冲星周期跃变、双星并合、短伽玛暴、暗物质混杂星)。发表SCI论文40余篇,h因子18,作为第一作者或通讯作者发展夸克层次符合核实验和天文限制的状态方程,被LIGO/Virgo合作组及eXTP卫星及Astro2020白皮书数次代表性引用,受邀撰写中英文综述文章。  

  摘要:The uncertain equation of state (EOS) of compact star plays a crucial role in the present multimessenger, multiscale astronomy. In one of the most widely-used quark star EOS models, the star properties can be characterized by the strange quark mass, an effective bag constant, the perturbative QCD corrections, as well as the gap parameter when considering quark pairing. From the constraint of SGRB observations with internal plateaus, we construct three new quark star EOSs (PMQS1, PMQS2, PMQS3) in the model for the central engine study of SGRB (1706.04720, 1606.02934). From the tidal deformability observation of the merging objects in GW170817, we provide new ranges for the model parameters and the current tidal deformability measurement implies MTOV<2.18 times the solar mass (2.32 when pairing is considered) for quark stars. We demonstrate that GW170817 has the possibility of originating from a binary quark star merger and the model has the possibility to rule out the existence of normal quark stars with future gravitational wave observations and mass measurements (1711.04312).  

  时间:1023日下午3 

  地点:3号楼302会议室

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紫金山天文台学术委员会 

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