活动名称：Scalar wave dark matter imprints on binary black hole mergers: dependence on field mass and density

时间：2026年9月20日（星期日）时间点10:40

地点：博雅楼 503

主讲人：张玉鹏

主办单位：重庆师范大学物理与光电工程学院

主讲人简介：张玉鹏，兰州大学物理学院青年研究员、博士生导师，主要从事引力波与数值相对论、黑洞及玻色星物理研究，重点关注玻色星、标量毛黑洞和标量云环境下双黑洞的动力学。基于数值相对论与动态时空测地线方法，揭示玻色星塌缩和迁移中的轨道响应及黑洞阴影形成机制；通过全非线性演化研究黑洞动态标量化、轴子毛形成及超辐射不稳定性；发现高密度标量环境可加速双黑洞并合，并产生近千公里每秒的反冲速度。已在PRD、PRR、JHEP、EPJC等期刊发表SCI论文40余篇。主持国家自然科学基金面上项目、青年项目（C类）及中国博士后科学基金项目，参与国家重点研发计划引力波专项。

活动简介：Dark matter is supported by a wide range of evidence, including galaxy rotation curves, gravitational lensing, and cosmological observations, yet its microscopic nature remains unknown. Gravitational waves provide a new probe of the strong-gravity environments around black holes, while ultralight scalar fields, with their macroscopic wave nature, can form dense dark-matter structures around isolated and binary black holes. Using numerical relativity, we study binary black hole mergers in scalar dark-matter environments and examine the effects of black hole mass ratio, scalar-field mass, and initial density on the orbital evolution, gravitational-wave emission, and merger remnant. We find that scalar fields can significantly modify the inspiral and merger dynamics and alter the effective mass ratio through differential accretion. The scalar-field mass also affects field propagation and localization, as well as the transport of energy, angular momentum, and linear momentum. For unequal-mass binaries, scalar fields can strongly enhance or suppress the final recoil velocity. These results provide a theoretical basis for constraining scalar dark-matter environments and the properties of ultralight bosons with future ground- and space-based gravitational-wave observations.