题 目：Polarization-Pulse Structure of Neutron Star X-ray Signals from Dark Sector Physics
报告人：Lingfeng Li 博士后
时 间：2026年3月10号（星期二）上午10：30
地 点：物理学院LE201
邀请人：边立功
报告摘要：Neutron stars (NS's) with their strong magnetic fields and hot dense cores could be powerful probes of axions, a classic benchmark of feebly-coupled new particles, through abundant production of axions with the axion-nucleon coupling and subsequent conversion into X-rays due to the axion-photon coupling. In this article, we point out that the pulsation structures in both the intensity and polarization of X-rays from NS's could provide us additional information about axions and their couplings. We develop new analytical formalisms of pulsation-polarization structure applicable to a wide range of NS's in the axion scenario and argue that they hold in complicated astrophysical environments. As a case study, we apply our formalism to a representative X-ray Dim Isolated Neutron Star, RX J1856.6-3754, with an unexpected hard X-ray excess which might be axion-induced.
Lingfeng Li graduated from Peking University in 2013 and received his PhD in Theoretical High Energy Physics from the University of California, Davis in 2018 under the supervision of Prof. Hsin-Chia Cheng. Then he worked at HKUST and Brown University as a Postdoctoral Researcher. He is interested in precision tests of the Standard Model and probing new physics with new models, methods, and mindsets.