报告题目:Polarization-Pulse Structure of Neutron Star X-ray Signals from Dark Sector Physics

报告人：Lingfeng Li

报告时间：2025年12月12日(周五)上午 10:00-11:30

报告地点：浙江工业大学理学楼 二楼师生活动中心

摘要（Abstract）：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 m 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.We show with an updated fit that the axion explanation is compatible with both the intensity and pulsation data available, and combining the pulsation data does not shift the posterior by more than l sigma, Yet, the preferred parameter space is close to being excluded by other astrophysical constraints. With a 75%reduction of the uncertainties in the pulsation data, we could potentially draw a definite conclusion on the axion-induced X-rays at more than 3 sigma level.

报告人简介(Bio)：Lingfeng Li graduated from Peking University in 2013 and received his PhD in Theoretical High Energy Physics from University of Califomia, Davis in 201 8Then 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. His study covers particle physics and cosmology

邀请人：朱涛