Causal propagation of signals in strangeon matter  

作　　者：JiGuang Lu EnPing Zhou XiaoYu Lai RenXin Xu 

机构地区：[1]CAS Key Laboratory of FAST,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China [2]Key Laboratory of Radio Astronomy,Chinese Academy of Sciences,Beijing 100012,China [3]School of Physics and State Key Laboratory of Nuclear Science and Technology,Peking University,Beijing 100871,China [4]School of Physics and Mechanical&Electrical Engineering,Hubei University of Education,Wuhan 430205,China [5]Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China [6]Kavil Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2018年第8期82-88,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2017YFA0402600);the National Natural Science Foundation of China(Grant No.11225314);the Open Project Program of the Key Laboratory of Radio Astronomy and the Open Project Program of the Key Laboratory of FAST,NAOC,Chinese Academy of Sciences;The FAST FELLOWSHIP is supported by Special Funding for Advanced Users,budgeted and administrated by Center for Astronomical Mega-Science,Chinese Academy of Sciences(CAMS)

摘　　要：The state equation for strangeon matter is very stiff due to the non-relativistic nature of its particles and their repulsive interaction, such that pulsar masses as high as ～ 3M would be expected. However, an adiabatic sound speed, cs = √P/ρ, is usually superluminal in strangeon matter, and the dynamic response of a strangeon star （e.g., binary merger） is not tractable in numerical simulations. In this study, we examined signal propagation in strangeon matter and calculate the actual propagation speed, Csignal. We found that the causality condition, Csignal 〈 c, is satisfied and the signal speed is presented as a function of stellar radius.The state equation for strangeon matter is very stiff due to the non-relativistic nature of its particles and their repulsive interaction,such that pulsar masses as high as～3 M_⊙ would be expected. However, an adiabatic sound speed, c_s=(?P/?ρ)～(1/2), is usually superluminal in strangeon matter, and the dynamic response of a strangeon star(e.g., binary merger) is not tractable in numerical simulations. In this study, we examined signal propagation in strangeon matter and calculate the actual propagation speed, c_(signal).We found that the causality condition, c_(signal)< c, is satisfied and the signal speed is presented as a function of stellar radius.

关 键 词：equations of state of neutron-star matter acoustic signal processing control theory 

分 类 号：P145.6[天文地球—天体物理]