期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到9,872篇文章
< 1 2 … 250 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Momentum transfer collision frequencies between electrons and neutrals of astrophysical interest 认领 引用
1
作者 YuTian Cao Jun Cui +4 位作者 RuiQi Fu WenJun Liang XiaoShu Wu TieLong Zhang HaoYu Lu 《Earth and Planetary Physics》 EI CSCD 2026年第1期82-91,共10页
Theoretical calculations serve as an effective method for determining plasma temperatures within planetary atmospheres.To simulate plasma temperature,a comprehensive implementation of the energy equation is used,which... Theoretical calculations serve as an effective method for determining plasma temperatures within planetary atmospheres.To simulate plasma temperature,a comprehensive implementation of the energy equation is used,which is governed by five terms:conductivity,heating,cooling,adiabatic expansion,and advection.The derivations mentioned are strongly dependent on the collision cross section between electrons and other particles(e.g.,neutrals,ions).It is notable that the momentum transfer cross sections between electrons and neutrals have been updated in recent decades.However,the widely used momentum average collision cross sections between electrons and neutrals,derived from the momentum transfer cross sections,are collected in studies dating back nearly half a century.Therefore,it becomes imperative to revise the momentum average collision cross sections relevant to astrophysical contexts,based on the latest studies.In this study,we summarize the momentum average collision cross sections of 13 species common in planetary atmospheres:H,H2,He,O,CH4,H2O,CO,N2,O2,Ar,CO2,N2O,and NO2.All results are derived from the latest studies concerning the electron-neutral collision cross section and are compared with previous studies.Furthermore,we present a comparison of the derived total electron-neutral collision frequency at Mars between this study and previous studies.Prominent differences in the total electron-neutral collision frequency between this and prior studies support the significance of updating the momentum average collision cross section between electrons and neutrals in studying the planetary atmospheres. 展开更多
关键词 momentum transfer collision planetary atmosphere electron-neutral collision frequency
暂未订购 下载PDF
核天体物理实验数据评价:现状与挑战 认领 引用
2
作者 南威克 柳卫平 陈洁 《物理学报》 SCIE EI CAS CSCD 北大核心 2026年第2期23-37,共15页
核反应率数据库是天体核合成与恒星演化建模的关键输入量,直接影响各类核天体物理过程的计算精度与物理可信度.近年来,高分辨4π探测器阵列、新型气体探测器、γ-带电粒子符合测量等先进实验技术在关键核天体物理反应研究中得到广泛应用... 核反应率数据库是天体核合成与恒星演化建模的关键输入量,直接影响各类核天体物理过程的计算精度与物理可信度.近年来,高分辨4π探测器阵列、新型气体探测器、γ-带电粒子符合测量等先进实验技术在关键核天体物理反应研究中得到广泛应用;同时,锦屏深地核天体物理实验平台等地下低本底设施也取得了一系列重要进展.这些新的低能区实验测量结果,相较于传统数据库依赖的经验外推或者理论计算,为关键核反应天体环境温度区间的热核反应率评估提供了更直接的约束,也为未来数据库的持续优化提供了新的实验支撑.本文系统回顾了当前主流核反应率数据库—REACLIB, STARLIB, BRUSLIB等的建库目标、数据结构与典型应用,梳理了它们在数据库覆盖、拟合方式与误差评价等方面的特征.这些数据库在推动核反应网络计算标准化进程中发挥了重要作用.在此基础上,结合当前核反应率数据库特点,在元数据存储结构、数据库更新,以及人员组织形式等方面提出若干方法,并强调了前沿实验进展对先进数据库构建的重要性. 展开更多
关键词 核天体物理 核反应率数据库 恒星核合成 地下实验
暂未订购 下载PDF
To Understand the Radiative Processes of Pulsars and Fast Radio Bursts with the FAST 认领 引用
3
作者 Wei-Yang Wang Shunshun Cao +39 位作者 Zhipeng Huang Jiguang Lu Yunpeng Men Lingqi Meng Jiarui Niu Zhichen Pan Pengfei Wang Dejiang Zhou Yi Feng Jinlin Han Jinchen Jiang Bin Liu Rui Luo Hongguang Wang Shuangqiang Wang Tao Wang Zhengli Wang Heng Xu Jiangwei Xu Renxin Xu Yonghua Xu Yi Yan Zhen Yan Yukai Zhou Siyuan Chen Yinfeng Dai Mingyu Ge Zejun Jiang Kejia Lee Yujie Lian Kuo Liu Lei Qian Hao Tong Lin Wang Yujie Wang Zihao Xu Jumei Yao Dejiang Yin Li Zhang Weiwei Zhu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第5期431-460,共30页
The radiative mechanism of coherent radio emission has remained an enigma since the discovery of pulsars,even with the emergence of fast radio bursts(FRBs),which exhibit similarities to the single-pulse behavior of pu... The radiative mechanism of coherent radio emission has remained an enigma since the discovery of pulsars,even with the emergence of fast radio bursts(FRBs),which exhibit similarities to the single-pulse behavior of pulsars and have opened a new window for deciphering this long-standing mystery.Besides tremendous efforts in modeling,advanced facilities are essential for solving the problem.The authors review the observational breakthroughs made with the Five-hundred-meter Aperture Spherical Radio Telescope(FAST),which are providing pivotal insights into the underlying physics of pulsars and FRBs.This study offers a novel perspective in the era when pulsars meet FRBs,and further investigations are encouraged to utilize the high sensitivity of FAST. 展开更多
关键词 observational breakthroughs Five hundred meter aperture spherical radio telescope FAST coherent radio emission fast radio bursts frbs which fast radio bursts pulsars radiative mechanism
暂未订购 下载PDF
Multiparameter hierarchical sensitivity analysis of tilt-to-length coupling noise in Taiji science interferometer 认领 引用
4
作者 Fei Xie Xiaodong Peng +2 位作者 Wenlin Tang Mengyuan Zhao Xiaoshan Ma 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第1期399-408,共10页
Tilt-to-length(TTL)coupling noise is a critical issue in space-based gravitational wave detection due to its complex dependence on multiple interacting factors,which complicates the identification of dominant paramete... Tilt-to-length(TTL)coupling noise is a critical issue in space-based gravitational wave detection due to its complex dependence on multiple interacting factors,which complicates the identification of dominant parameters.To address this challenge,we develop a simulation model of the Taiji scientific interferometer,generating noise datasets under multiparameter conditions.Given the uniqueness of the telescope as well as the convergence behavior of the algorithm,the analysis is structured hierarchically:(i)the telescope level and(ii)the optical bench level.A hierarchical framework combining XGBoost and SHapley Additive exPlanations(SHAP)values is employed to model the intricate relationships between parameters and TTL coupling noise,supplemented by sensitivity analysis.Our results identify pointing jitter and telescope radius as the dominant parameters at the telescope level,while the angles of the plane mirrors and beam splitters are most influential at the optical bench level.The parameter space is reduced from 86 dimensions to 14 dimensions without sacrificing model accuracy.This approach offers actionable insights for optimizing the Taiji interferometer design. 展开更多
关键词 space-based gravitational wave detection intrasatellite science interferometer tilt-to-length coupling noise sensitivity analysis
暂未订购 下载PDF
Probing AGN Disks Density Profiles through Gravitational Wave Observations 认领 引用
5
作者 Xiangyu Lyu En-Kun Li +1 位作者 Changfu Shi Yi-Ming Hu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第6期177-181,共5页
Massive black holes surrounded by a gaseous disk have been a prevailing model to explain a wide spectrum of astrophysical phenome-na related to active galactic nuclei(AGNs).However,direct and precise measurements of t... Massive black holes surrounded by a gaseous disk have been a prevailing model to explain a wide spectrum of astrophysical phenome-na related to active galactic nuclei(AGNs).However,direct and precise measurements of the disk density profiles remain elusive for current telescopes.In this work,we demonstrate that it is possible to pinpoint the gas density if an inspiralling stellar mass binary black hole is embedded in the AGN disk.Furthermore,if the barycenter of the pair follows an eccentric orbit around an AGN,then space-borne gravitational wave detectors can measure the density of the surrounding disk with multi-year observations by tracking the gravitational wave evolution.The error between the inferred density profile and the injected truth can be constrained to below 2×10-11 g/cm3.Our work opens up an exciting new channel to investigate the very center of galaxies,where disk gas density distributionsρ(r)can be recovered by analyzing time-dependent environmental imprints in gravitational waveforms. 展开更多
关键词 inspiralling stellar mass binary black hole pinpoint gas density black holes massive black holes gaseous disk density profiles active galactic nuclei agns howeverdirect gravitational waves
暂未订购 下载PDF
动态吸脱附效应对空间引力波惯性传感器残余气体噪声的影响 认领 引用
6
作者 张俊 王朋 +3 位作者 李冬辉 翁磊 欧阳智 王旭迪 《真空科学与技术学报》 CAS CSCD 北大核心 2026年第6期519-524,共6页
残余气体噪声是限制空间引力波惯性传感器测量精度的重要因素,对空间引力波探测至关重要。空间引力波惯性传感器在轨运行时残余气体主要为氢气和水分子,研究难点在于水分子残余噪声的评估。水分子在金属表面滞留时间跨度长,可达10−3s... 残余气体噪声是限制空间引力波惯性传感器测量精度的重要因素,对空间引力波探测至关重要。空间引力波惯性传感器在轨运行时残余气体主要为氢气和水分子,研究难点在于水分子残余噪声的评估。水分子在金属表面滞留时间跨度长,可达10−3s到105 s,使得其施加在测试质量上的冲量间隔拉长,对0.1 mHz到100 mHz低频引力波信号产生干扰,即水分子的动态吸脱附效应。研究建立了针对水分子动态吸脱附效应的残余气体噪声理论模型,分析了动态吸脱附效应的作用机理。结果表明,水分子残余气体噪声是氢气分子的1.73倍,可使残余气体噪声超出1×10−15(m·s−2/Hz1/2)的阈值。水分子动态吸脱附效应受吸−脱附参数ka、kd控制。吸附参数ka则对水分子与探测器间的动量交换有“缓冲”作用,可减小噪声,脱附参数kd则相反。研究结果对准确评估空间引力波惯性传感器在轨噪声具有意义。 展开更多
关键词 动态吸脱附效应 残余气体噪声 空间引力波探测 惯性传感器
暂未订购 下载PDF
Effects of minimally coupled modified gravity on the gravitational collapse of compact matter structures 认领 引用
7
作者 M Yousaf A Rehman +2 位作者 M M M Nasir S Hanif H Asad 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第2期134-162,共29页
Our analysis is particularly motivated by its relevance to understanding compact object instabilities,gravitational collapse thresholds,and the formation of dense structures under the influence of modified gravity the... Our analysis is particularly motivated by its relevance to understanding compact object instabilities,gravitational collapse thresholds,and the formation of dense structures under the influence of modified gravity theories.The interplay of anisotropic pressures,perturbative dynamics,and modified gravity contributions offers insight into both the stable configuration of dense fluids and the mechanisms leading to dynamical instability.Such considerations directly contribute to the aims of high energy density profiles,particularly in modeling physical systems where extreme pressure,curvature,and matter interactions co-exist.We consider an axially symmetric,dense structure with anisotropic matter content and employ a specific equation of state(EoS)to examine the interplay between static and dynamic quantities via the adiabatic index.To address the complex dynamics of the collapse process,a perturbative scheme is utilized under Newtonian and post-Newtonian approximations,enabling a detailed examination of the stability and structural evolution of the system under the influence of the considered minimally coupled gravity.Our results demonstrate that hydrostatic equilibrium is maintained when effective pressure,gravitational,and anti-gravitational forces are balanced,while deviations from this balance initiate dynamical instability.Graphical representations of stable and unstable regimes are presented,revealing how the choice of gravity functions significantly affects the outcome.This work provides insight into the behavior of dense,self-gravitating configurations under modified gravity,offering broader implications for the modeling of compact astrophysical objects and contributing to the understanding of gravitational collapse in energy density regimes. 展开更多
关键词 modified theory gravitational collapse dynamical behavior Newtonian post-Newtonian
暂未订购 下载PDF
The Formation of Electron-capture Supernovae:A Review 认领 引用
8
作者 Bo Wang Dongdong Liu +1 位作者 Yunlang Guo Zhanwen Han 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第3期1-14,共14页
It is generally believed that the electron-capture reactions happen when the oxygen-neon(ONe)cores grow in masses close to the Chandrasekhar limit,leading to the formation of neutron stars(NSs)via electron-capture sup... It is generally believed that the electron-capture reactions happen when the oxygen-neon(ONe)cores grow in masses close to the Chandrasekhar limit,leading to the formation of neutron stars(NSs)via electron-capture supernovae(EC-SNe).EC-SNe are predicted to be the most likely short-lived and faint optical transients,and a small ejecta mass is expected during the collapse.This kind of SNe provide a distinct channel for producing isolated NSs and NS systems,especially for the formation of X-ray binaries and double NSs.Although EC-SNe were proposed∼45 yr ago,there are still some uncertainties for the origin of EC-SNe and their productions.In this article,we review recent studies on the two classic progenitor channels of EC-SNe,i.e.,the single star channel and the binary channel.In the single star channel,EC-SNe can happen in super asymptotic giant branch stars or He stars,whereas in the binary channel EC-SNe can occur in He stars in binaries(involving He star+MS systems and NS+He star systems)or accretion-induced collapse in white dwarf binaries(involving the singledegenerate scenario and the double-degenerate scenario).Recent progress on these two progenitor channels is discussed,including the initial parameter range for EC-SNe,the evolutionary paths to EC-SNe,related objects and some observational constraints,etc.We also make some discussions on the possible candidates for EC-SNe in this article,and the impacts of EC-SNe on some research fields,e.g.,the properties of NSs,double NS population and chemical products,etc.It is noting that EC-SNe show some similar properties with ultra-stripped SNe,e.g.,low ejecta masses and small kicks.Accordingly,we also discuss the difference between these two types of SNe in this article.Research on EC-SNe is at a pivotal stage,with key theoretical uncertainties and observational challenges requiring integrated modeling and multi-wavelength observations for robust identification. 展开更多
关键词 stars evolution-(stars:)binaries general-(stars:)binaries(including multiple) close-(stars:)supernovae general
暂未订购 下载PDF
Thermodynamics of Einstein-Gauss-Bonnet black holes and ensemble-averaged theory 认领 引用
9
作者 Md Sabir Ali C Fairoos +2 位作者 C L Ahmed Rizwan T K Safir Peng Cheng 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第5期112-120,共9页
In this paper,using the ensemble-averaged theory,we define the thermodynamic free energy of Einstein-Gauss-Bonnet(EGB)black holes in anti-de Sitter(Ad S)spacetime.This approach derives the gravitational partition func... In this paper,using the ensemble-averaged theory,we define the thermodynamic free energy of Einstein-Gauss-Bonnet(EGB)black holes in anti-de Sitter(Ad S)spacetime.This approach derives the gravitational partition function by incorporating non-saddle geometries besides the classical solutions.Unlike the sharp transition points seen in free energy calculated via saddlepoint approximation,the ensemble-averaged free energy plotted against temperature shows a smoother behavior,suggesting that black hole phase transitions may be viewed as a small-GN(Newton's gravitational constant)limit of the ensemble theory.This is similar to the behavior of black hole solutions in Einstein's gravity theory in Ad S spacetime.We have obtained an expression for the quantum-corrected free energy for EGB-Ad S black holes,and in the sixdimensional case,we observe a well-defined local minimum after the transition temperature which was absent in the earlier analysis of the classical free energy landscape.Furthermore,we expand the ensemble-averaged free energy in powers of GNto identify non-classical contributions.Our findings indicate that the similarities in the thermodynamic behavior between five-dimensional EGB-Ad S and Reissner-Nordström-Ad S black holes,as well as between sixdimensional EGB-Ad S and Schwarzschild-Ad S black holes,extend beyond the classical regime. 展开更多
关键词 AdS black holes Einstain—Gauss—Bonnet gravity thermodynamics of black holes ensemble averaged theory higher dimensions
暂未订购 下载PDF
In-flight Trigger Classification Algorithm for GECAM-C 认领 引用
10
作者 Jia-Ciong Liu Shao-Lin Xiong +26 位作者 Yue Huang Xiao-Yun Zhao Chen-Wei Wang Xiang-Yang Wen Chao Zheng Wang-Chen Xue Yan-Qiu Zhang Wen-Jun Tan Yue Wang Jin-Peng Zhang Hao-Xuan Guo Yang-Zhao Ren Sheng-Lun Xie Peng Zhang Zheng-Hua An Ke Gong Xiao-Bo Li Xin-Qiao Li Ya-Qing Liu Xiao-Jing Liu Xiang Ma Rui Qiao Jin Wang Ping Wang Sheng Yang Da-Li Zhang Shi-Jie Zheng 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第4期221-227,共7页
As a member of the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM)constellation,GECAM-C is an all-sky gamma-ray monitor with in-flight trigger capability aboard the SATech-01 experime... As a member of the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM)constellation,GECAM-C is an all-sky gamma-ray monitor with in-flight trigger capability aboard the SATech-01 experimental satellite.Operating in a Sun-Synchronous Orbit,GECAM-C generates many in-flight triggers,some of which correspond to important astrophysical bursts,such as gamma-ray bursts and soft gamma-ray repeaters,which may require follow-up observations.However,there are also a substantial number of non-astrophysical triggers,such as particle events.Therefore,a prompt and accurate classification of in-flight triggers is essential for scientific research.In this work,we propose an automatic trigger classification algorithm for GECAM-C in-flight triggers with Bayesian inference.Applying this method to GECAM-C triggers from 2022 December to 2023 December,we demonstrate that it can successfully categorize all trigger types with an accuracy of about 95%,thereby providing effective support for rapid follow-up observations. 展开更多
关键词 instrumentation detectors-methods statistical-methods data analysis
暂未订购 下载PDF
An Artificial Pulsar-signal Generator for Pulsar Search 认领 引用
11
作者 Yun Yu Junhua Gu +6 位作者 Quan Guo Jun Yang Zurong Zhou Yue Hu Chengshi Zhao Peng Li Bixuan Zhao 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第4期260-272,共13页
Pulsars,which are spinning neutron stars emit regular pulses and are essential to time-domain radio astronomy.Numerous observatories concentrate on detecting and researching faint pulsar signals,especially at radio fr... Pulsars,which are spinning neutron stars emit regular pulses and are essential to time-domain radio astronomy.Numerous observatories concentrate on detecting and researching faint pulsar signals,especially at radio frequencies.To enable rapid system verification,optimization,and troubleshooting,we have devised a costeffective artificial pulsar signal generator utilizing an economical software-defined radio.These artificial signals are digitally synthesized with customizable parameters such as pulse period,dispersion measure,central frequency,bandwidth,sampling rate,pulse duration,and noise level.The central frequency can be set within 70 MHz-6 GHz,the instantaneous bandwidth up to 56 MHz,and the output power controlled via the gain setting,typically ranging from−20 to+10 dBm depending on frequency and gain.By incorporating frequency-dependent dispersion delays and Gaussian noise,these simulated signals can replicate the time and spectral features of actual pulsar emissions in a laboratory setting.Additionally,we performed single-dish experiments using the simulated pulsar signal and the 40 m radio telescope at Haoping Station,China.The resulting data were processed with standard pulsar signal analysis software.This demonstrates the signal generator’s precision in fulfilling system calibration and verification needs for pulsar observations.As an affordable and compact device,the pulsar signal simulator enables researchers to design and experiment with new-generation pulsar backends anywhere and at any time without relying on a strong pulsar source.Moreover,it offers astronomers the opportunity to engage in pulsar-related educational activities using a small antenna at frequencies<6 GHz. 展开更多
关键词 Astronomical Instrumentation,Methods and Techniques-(stars:)pulsars general-techniques image processing
暂未订购 下载PDF
Integrated N2-Ar measurements of trace extraterrestrial samples 认领 引用
12
作者 Fei Su XuHang Zhang +5 位作者 ChuanTong Zhang YouJuan Li ZiHeng Liu JianNan Li HeJiu Hui HuaiYu He 《Earth and Planetary Physics》 EI CSCD 2026年第1期22-29,共8页
As one of the major volatile components in extraterrestrial materials,nitrogen(N2)isotopes serve not only as tracers for the formation and evolution of the solar system,but also play a critical role in assessing pl... As one of the major volatile components in extraterrestrial materials,nitrogen(N2)isotopes serve not only as tracers for the formation and evolution of the solar system,but also play a critical role in assessing planetary habitability and the search for extraterrestrial life.The integrated measurement of N2and argon(Ar)isotopes by using noble gas mass spectrometry represents a state-of-the-art technique for such investigations.To support the growing demands of planetary science research in China,we have developed a high-efficiency,high-precision method for the integrated analysis of N2and Ar isotopes.This was achieved by enhancing gas extraction and purification systems and integrating them with a static noble gas mass spectrometer.This method enables integrated N2-Ar isotope measurements on submilligram samples,significantly improving sample utilization and reducing the impact of sample heterogeneity on volatile analysis.The system integrates CO2laser heating,a modular two-stage Zr-Al getter pump,and a CuO furnace-based purification process,effectively reducing background levels(N2blank as low as 0.35×10−6cubic centimeters at standard temperature and pressure[ccSTP]).Analytical precision is ensured through calibration with atmospheric air and CO corrections.To validate the reliability of the method,we performed N2-Ar isotope analyses on the Allende carbonaceous chondrite,one of the most extensively studied meteorites internationally.The measured N2concentrations range from 19.2 to 29.8 ppm,withδ15N values between−44.8‰and−33.0‰.Concentrations of 40Ar,36Ar,and 38Ar are(12.5-21.1)×10−6ccSTP/g,(90.9-150.3)×10−9ccSTP/g,and(19.2-30.7)×10−9ccSTP/g,respectively.These values correspond to cosmic-ray exposure ages of 4.5-5.7 Ma,consistent with previous reports.Step-heating experiments further reveal distinct release patterns of N and Ar isotopes,as well as their associations with specific mineral phases in the meteorite.In summary,the combined N2-Ar isotopic system offers significant advantages for tracing volatile sources in extraterrestrial materials and will provide essential analytical support for upcoming Chinese planetary missions,such as Tianwen-2. 展开更多
关键词 integrated N2-Ar measurement noble gas mass spectrometer extraterrestrial samples
暂未订购 下载PDF
High-order QED correction impacts on phase transition of the Euler-Heisenberg dS spacetime 认领 引用
13
作者 Shan-Xia Bao Meng-Sen Ma +1 位作者 Huai-Fan Li Yun-Zhi Du 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第5期121-131,共11页
Recent studies have demonstrated that AdS black holes possess the basic characteristics of a standard thermodynamic system. Concurrently, the thermodynamic properties of spacetimes featuring multiple horizons with dis... Recent studies have demonstrated that AdS black holes possess the basic characteristics of a standard thermodynamic system. Concurrently, the thermodynamic properties of spacetimes featuring multiple horizons with distinct radiation temperatures have also attracted research interest. In this work, considering the high-order quantum electrodynamics correction, we initially establish an equivalent thermodynamic system for the coexistence region of black hole and cosmological horizons. On this basis, we conduct a detailed investigation into the thermodynamic properties of this dual-horizon coexistence region. Our results demonstrate that this equivalent thermodynamic system exhibits van der Waals-like thermodynamic behavior. Furthermore, we introduce a nonlinear parameter γ to analyze its impact on phase transitions within the equivalent thermodynamic system. Under specific conditions, the system undergoes first-or second-order phase transitions for γ = 0, and zeroth-or second-order phase transitions for γ ≠ 0. Finally, by utilizing the generalized off-shell Helmholtz free energy within the thermodynamic topological framework for black holes, we extend this methodology to investigate the topological properties of de Sitter(d S) spacetime. We compute the topological number characterizing the coexistence region of dual horizons in Euler±Heisenberg d S spacetime using equivalent thermodynamic state parameters. Additionally, we investigate the influence of the nonlinear parameter γ on the thermodynamic characteristics of the equivalent system. 展开更多
关键词 EulerHeisenberg dS spacetime QED correction phase transition topology
暂未订购 下载PDF
From Detection to Host Galaxy Identification:Precision Continuous Gravitational Wave Localization with a Few Anchor Pulsars 认领 引用
14
作者 Chaofan Wen Yiqin Chen +2 位作者 Shiyi Zhao Hao Ding Xingjiang Zhu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第6期182-189,共8页
Pulsar Timing Arrays(PTAs)are rapidly advancing toward the detection of continuous gravitational waves from individual supermassive binary black holes.While it is well established that coherently utilizing the“pulsar... Pulsar Timing Arrays(PTAs)are rapidly advancing toward the detection of continuous gravitational waves from individual supermassive binary black holes.While it is well established that coherently utilizing the“pulsar term”requires astrometric distance uncertainties to be smaller than the gravitational wavelength,achieving this precision across an entire array is observationally prohibitive.Here,we demonstrate that achieving sub-wavelength precision for a few“anchor”pulsars is sufficient to phase-lock the array and drastically shrink the sky-localization error.Using 20 years of realistically simulated data,we systematically evaluate the localization performance of a 25-pulsar array containing three to six high-precision anchors.We show that while introducing three sub-wavelength anchors can reduce the 90%credible sky area by a factor of 30 in certain directions,expanding this high-precision subset to six anchor pulsars ensures high-precision localizations across diverse source directions.Evaluating a representative set of sky directions,including local galaxy clusters and the locations of maximum and minimum array sensitivity,this six-anchor configuration yields 90%credible localization areas ranging from~0.1 to 9.2 deg2 at a signal-to-noise ratio of 20.Furthermore,once this minimal subset crosses the sub-wavelength threshold,further reductions in distance uncertainty yield diminishing returns.This establishes a highly efficient near-term observational strategy:prioritizing intensive parallax campaigns for a small core of stable millisecond pulsars provides a cost-effective pathway to precision multi-messenger astronomy. 展开更多
关键词 detection continuous gravitational waves pulsar timing arrays localization anchor pulsars gravitational waves precision astrometry supermassive binary black holeswhile pulsar timing arrays ptas
暂未订购 下载PDF
In-Target Energy Loss Compensation for Nuclear Astrophysical Studies 认领 引用
15
作者 Huangkai Wu Kai Zhao +11 位作者 Youjing Wang Yixin Li Yisong Zhou Ding Yue Zhengkun Li Jize Tan Lisong Bai Weiping Liu Bing Guo Changbo Fu Guoqiang Zhang Yu-Gang Ma 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第3期1-9,共9页
Measuring cross sections of nuclear reactions,such as the so-called“Holy Grail”reaction,12C(σ,γ)16O,is essential for understanding stellar nucleosynthesis but presents significant challenges due to extremely... Measuring cross sections of nuclear reactions,such as the so-called“Holy Grail”reaction,12C(σ,γ)16O,is essential for understanding stellar nucleosynthesis but presents significant challenges due to extremely low cross sections.Key challenges include significant energy loss as ions penetrate the target material,limiting measurements to thin target layers.To overcome these obstacles,we propose a novel method,the in-target energy loss compensating(eLOC)method,specifically designed for gas targets,which utilizes a gas-filled magnetic field and accelerating electric fields to compensate for ion energy loss in the target.Simulations show that this approach significantly enhances the effective target thickness by over 140 times in the case of the“Holy Grail”reaction with an inverse-kinematics setup.This eLOC method may provide a powerful new tool for obtaining critical data in nuclear astrophysics,thereby advancing our understanding of stellar nucleosynthesis and the origins of elements in the universe,as well as benefiting other related fields such as isotope production. 展开更多
关键词 measuring cross sections nuclear astrophysics gas targets understanding stellar nucleosynthesis magnetic field target materiallimiting target energy loss compensation gas targetswhich
暂未订购 下载PDF
Improving the Accuracy of Pulsar Time-scale Confronting the Effect of Red Noises 认领 引用
16
作者 Meng-Jiao Xu Lin-Lin Wang +2 位作者 Zhe-Hao Zhang Yue Hu Ming-Lei Tong 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第4期211-220,共10页
The long-term stability of pulsar time(PT)is susceptible to the influence of red noise within timing residuals.Based on the first release data from the International Pulsar Timing Array,we apply a generalized least-sq... The long-term stability of pulsar time(PT)is susceptible to the influence of red noise within timing residuals.Based on the first release data from the International Pulsar Timing Array,we apply a generalized least-squares(GLS)solution based on the“Cholesky”method to process the red noise,thereby obtaining improved pulsar model parameters for timing residual forecasting.Through two distinct prediction schemes,we analyze the relative frequency deviation of the Terrestrial Time(TT)realisation based on PT(TT(PT)),compared to the TT provided by the Bureau International des Poids et Mesures.Results indicate that relative frequency deviations are significantly reduced following the GLS-processed red noise,with relative reductions ranging from 23%to 60%depending on the pulsar and forecasting scheme,effectively enhancing TT(PT)accuracy.Furthermore,PSR J1713+0747 exhibited no improvement after red-noise mitigation,as its long-term high-precision data and nonpower-law features of its residuals biased the noise model.Research confirms that red noise processing is of significant value to constructing high-precision PT. 展开更多
关键词 (stars:)pulsars individual(PSR J0437-4715,PSR J1909-3744,PSR J1744-1134,PSR J1713+0747)-time-methods data analysis
暂未订购 下载PDF
Lightcurve Features of Magnetar-powered Superluminous Supernovae with Gravitational-wave Emission and High-energy Leakage 认领 引用
17
作者 Jinghao Zhang Yacheng Kang +4 位作者 Jiahang Zhong Hong-Bo Li Liang-Duan Liu Yun-Wei Yu Lijing Shao 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第3期164-172,共9页
Superluminous supernovae(SLSNe)are a distinct class of stellar explosions,exhibiting peak luminosities 10-100 times brighter than those of normal SNe.Their extreme luminosities cannot be explained by the radioactive d... Superluminous supernovae(SLSNe)are a distinct class of stellar explosions,exhibiting peak luminosities 10-100 times brighter than those of normal SNe.Their extreme luminosities cannot be explained by the radioactive decay of 56Ni and its daughter 56Co alone.Consequently,models invoking newly formed millisecond magnetars have been widely proposed,capable of supplying additional energy through magnetic dipole radiation.For these rapidly rotating magnetars,however,gravitational-wave(GW)emission may also significantly contribute to the spin-down,particularly during their early evolutionary stages.While high-energy photons initially remain trapped within the optically thick ejecta,they will eventually escape as the ejecta becomes transparent during the expansion,thereby influencing the late-time lightcurve.In this work,we adopt an analytical framework to systematically explore the combined effects of GW emission and high-energy leakage on the lightcurve of SLSNe.Compared to scenarios that neglect these processes,we find that for magnetars with initial spin periods of millisecond,the combined influence suppresses early-time luminosities but enhances late-time emission.We further investigate the effects of the neutron-star equation of state to the lightcurve,GW emission efficiency,ejecta mass,and other relevant quantities.Our results highlight the complex interplay between GW-driven spin-down and radiative transport in shaping the observable features of SLSNe,offering new insights into diagnosing the nature of their central engines. 展开更多
关键词 (stars:)supernovae general-stars magnetars-gravitational waves-radiative transfer
暂未订购 下载PDF
基于人工智能的光谱可视化与分析平台 认领 引用
18
作者 雷国洪 濮渊豪 +3 位作者 徐洋 周芸帆 陈训舟 田海俊 《天文学报》 CAS CSCD 北大核心 2026年第4期81-94,共14页
光谱承载着海量天体物理及化学信息,是揭示天体本质乃至探索宇宙规律的重要手段.随着全球主要光谱巡天项目的持续推进,光谱数据量已达到千万级规模,这对数据处理和分析提出了新的挑战.为应对这一问题,团队设计并开发了一套基于人工智能... 光谱承载着海量天体物理及化学信息,是揭示天体本质乃至探索宇宙规律的重要手段.随着全球主要光谱巡天项目的持续推进,光谱数据量已达到千万级规模,这对数据处理和分析提出了新的挑战.为应对这一问题,团队设计并开发了一套基于人工智能的光谱可视化与分析平台,旨在降低光谱数据的使用门槛,提升科研与教学效率.该平台结合信息技术与机器学习算法,实现了用户管理、数据管理、可视化分析、光谱分类、参数测量、光谱标注以及多波段、多模态数据融合等功能,支持灵活的用户角色和数据管理策略.平台显著降低了海量光谱数据的分析难度,提升了科研产出效率,并作为国家天文科学数据中心的重要工具,服务于大科学工程项目,如LAMOST(Large Sky Area Multi-Object Fiber Spectroscopy Telescope)、MUST(MUltiplexed Survey Telescope)等的数据处理与科学研究.同时,平台在科教融合方面具有潜力,为创新型人才培养提供了新途径. 展开更多
关键词 天文数据库 天文光谱数据 天体测量学 大数据测量 天文仪器 光谱可视化平台
暂未订购 下载PDF
基于强激光的磁化天体等离子体物理研究 认领 引用
19
作者 赵忠海 乔宾 朱少平 《强激光与粒子束》 CAS CSCD 北大核心 2026年第8期208-223,共16页
强激光可产生与某些极端天体物理环境可比拟的等离子体及强磁场条件,为开展相关天体物理过程的实验室模拟提供了前所未有的平台。基于强激光的磁化天体等离子体研究已成为实验室天体物理这一交叉学科的前沿研究方向,也是世界上各大高功... 强激光可产生与某些极端天体物理环境可比拟的等离子体及强磁场条件,为开展相关天体物理过程的实验室模拟提供了前所未有的平台。基于强激光的磁化天体等离子体研究已成为实验室天体物理这一交叉学科的前沿研究方向,也是世界上各大高功率激光装置“发现科学”的重要组成部分。本文针对性地介绍了这一领域的研究视域、研究方法,以及近年来国内外在该领域取得的代表性研究成果,并结合国内大型激光装置发展趋势简要展望了该领域面临的可能机遇和挑战。 展开更多
关键词 实验室天体物理 强激光 磁化等离子体 磁场 粒子加速
暂未订购 下载PDF
Formation of Extremely Low-mass White Dwarfs in Wide Orbits 认领 引用
20
作者 Yangyang Zhang Zhenwei Li Xuefei Chen 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第2期218-223,共6页
Helium white dwarfs(WDs)with masses less than 0.3 M⊙are known as extremely low-mass WDs(ELM WDs),which cannot be produced by single stellar evolution in theory.Generally,these stars are believed to form through bi... Helium white dwarfs(WDs)with masses less than 0.3 M⊙are known as extremely low-mass WDs(ELM WDs),which cannot be produced by single stellar evolution in theory.Generally,these stars are believed to form through binary interactions.Recently,two ELM WDs in unusually wide orbits were reported,i.e.,KIC 8145411 and HE0430-2457.Their orbital separations are too wide to be produced by the binary evolution scenario.In this work,we study the formation of wide-orbit ELM WD binaries from hierarchical triple systems.In this scenario,an ELM WD is formed from the inner binary and subsequently forms a wide binary system with the third object.We find that the merger of an evolved star with a brown dwarf in the inner binary fails to produce single ELM WDs,but Type Ia supernovae(SNe Ia)explosions can successfully do so.Furthermore,we investigate the impact of the supernova explosion on the orbital distribution of the surviving binary and find that this channel may have a probability of reproducing the orbital parameters of HE 0430-2457,but fails to reproduce the observed features of KIC 8145411.This supports recent observational recalibrations suggesting that KIC 8145411 resides in a triple system rather than a binary. 展开更多
关键词 (stars)binaries(including multiple) close-stars evolution-(stars) white dwarfs
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 250 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈