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An axion-like scalar field environment effect on binary black hole merger

Research in Astronomy and Astrophysics 2018年第6期18卷 35-48页

作者： Qing Yang Li-Wei Ji Bin Hu zhou-jian cao Rong-Gen Cai Department of Astronomy Beijing Normal University Beijing 100875 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China

The environment, such as an accretion disk, could modify the signal of the gravitational wave from astrophysical black hole binaries. In this article, we model the matter field around intermediatemass binary black holes by means of an axion-like scalar field and investigate their joint evolution. In detail, we consider equal mass binary black holes surrounded by a shell of axion-like scalar field both in spherically symmetric and non-spherically symmetric cases, and with different strengths of the scalar field. Our result shows that the environmental scalar field could essentially modify the dynamics. Firstly,in the spherically symmetric case, with increase of the scalar field strength, the number of circular orbits for the binary black hole is reduced. This means that the scalar field could significantly accelerate the merger process. Secondly, once the scalar field strength exceeds a certain critical value, the scalar field could collapse into a third black hole with its mass being larger than that of the binary. Consequently,the new black hole that collapses from the environmental scalar field could accrete the binary promptly and the binary collides head-on with each other. In this process, there is almost no quadrupole signal produced, and, consequently, the gravitational wave is greatly suppressed. Thirdly, when the scalar field strength is relatively smaller than the critical value, the black hole orbit could develop eccentricity through accretion of the scalar field. Fourthly, during the initial stage of the inspiral, the gravitational attractive force from the axion-like scalar field could induce a sudden turn in the binary orbits, hence resulting in a transient wiggle in the gravitational waveform. Finally, in the non-spherical case, the scalar field could gravitationally attract the binary moving toward the center of mass for the scalar field and slow down the merger process.

关键词： stars: black holes gravitational waves methods: numerical

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Advancing gravitational theory through the tetrahedral constellation gravitational wave observatory

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Science China(Physics,Mechanics & Astronomy) 2024年

作者： Yun-Yong Wang zhou-jian cao Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University

The Tetrahedral Constellation Gravitational Wave Observatory (TEGO)[1]represents a significant leap forward in gravitational wave detection,advancing our understanding of gravitational *** introducing a fourth spacecraft to form a tetrahedral configuration,TEGO enhances traditional triangular setups,enabling the simultaneous sensitivity to all six gravitational wave polarization modes,including those not predicted by general relativity.

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Relation between gravitational mass and baryonic mass for non-rotating and rapidly rotating neutron stars

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Frontiers of physics 2020年第2期15卷 119-128页

作者： He Gao Shun-Ke Ai zhou-jian cao Bing Zhang Zhen-Yu Zhu Ang Li Nai-Bo Zhang Andreas Bauswein Department of Astronomy Beijing Normal UniversityBeijing 100875China Department of Physics and Astronomy University of Nevada Las VegasNV 89154USA Department of Astronomy Xiamen UniversityXiamen 361005China Institute for Theoretical Physics Max-von-Laue-Strasse 160438 FrankfurtGermany Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and PhysicsInstitute of Space SciencesShandong UniversityWeihai 264209China GSI Helmholtzzentrum fiir Schwerionenforschung Planckstrafie 164291 DarmstadtGermany

With a selected sample of neutron star(NS)equations of state(EOSs)that are consistent with the current observations and have a range of maximum masses,we investigate the relations between NS gravitational mass Mg and baryonic mass and the relations between the maximum NS mass supported through uniform rotation(Mmax)and that of nonrotating NSs(Mtov).We find that for an EOS-independent quadratic,universal transformation formula(Mb=Mg+A×M^2/g),the best-fit A value is 0.080 for non-rotating NSs,0.064 for maximally rotating NSs,and 0.073 when NSs with arbitrary rotation are *** residual error of the transformation is?0.1M⊙ for non-spin or maximum-spin,but is as large as?0.2M⊙ for all *** different EOSs,we find that the parameter A for non-rotating NSs is proportional to R^-1/1.4(where R1.4 is NS radius for 1.4M⊙ in units of km).For a particular EOS,if one adopts the best-fit parameters for different spin periods,the residual error of the transformation is smaller,which is of the order of O.O1M⊙ for the quadratic form and less than O.O1M⊙ for the cubic form(Mb=Mg+A1×M^2/g+A2×M^3/g).We also find a very tight and general correlation between the normalized mass gain due to spin △m≡(Mmax-MTOV)MTOV and the spin period normalized to the Keplerian period P,i.e.,log10 △m=(-2.74±0.05)log10 P+log10(0.20±0.01),which is independent of EOS *** empirical relations are helpful to study NS-NS mergers with a long-lived NS merger product using multi-messenger *** application of our results to GW170817 is discussed.

关键词： gravitational waves

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Cover story:Advancing gravitational wave astronomy:AI-enhanced detection and real-time analysis in the presence of glitches

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Chinese Physics C 2024年第4期48卷 4-4页

作者： zhou-jian cao Beijing Normal University

The discovery of gravitational waves (GWs) has inaugurated a new era of multi-messenger astronomy. Given the extremely weak strain of GWs, detectors must be engineered with unparalleled sensitivity. However, enhancing sensitivity raises the potential for GW signals to be impacted by transient noises, colloquially known as ‘glitches.’ These glitches pose significant challenges for both the detection of GW events and the accurate determination of their source parameters, ultimately affecting the reliability of subsequent physical analyses.

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Cover Story (Issue 6,2024)|Recent development on critical collapse

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Chinese Physics C 2024年第6期 264-264页

作者： zhou-jian cao Beijing Normal University

The discovery of the critical phenomena in gravitational collapse by Choptuik is a breakthrough in numerical *** studied the implosion of a massless scalar field in spherical *** are two extremities in this *** the fi...

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XPS STUDY OF METAL-METAL INTERACTION IN Co-Rh CLUSTER CATALYST

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Journal of Energy Chemistry 1994年第2期 204-210页

作者： zhou jian-Lue cao Zhao CHEN Yao-QiangGONG Mao-Chu CHEN YuDepartment of Chemistry and Aualytical & Testing Center Sichuan University Chengdu, Sichuan 610064

The metal-metal interaction in Co-Rh cluster catalyst derived from Co2Rh2(CO)12 was investigated by X-ray photoelectron spectroscopy (XPS). The results show that the Co-Rh interaction in Co2Rh2/γ-AI2O3 catalyst takes place. Rhodium can promote the reduction of cobalt, and cobalt can suppress the agglomeration of the reduced Rh particles when the catalyst is reduced at high temperature.

关键词： Rh AJ CO XPS STUDY OF METAL-METAL INTERACTION IN Co-Rh CLUSTER CATALYST 毗山沙卜 AI Co

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冲击荷载作用下软粘土变形和孔压的若干问题

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同济大学学报（自然科学版） 2001年第3期29卷 268-272页

作者：白冰周健曹宇春同济大学地下建筑与工程系上海200092

研究饱和软粘土的预剪及后固结性能 ,对饱和软粘土在冲击荷载作用下变形和孔压的一些规律作进一步探讨 .另外 ,在大量试验基础上 ,建立了一个冲击荷载作用下孔隙水压力的计算模式 ,并对影响孔压发展的诸如土性、固结应力状态、荷载强度... 详细信息

研究饱和软粘土的预剪及后固结性能 ,对饱和软粘土在冲击荷载作用下变形和孔压的一些规律作进一步探讨 .另外 ,在大量试验基础上 ,建立了一个冲击荷载作用下孔隙水压力的计算模式 ,并对影响孔压发展的诸如土性、固结应力状态、荷载强度等因素进行了简要分析 ,试图从另一个角度定量分析影响孔压发展的各种因素 .

关键词：饱和软粘土预剪后固结变形孔压冲击荷载孔隙水压力土性固结应力状态

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Prussian Blue Analogue‑Templated Nanocomposites for Alkali‑Ion Batteries:Progress and Perspective

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Nano-Micro Letters 2025年第1期17卷 216-261页

作者： jian‑En zhou Yilin Li Xiaoming Lin Jiaye Ye Key Laboratory of Theoretical Chemistry of Environment Ministry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006People’s Republic of China School of Chemistry and Physics Faculty of ScienceQueensland University of Technology2 George StreetBrisbaneQLD 4000Australia Centre for Materials Science Queensland University of Technology2 George StreetBrisbaneQLD 4000Australia

Lithium-ion batteries(LIBs)have dominated the portable electronic and electrochemical energy markets since their commercialisation,whose high cost and lithium scarcity have prompted the development of other alkali-ion batteries(AIBs)including sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs).Owing to larger ion sizes of Na^(+)and K^(+)compared with Li^(+),nanocomposites with excellent crystallinity orientation and well-developed porosity show unprecedented potential for advanced lithium/sodium/potassium *** enticing open rigid framework structures,Prussian blue analogues(PBAs)remain promising self-sacrificial templates for the preparation of various nanocomposites,whose appeal originates from the well-retained porous structures and exceptional electrochemical activities after thermal *** review focuses on the recent progress of PBA-derived nanocomposites from their fabrication,lithium/sodium/potassium storage mechanism,and applications in AIBs(LIBs,SIBs,and PIBs).To distinguish various PBA derivatives,the working mechanism and applications of PBA-templated metal oxides,metal chalcogenides,metal phosphides,and other nanocomposites are systematically evaluated,facilitating the establishment of a structure–activity correlation for these *** on the fruitful achievements of PBA-derived nanocomposites,perspectives for their future development are envisioned,aiming to narrow down the gap between laboratory study and industrial reality.

关键词： Prussian blue analogues Self-sacrificial template Lithium-ion batteries Sodium-ion batteries Potassium-ion batteries

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乳酸链球菌素在白酒发酵中的应用

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四川食品与发酵 2007年第5期43卷 11-14页

作者：周健操广东省九江酒厂有限公司广东南海528205

乳酸链球菌素应用与白酒发酵,对降低白酒总酸,抑制白酒发酵中乳酸菌的生长繁殖,控制白酒醪液中乳酸、乳酸乙酯的生成有明显的效果。综合使用成本、控制酸度的效果等方面来看,乳酸链球菌素较佳的添加量应该是0.5mg/L,最佳的添加时间应该... 详细信息

乳酸链球菌素应用与白酒发酵,对降低白酒总酸,抑制白酒发酵中乳酸菌的生长繁殖,控制白酒醪液中乳酸、乳酸乙酯的生成有明显的效果。综合使用成本、控制酸度的效果等方面来看,乳酸链球菌素较佳的添加量应该是0.5mg/L,最佳的添加时间应该是投料的同时,用水稀释后均匀加入。

关键词：乳酸链球菌素抑制酸度增加最佳添加时间最佳添加量

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Establishment of human cerebral organoid systems to model early neural development and assess the central neurotoxicity of environmental toxins

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Neural Regeneration Research 2025年第1期20卷 242-252页

作者： Daiyu Hu Yuanqing cao Chenglin Cai Guangming Wang Min zhou Luying Peng Yantao Fan Qiong Lai Zhengliang Gao Fundamental Research Center Shanghai Yangzhi Rehabilitation Hospital(Shanghai Sunshine Rehabilitation Center)School of MedicineTongji UniversityShanghaiChina Institute of Geriatrics(Shanghai University) Affiliated Nantong Hospital of Shanghai University(The Sixth People’s Hospital of Nantong)Shanghai University School of MedicineNantongJiangsu ProvinceChina Shanghai Engineering Research Center of Organ Repair Shanghai University School of MedicineShanghaiChina Key Laboratory of Arrhythmias Ministry of EducationShanghai East HospitalSchool of MedicineTongji UniversityShanghaiChina

Human brain development is a complex process,and animal models often have significant *** address this,researchers have developed pluripotent stem cell-derived three-dimensional structures,known as brain-like organoids,to more accurately model early human brain development and *** enable more consistent and intuitive reproduction of early brain development,in this study,we incorporated forebrain organoid culture technology into the traditional unguided method of brain organoid *** involved embedding organoids in matrigel for only 7 days during the rapid expansion phase of the neural epithelium and then removing them from the matrigel for further cultivation,resulting in a new type of human brain organoid *** cerebral organoid system replicated the temporospatial characteristics of early human brain development,including neuroepithelium derivation,neural progenitor cell production and maintenance,neuron differentiation and migration,and cortical layer patterning and formation,providing more consistent and reproducible organoids for developmental modeling and toxicology *** a proof of concept,we applied the heavy metal cadmium to this newly improved organoid system to test whether it could be used to evaluate the neurotoxicity of environmental *** organoids exposed to cadmium for 7 or 14 days manifested severe damage and abnormalities in their neurodevelopmental patterns,including bursts of cortical cell death and premature *** exposure caused progressive depletion of neural progenitor cells and loss of organoid integrity,accompanied by compensatory cell proliferation at ectopic *** convenience,flexibility,and controllability of this newly developed organoid platform make it a powerful and affordable alternative to animal models for use in neurodevelopmental,neurological,and neurotoxicological studies.

关键词： cadmium cell death cell proliferation cortical development environmental toxins neural progenitor cells neurogenesis neurotoxicology organoids stem cells

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