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Effects of dark matter on shadows and rings of Brane-World black holes illuminated by various accretions

Science China(Physics,Mechanics & Astronomy) 2022年第9期65卷 27-43页

作者： xiao-xiong zeng Ke-Jian He Guo-Ping Li State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong UniversityChongqing 400074China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China College of Physics Chongqing UniversityChongqing 401331China Physics and Space College China West Normal UniversityNanchong 637000China

In this study, by taking the accretions into account, the observed shadows and rings cast by the Brane-World black hole were numerically investigated when the observer was located at the cosmological horizon. The results showed that the radius rpof the photon sphere increased with the cosmological parameter α and dark matter parameter β, while the impact parameter bpdecreased with α and increased with β. For thin disk accretion, the total observed intensity is mainly composed of direct ***, the lensing ring and photon ring have only small and negligible contributions, respectively. We also found that shadows and rings exhibit different and exciting features when the disk is located at different positions. For static and infalling spherical accretions, it is evident that the size of shadows is always the same for both accretions. This implies that shadows are only related to space-time geometry in this case. The luminosity of the shadow and photon sphere is closely associated with the Doppler effect and the emissivity per unit volume j(νe). In addition, the influence of dark matter and cosmological constant on the observed intensity of shadows and rings is carefully emphasized throughout this paper. Finally, we obtained the burring images of shadows and rings using the nominal resolution of the event horizon telescope. We also studied the upper limits of the X-clod dark matter parameter β using the data of the shadow of M87.

关键词： dark matter the accretion black hole shadow lensing and photon rings

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Quasi-Local Masses of Rotating Space-Times

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Communications in Theoretical Physics 2017年第9期67卷 342-346页

作者： xiao-xiong zeng Ling Li School of Material Science and Engineering Chongqing Jiaotong University Chongqing 400074 China School of Mathematics Sichuan University of Arts and Science Dazhou 635000 China

We derive the Misner-Sharp-like masses Dilaton-Axion black hole by using the modified first of the Reissner-Nordstr6m black hole and the Einstein-Maxwell- law of thermodynamics. Their surface tensions are investigated. For the Reissner-NordstrSm black hole, the outer horizon radius is treated as a variable and the effective temperature is introduced. For the Einstein-Maxwe11-Dilaton-Axion black hole, the outer horizon radius, the angular momentum unit mass and the parameter b are seen as three independent variables, and the mass, the horizon area and the angular momentum are functions of them.

关键词： Misner-Sharp mass rotating space-times the modified first law of thermodynamics

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Thermodynamics and weak cosmic censorship conjecture in Born-Infeld-anti-de Sitter black holes

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Chinese Physics C 2021年第2期45卷 641-653页

作者： xiao-xiong zeng Hai-Qing Zhang State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong UniversityChongqing 400074China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China Center for Gravitational Physics Department of Space Science and International Research Institute of Multidisciplinary ScienceBeihang UniversityBeijing 100191China

In this study,we examine the laws of thermodynamics and the weak cosmic censorship conjecture in the normal and extended phase spaces of Born-Infeld-anti-de Sitter black holes by considering a charged particle *** the normal phase space,the first and second laws of thermodynamics as well as the weak cosmic censorship are still ***,in the extended phase space,the second law of thermodynamics is violated for double-horizon black holes and part of single-horizon black *** first law of thermodynamics and the weak cosmic censorship conjecture are still valid for all types of black *** addition,we found that the shift of the metric function,which determines the locations of the horizons,takes the same form at the minimum point in both the normal and extended phase spaces,indicating that the weak cosmic censorship conjecture is independent of the thermodynamic phase space.

关键词： black hole thermodynamics weak cosmic censorship conjecture Born-Infeld black hole

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Weak cosmic censorship conjecture and thermodynamics in quintessence Ad S black hole under charged particle absorption

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Chinese Physics C 2019年第12期43卷 169-179页

作者： Ke-Jian He Xin-Yun Hu xiao-xiong zeng Physics and Space College China West Normal UniversityNanchong 637000China College of Economic and Management Chongqing Jiaotong UniversityChongqing 400074China State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong UniversityChongqing 400074China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China

Considering the cosmological constant as the pressure,this study addresses the laws of thermodynamics and weak cosmic censorship conjecture in the Reissner-Nordstrom-AdS black hole surrounded by quintessence dark energy under charged Particle *** first law of thermodynamics i5 found to be valid as a Particle is absorbed by the black *** second law,however,is violated for the extremal and near-extremal black holes,because the entropy of these black hole ***,we find that the extremal black hole does not change its configuration in the extended phase space,implying that the weak cosmic censorship conjecture is ***,the near-extremal black hole can be overcharged beyond the extremal condition under charged particle ***,the cosmic censorship conjecture could be violated for the near-extremal black hole in the extended phase *** comparison,we also discuss the first law,second law,and the weak cosmic censorship conjecture in normal phase space,and find that all of them are valid in this case.

关键词： thermodynamics weak cosmic censorship conjecture quintessence AdS black hole

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Thermodynamics and weak cosmic censorship conjecture of BTZ black holes in extended phase space

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Chinese Physics C 2019年第10期43卷 112-117页

作者： xiao-xiong zeng Yi-Wen Han De-You Che Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong UniversityChongqing 400074China School of Computer Science and Information Engineering Chongqing Technology and Business UniversityChongqing 400070China School of Science Xihua UniversityChengdu 610039SichuanChina

As a charged fermion drops into a BTZ black hole, the laws of thermodynamics and the weak cosmic censorship conjecture are investigated in both the normal and extended phase space, where the cosmological parameter and renormalization length are regarded as extensive quantities. In the normal phase space, the first and second law of thermodynamics, and the weak cosmic censorship are found to be valid. In the extended phase space, although the first law and weak cosmic censorship conjecture remain valid, the second law is dependent on the variation of the renormalization energy dK. Moreover, in the extended phase space, the configurations of extremal and near-extremal black holes are not changed, as they are stable, while in the normal phase space, the extremal and near-extremal black holes evolve into non-extremal black holes.

关键词： weak cosmic censorship conjecture thermodynamics BTZ black holes

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Thermodynamics and weak cosmic censorship conjecture of an AdS black hole with a monopole in the extended phase space

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Chinese Physics C 2020年第5期44卷 133-139页

作者： Xin-Yun Hu Ke-Jian He xiao-xiong zeng Jian-Pin Wu College of Economic and Management Chongqing Jiaotong UniversityChongqing 400074China Physics and Space College China West Normal UniversityNanchong 637000China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

The first law of black hole thermodynamics has been shown to be valid in the extended phase ***,the second law and the weak cosmic censorship conjecture have not been investigated *** investigate the laws of thermodynamics and the weak cosmic censorship conjecture of an AdS black hole with a global monopole in the extended phase space in the case of charged particle *** is shown that the first law of thermodynamics is valid,while the second law is violated for the extremal and near-extremal black ***,we find that the weak cosmic censorship conjecture is valid only for the extremal black hole,and that it can be violated for the near-extremal black holes,which is different from the previous results.

关键词： weak cosmic censorship conjecture thermodynamics global monopole black holes

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Dynamics of holographic images of scalar-tensor-vector gravity-AdS black holes

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Chinese Physics C 2024年第9期48卷 274-290页

作者： Xin-Yun Hu M.Israr Aslam Rabia Saleem xiao-xiong zeng College of Economic and Management Chongqing Jiaotong UniversityChongqing 400074China Department of Mathematics COMSATS University IslamabadLahore-CampusLahore 54000 Pakistan State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong UniversityChongqing 400074China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China

Using AdS/CFT correspondence,we analyze the holographic Einstein images via the response function of the complex scalar field as a probe wave on an AdS Schwarzschild scalar-tensor-vector gravity(STVG)black hole(BH).We find that the amplitude of the response function||decreases with increasing values of coupling parameter a and increases with decreasing temperature *** frequencyωof the wave source also plays a significant role in wave periods;as we increase the values ofω,the periods of waves decrease,indicating that the total response function closely depends on the wave ***,we investigate the optical appearance of the holographic images of the BH in *** found that the holographic ring always appears with surrounding concentric stripes when the observer is located at the north pole,and an extremely bright ring appears when the observer is at the position of the photon sphere of the *** ring changes into a luminosity-deformed ring or a bright light spot as the observational angle *** corresponding brightness profiles show that the luminosity of the ring decreases and the shadow radius increases with increasing values of *** relation between temperature T and the inverse of the horizonh_e is discussed;T is small at the beginning of the horizon he and then increases as the horizon radius *** effect can be used to distinguish the STVG BH solution from other BH ***,these significant features are also reflected in the Einstein ring and corresponding brightness *** addition,we compare the results obtained by wave optics and geometric optics,which align well,implying that the holographic scheme adopted in this study is valid.

关键词： scalar-tensor-vector gravity shadows AdS/CFT correspondence

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Holographic Einstein ring of a charged Rastall AdS black hole with bulk electromagnetic field

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Chinese Physics C 2024年第11期48卷 120-137页

作者： M.Israr Aslam xiao-xiong zeng Rabia Saleem Xin-Yun Hu Department of Mathematics COMSATS University IslamabadLahore CampusLahore-54000 Pakistan State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong UniversityChongqing 400074China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China College of Economic and Management Chongqing Jiaotong UniversityChongqing 400074China

We study the Einstein images of a charged Rastall AdS black hole(BH)within the fabric of AdS/CFT *** the holographic setup,we analyze the amplitude of the total response function for various values of model *** an increase in parameterλand temperature T,the amplitude of the response function decreases,while it increases with an increase in electric charge e and chemical potentialμ.The influence of frequencyωalso plays an important role in the bulk field,as it is found that decreasingωleads to an increase in the periods of the waves,which means that the amplitude of the response function also depends on the wave *** relation between T and the inverse of the horizon for various values of parameterλis interpreted under fixed values of other involved ***,in turn,affect the behavior of the response function and the Einstein ring,which may be used to differentiate the present study from previous *** construct the holographic images of the BH in bulk via a special optical *** results show that the Einstein ring always appears with concentric stripes at the position of the north pole,and this ring transforms into a luminosity-deformed ring or bright light spot when the distant observer lies away from the north ***,we discuss the influence of the associated parameters on the Einstein ring radius,which is consistent with wave optics.

关键词： Rastall gravity AdS/CFT correspondence Black hole Einstein rings

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INTERLEUKIN-6 PROTECTS ANNULUS FIBROSUS CELL FROM APOPTOSIS INDUCED BY INTERLEUKIN-1β IN VITRO

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Chinese Medical Sciences Journal 2006年第2期21卷 107-110页

作者： De-yu Duan Shu-hua Yang xiao-qian xiong zeng-wu Shao Hong Wang Department of Orthopedics Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022

Objective To investigate the effect of interleukin-6 （ IL-6 ） on the apoptosis of annulus fibrosus （AF） cell induced by intedeukin-1β （IL-1β）. Methods Cultured AF cells were divided into 6 groups and treated with no drug, 10 ng/mL IL-6, 10 ng/mL IL-1β, 10 ng/mL IL-1β and Z-VAD-FMK （ a caspase-9 inhibitor）, 10 ng/mL IL-1β and 10 ng/mL IL-6, 10 ng/mL IL-1β and 100 ng/mL IL-6, respectively. After three days of culture, the apoptosis rate, the positive rates of caspase-3, -8, and -9 of AF cells were detected with flow cytometry. Results The apoptosis rates of cells in group 1 to 6 were 2.67% ± 1.08%, 2.71% ± 0.53%, 20. 37% ± 1.57 %, 11.34% ± 0.67 %, 18.17 % ± 0.74%, and 9.42 % ± 1.08 %, respectively. There was no significant difference between group 1 and 2, while the apoptosis rates of group 4, 5, and 6 were significantly lower than group 3 （ P = 0. 001, P =0. 172, and P =0. 001, respectively）. Positive rates of caspase-3 in group 5 （ 12. 35% ±0.64% ） and 6 （9.26% ±0. 36% ） were significantly lower than group 3 （ 17.14% ±0. 72% ; P =0. 001 and P 〈0.001, respectively）. And positive rates of caspase-9 in group 5 （ 15.13% ± 1.45% ） and 6 （ 10.17% ± 2.50% ） were significantly lower than group 3 （ 19.4% ±0.98% ; P =0. 014 and P =0. 004, respectively）. But there was not obvious change of caspase-8 activity after IL-6 was added. Conclusion IL-6 is capable of protecting AF cells from IL-1β induced apoptosis in vitro. Mechanism of the protection is related with the inhibition of caspase-3 and -9 activities.

关键词： intervertebral disc apoptosis interleukin-6 interleukin-1β

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Abnormality of chromosome 8 in desmoid-type fibromatosis

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Chinese Medical Journal 2007年第9期120卷 838-840页

作者： YANG Ji-long WANG Jian ZHOU xiao-yan LI xiao-qiu ZHU xiong-zeng Department of Pathology Cancer Hospital Fudan University Shanghai 200032 China

Desmoid-type fibromatoses are clonal fibroblastic proliferations that arise in deep soft tissues and are characterized by infiltrative growth and a tendency toward local recurrence. The molecular genetic studies show that there are chromosomal abnormalities relating to the pathogenesis of this lesion, such as trisomy 8. However, there are different results concerning this type of abnormality. Fluorescence in situ hybridization （FISH） is a sensitive and reproducible technique that combines molecular cytogenetics with morphologic information and brings them together in a single frame for evaluation. To explore the controversy of the aneuploid abnormality of chromosome 8, we collected specimens of desmoid-type fibromatosis to determine whether the existence of trisomy 8 chromosome abnormalities correlates with clinicopathologic features, as well as to investigate the feasibility of detecting trisomy 8 in FFPE tissue by FISH method.

关键词： desmoid-type fibromatosis fluorescence in situ hybridization trisomy 8

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