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Holographic images of an AdS black hole within the framework of f(R) gravity theory

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Frontiers of physics 2024年第5期19卷 35-47页

作者： Guo-Ping Li Ke-Jian He Xin-Yun Hu qing-quan jiang School of Physics and Astronomy China West Normal UniversityNanchong 637000China College Of Physics Chongqing UniversityChongqing 401331China College of Economic and Management Chongqing Jiaotong UniversityChongqing 400074China

Based on the AdS/CFT correspondence,this study employs an oscillating Gaussian source to numerically study the holographic images of an AdS black hole under f(R)gravity using wave *** to the diffraction of scalar wave,it turns out that one can clearly observed the interference patten of the absolute amplitude of response function on the AdS ***,it is observed that its peak increases with the f(R)parameterαbut decreases with the global monopoleη,frequencyω,and horizon r_(h).More importantly,the results reveal that the holographic Einstein ring is a series of concentric striped patterns for an observer at the North Pole and that their center is analogous to a Poisson-Arago *** ring can evolve into a luminosity-deformed ring or two light spots when the observer is at a different *** to geometrical optics,it is true that the size of the brightest holographic ring is approximately equal to that of the photon sphere,and the two light spots correspond to clockwise and anticlockwise light *** addition,holographic images for different values of black holes and optical system parameters were obtained,and different features ***,we conclude that the holographic rings of the AdS black hole in modified gravities are more suitable and helpful for testing the existence of a gravity dual for a given material.

关键词： AdS black hole holographic images AdS/CFT correspondence

Joule-Thomson expansion of the regular(Bardeen)-AdS black hole

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Chinese Physics C 2020年第3期44卷 148-154页

作者： Sen Guo Jin Pu qing-quan jiang Xiao-Tao Zu College of Physics and Space Science China West Normal UniversityNanchong 637002China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China

We study the Joule-Thomson expansion of the regular black hole in an anti-de Sitter background,and obtain the inversion temperature for the Bardeen-AdS black hole in the extended phase *** investigate the isenthalpic and inversion curves for the Bardeen-AdS black hole in the T-P plane and find that the intersection points between them are exactly the inversion points discriminating the heating from the cooling *** inversion curve for the regular(Bardeen)-AdS black hole is not closed and there is only a lower inversion curve,in contrast to the Van der Waals *** importantly,we find that the ratio between the minimum inversion temperature and the critical temperature for the regular(Bardeen)-AdS black hole is 0.536622,which is larger than any known ratio for the singular black *** large ratio for the Bardeen-AdS black hole may be due to the repulsive de Sitter core near the origin of the regular black hole.

关键词： Joule-Thomson expansion inversion curve inversion temperature the regular(Bardeen)-AdS black hole

Deformed dispersion relation constraint with hydrogen atom 1S-2S transition

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Chinese Physics C 2020年第1期44卷 47-52页

作者： Jin Pu Guo-Ping Li qing-quan jiang Xiao-Tao Zu School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China College of Physics and Space Science China West Normal UniversityNanchong 637002China

We use the latest results of the ultra-high accuracy 1S-2S transition experiments in the hydrogen atom to constrain the forms of the deformed dispersion relation in the non-relativistic *** the leading correction of the non-relativistic limit,the experiment sets a limit at an order of magnitude for the desired Planck-scale level,thereby providing another example of the Planck-scale sensitivity in the study of the dispersion relation in controlled laboratory *** the next-to-leading term,the bound is two orders of magnitude away from the Planck scale,however it still amounts to the best limit,in contrast to the previously obtained bound in the non-relativistic limit from the cold-atom-recoil experiments.

关键词： deformed dispersion relation hydrogen atom transition experiment Planck-scale sensitivity

Application of Newtonian approximate model to LIGO gravitational wave data processing

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Chinese Physics B 2023年第9期32卷 192-199页

作者：吴洁李瑾蒋青权 College of Physics Chongqing UniversityChongqing 401331China Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics Chongqing UniversityChongqing 401331China School of Physics and Astronomy China West Normal UniversityNanchong 637009China

With the observation of a series of ground-based laser interferometer gravitational wave(GW)detectors such as LIGO and Virgo,nearly 100 GW events have been detected *** present,all detected GW events are generated by the mergers of compact binary systems and are identified through the data processing of matched *** on matched filtering,we use the GW waveform of the Newtonian approximate(NA)model constructed by linearized theory to match the events detected by LIGO and injections to determine the coalescence time and utilize the frequency curve for data fitting to estimate the parameters of the chirp masses of binary black holes(BBHs).The average chirp mass of our results is 22.05_(-6.31)^(+6.31)M_(⊙),which is very close to 23.80_(-3.52)^(+4.83)M_(⊙)provided by *** the process,we can analyze LIGO GW events and estimate the chirp masses of the *** work presents the feasibility and accuracy of the low-order approximate model and data fitting in the application of GW data *** is beneficial for further data processing and has certain research value for the preliminary application of GW data.

关键词： gravitational waves black holes matched filtering data fitting

Astrophysical observables for regular black holes with sub-Planckian curvature

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Chinese Physics C 2023年第8期47卷 136-148页

作者：曾伟凌意蒋青权 School of Physics and Astronomy China West Normal UniversityNanchong 637002China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China School of Physics University of Chinese Academy of SciencesBeijing 100049China

We investigate the photon sphere and marginally stable circular orbit of massive particles over the re-cently proposed regular black holes with sub-Planckian curvature and a Minkowskian *** derive the effective potential for geodesic orbits and determine the radius of circular photon orbits,with an analysis of the stability of these *** extend our analysis to the background of a compact massive object(CMO)without a horizon,whose mass is below the lowest bound for the formation of a black *** massive particles,marginally stable cir-cular orbits become double-valued in the CMO *** a comparison with Bardeen and Hayward black holes,we also find that the locations of the photon sphere and marginally stable circular orbit in the CMO phase with a Minkowskian core are evidently different from those in the CMO phase with a dS core,which potentially provides a way to distinguish between these two types of black holes by astronomical ***,we present the ob-servational constraint on the deviation parameter for such regular black holes using observed data from the black hole M87^(*).

关键词： regular black holes photon sphere marginally stable circular orbit

Generalized uncertainty principle and black hole thermodynamics

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Chinese Physics C 2020年第9期44卷 186-193页

作者： Jin Pu Qin-Bin Mao qing-quan jiang Jing-Xia Yu Xiao-Tao Zu School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China College of Physics and Space Science China West Normal UniversityNanchong 637002China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduSichuan 610054China

Banerjee-Ghosh's work shows that the singularity problem can be naturally avoided by the fact that black hole evaporation stops when the remnant mass is greater than the critical mass when including the generalized uncertainty principle(GUP)effects with first-and second-order *** this paper,we first follow their steps to reexamine Banerjee-Ghosh's work,but we find an interesting result:the remnant mass is always equal to the critical mass at the final stage of black hole evaporation with the inclusion of the GUP ***,we use Hossenfelder's GUP,i.e.,another GUP model with higher-order corrections,to restudy the final evolution behavior of the black hole evaporation,and we confirm the intrinsic self-consistency between the black hole remnant and critical masses once *** both cases,we also find that the thermodynamic quantities are not singular at the final stage of black hole evaporation.

关键词： black hole thermodynamics generalized uncertainty principle remnant mass critical mass

Additional observational features of the thin-shell wormhole by considering quantum corrections

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Chinese Physics C 2024年第12期48卷 200-211页

作者： Yun-Xian Chen He-Bin Zheng Ke-Jian He Guo-Ping Li qing-quan jiang Physics and Space College China West Normal UniversityNanchong 637000China School of Civil Engineering Chongqing Jiaotong University 400074China

By considering an asymmetric thin-shell wormhole(ATSW)surrounded by an optically and geometrically thin disk,we investigate the luminosity distribution of this ATSW with the spacetime on two sides encoded with the renormalization group improved(RGI)parameters(Ω,γ).Although some light rays are absorbed into the throat in the vicinity of the wormhole,they return through the throat with certain conditions,unlike in the case of black *** spacetime on one side of the wormhole can capture the additional photons emitted from the thin disk,resulting in several interesting observable features of the *** results in this paper show that there are two additional orbit numbers n in the ATSW and six transfer functions,rather than three as in the black hole *** this case,the ATSW indeed has a more complex observable structure,where some additional light rings arise *** instance,there are two additional photon rings for the emitted Model ***,we also find a new wide hump between the first and second additional photon rings in Model *** effects of Ω and γ on the observed images are clearly addressed throughout this study,and the influence of Ω is found to be ***,we conclude that the observations of the RGI-ATSW can help further distinguish it from other ATSWs and black holes when a thin accretion disk exists around it.

关键词： additional observational features thin-shell wormhole photon rings quantum corrections

Triple points and phase transitions of D-dimensional dyonic Ad S black holes with quasitopological electromagnetism in Einstein–Gauss–Bonnet gravity

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Chinese Physics B 2024年第6期33卷 272-287页

作者：牟平辉蒋青权何柯腱李国平 School of Physics and Astronomy China West Normal UniversityNanchong 637000China College of Physics Chongqing UniversityChongqing 401331China

By considering the negative cosmological constant Λ as a thermodynamic pressure, we study the thermodynamics and phase transitions of the D-dimensional dyonic Ad S black holes(BHs) with quasitopological electromagnetism in Einstein–Gauss–Bonnet(EGB) gravity. The results indicate that the small/large BH phase transition that is similar to the van der Waals(vdW) liquid/gas phase transition always exists for any spacetime dimensions. Interestingly, we then find that this BH system exhibits a more complex phase structure in 6-dimensional case that is missed in other ***, it shows for D = 6 that we observed the small/intermediate/large BH phase transitions in a specific parameter region with the triple point naturally appeared. Moreover, when the magnetic charge turned off, we still observed the small/intermediate/large BH phase transitions and triple point only in 6-dimensional spacetime, which is consistent with the previous results. However, for the dyonic Ad S BHs with quasitopological electromagnetism in Einstein–Born–Infeld(EBI) gravity, the novel phase structure composed of two separate coexistence curves observed by Li et al. [Phys. Rev. D105 104048(2022)] disappeared in EGB gravity. This implies that this novel phase structure is closely related to gravity theories, and seems to have nothing to do with the effect of quasitopological electromagnetism. In addition, it is also true that the critical exponents calculated near the critical points possess identical values as mean field theory. Finally, we conclude that these findings shall provide some deep insights into the intriguing thermodynamic properties of the dyonic Ad S BHs with quasitopological electromagnetism in EGB gravity.

关键词： AdS black hole phase transition triple point

Rastall gravity:accretion disk image in the context of radiation fields and visual transformations compared to Reissner-Nordström black hole

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Chinese Physics C 2024年第4期48卷 174-182页

作者：黄宇翔郭森梁宇崔宇昊蒋青权林恺 School of Physics and Astronomy China West Normal UniversityNanchong 637000China Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China Hubei Subsurface Multi-scale Imaging Key Laboratory Institute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China

In this study,we investigated the astronomical implications of Rastall gravity,particularly its behavior amidst a radiation field compared to Reissner-Nordström(RN)black *** found a crucial correlation between the dynamics of the accretion disk and the parameters Q and Nr,which properly reflect the influence of spacetime metrics on the disk’s *** electric charge Q causes contraction in the disk’s orbit due to enhanced gravitational effects,while higher Nr values lead to outward expansion,influenced by the attributes of the radiation ***,the charged black holes surrounded by radiation fields exhibit distinct visual disparities from RN black *** decreases and expansion occurs within the innermost stable circular orbit of the accretion disk with rising Nr *** study also reveals the process by which the accretion disk transitions from a conventional disk-like structure to a hat-like form at different observation angles,with the redshift effect gradually ***,the results of the considered Rastall gravity radiation field are consistent with the constraints of the gravitational lensing of the host galaxy on Rastall gravity parameters,thereby enhancing the consistency between theoretical predictions and actual observations.

关键词： Rastall theory optical appearance thin accretion disk