Pub Date : 2024-08-31DOI: 10.1088/1674-1137/ad53b9
Jafar Sadeghi, Mohammad Reza Alipour, Saeed Noori Gashti and Mohammad Ali S. Afshar
In this study, we investigate the bulk-boundary and restricted phase space (RPS) thermodynamics of Rissner-Nordström (R-N) AdS and 6-dimensional charged Gauss-Bonnet AdS black holes. Additionally, we examine the topological characteristics of the considered black holes and compare them with the results of extended thermodynamics. We determine that the topological behavior of the bulk-boundary thermodynamics is the same as that of the extended thermodynamics, whereas the RPS thermodynamics exhibits a distinct behavior. Furthermore, we demonstrate that within the RPS formalism, there is only one critical point with a topological charge of +1 . Moreover, in the RPS formalism, the inclusion of higher-derivative curvature terms in the form of Gauss-Bonnet gravity does not alter the topological classification of critical points in charged AdS black holes.
{"title":"Bulk-boundary and RPS thermodynamics from topology perspective","authors":"Jafar Sadeghi, Mohammad Reza Alipour, Saeed Noori Gashti and Mohammad Ali S. Afshar","doi":"10.1088/1674-1137/ad53b9","DOIUrl":"https://doi.org/10.1088/1674-1137/ad53b9","url":null,"abstract":"In this study, we investigate the bulk-boundary and restricted phase space (RPS) thermodynamics of Rissner-Nordström (R-N) AdS and 6-dimensional charged Gauss-Bonnet AdS black holes. Additionally, we examine the topological characteristics of the considered black holes and compare them with the results of extended thermodynamics. We determine that the topological behavior of the bulk-boundary thermodynamics is the same as that of the extended thermodynamics, whereas the RPS thermodynamics exhibits a distinct behavior. Furthermore, we demonstrate that within the RPS formalism, there is only one critical point with a topological charge of +1 . Moreover, in the RPS formalism, the inclusion of higher-derivative curvature terms in the form of Gauss-Bonnet gravity does not alter the topological classification of critical points in charged AdS black holes.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141949446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-31DOI: 10.1088/1674-1137/ad5a70
Ahmad Al-Badawi, Mirzabek Alloqulov, Sanjar Shaymatov and Bobomurat Ahmedov
In this study, we investigated the optical properties of charged black holes within the Einstein-Maxwell-scalar (EMS) theory. We evaluated the shadow cast by these black holes and obtained analytical solutions for both the radius of the photon sphere and that of the shadow. We observed that black hole parameters γ and β both influence the shadow of black holes. We also found that the photon sphere and shadow radius increase as a consequence of the presence of the parameter γ. Interestingly, the shadow radius decreases first and then remains unchanged owing to the impact of the parameter β. Finally, we analyzed the weak gravitational lensing and total magnification of lensed images around black holes. We found that the charge of the black holes and the parameter β both have a significant impact, reducing the deflection angle. Similarly, the same behavior for the total magnification was observed, also as a result of the effect of the charge of the black holes and the parameter β.
{"title":"Shadows and weak gravitational lensing for black holes within Einstein-Maxwell-scalar theory*","authors":"Ahmad Al-Badawi, Mirzabek Alloqulov, Sanjar Shaymatov and Bobomurat Ahmedov","doi":"10.1088/1674-1137/ad5a70","DOIUrl":"https://doi.org/10.1088/1674-1137/ad5a70","url":null,"abstract":"In this study, we investigated the optical properties of charged black holes within the Einstein-Maxwell-scalar (EMS) theory. We evaluated the shadow cast by these black holes and obtained analytical solutions for both the radius of the photon sphere and that of the shadow. We observed that black hole parameters γ and β both influence the shadow of black holes. We also found that the photon sphere and shadow radius increase as a consequence of the presence of the parameter γ. Interestingly, the shadow radius decreases first and then remains unchanged owing to the impact of the parameter β. Finally, we analyzed the weak gravitational lensing and total magnification of lensed images around black holes. We found that the charge of the black holes and the parameter β both have a significant impact, reducing the deflection angle. Similarly, the same behavior for the total magnification was observed, also as a result of the effect of the charge of the black holes and the parameter β.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-31DOI: 10.1088/1674-1137/ad5663
Kun Wang, 坤 王, Pengfu Tian, 鹏夫 田, Jingya Zhu and 经亚 朱
In this study, we explore the detectability of heavy Higgs bosons in the channel at a 100 TeV hadron collider within the semi-constrained next-to-minimal supersymmetric standard model. We calculate their production cross sections and decay branching ratios and compare them with simulation results from literature. We focus on the heavy doublet-dominated CP-even Higgs H and CP-odd Higgs A, with mass limits set below 10 TeV to ensure detectability. At a collider with an integrated luminosity of 3 ab , the potential for detecting heavy Higgs bosons varies significantly with their mass and . Heavy Higgs bosons with masses below 2 TeV are within the testable range, while those heavier than 7 TeV are below the exclusion and discovery thresholds, rendering them undetectable. For masses between 2 and 7 TeV, heavy Higgs bosons with smaller than 20 can be detected, whereas those with larger than 20 are beyond the current discovery or exclusion capabilities.
在这项研究中，我们探讨了在半约束的下至最小超对称标准模型中，100 TeV 强子对撞机通道中重希格斯玻色子的可探测性。我们计算了它们的产生截面和衰变分支比，并与文献中的模拟结果进行了比较。我们的研究重点是以重双特为主的CP偶合希格斯粒子H和CP非偶合希格斯粒子A，其质量限值设定在10 TeV以下，以确保可探测性。在综合光度为 3 ab 的对撞机上，探测到重希格斯玻色子的可能性随其质量和质量的不同而有很大差异。 质量低于 2 TeV 的重希格斯玻色子在可检测范围之内，而重于 7 TeV 的则低于排除和发现阈值，因而无法探测到。对于质量在 2 到 7 TeV 之间的重希格斯玻色子，质量小于 20 的可以检测到，而质量大于 20 的则超出了目前的发现或排除能力。
{"title":"Exploration of heavy Higgs bosons at a 100 TeV hadron collider withinthe semi-constrained next-to-minimal supersymmetric standard model*","authors":"Kun Wang, 坤 王, Pengfu Tian, 鹏夫 田, Jingya Zhu and 经亚 朱","doi":"10.1088/1674-1137/ad5663","DOIUrl":"https://doi.org/10.1088/1674-1137/ad5663","url":null,"abstract":"In this study, we explore the detectability of heavy Higgs bosons in the channel at a 100 TeV hadron collider within the semi-constrained next-to-minimal supersymmetric standard model. We calculate their production cross sections and decay branching ratios and compare them with simulation results from literature. We focus on the heavy doublet-dominated CP-even Higgs H and CP-odd Higgs A, with mass limits set below 10 TeV to ensure detectability. At a collider with an integrated luminosity of 3 ab , the potential for detecting heavy Higgs bosons varies significantly with their mass and . Heavy Higgs bosons with masses below 2 TeV are within the testable range, while those heavier than 7 TeV are below the exclusion and discovery thresholds, rendering them undetectable. For masses between 2 and 7 TeV, heavy Higgs bosons with smaller than 20 can be detected, whereas those with larger than 20 are beyond the current discovery or exclusion capabilities.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The complete and incomplete fusion cross section as well as one-neutron stripping process of 6Li + 94Zr system were measured at the energies around the Coulomb barrier by online γ-ray method. In addition to a 30% suppression factor when compared with the measured total fusion process, the complete fusion cross section in 6Li + 94Zr system was observed to be significantly lower than those in the nearby 6Li + 90, 96Zr system. The new experimental result implies that the coupling with breakup channel in the 6Li-induced fusion processes can be affected by the inner structure of the target, which is still not clear in any available model calculation. For the one-neutron stripping process, the direct production cross sections for each level in 95Zr were extracted and compared with the coupled reaction channel calculation, offering a unique opportunity to examine the single-particle nature of the produced excited states. Given the fact that an overall overestimation of the production cross section for 954-keV and 1618-keV levels was observed in the comparison, further investigation is highly demanded in order to understand the full reaction mechanism for the one-neutron stripping process induced by 6Li.
{"title":"Fusion and one-neutron stripping process for 6Li + 94Zr system around the Coulomb Barrier*","authors":"Xuedou Su, 学斗 苏, Guangxin Zhang, 广鑫 张, Shipeng Hu, 世鹏 胡, Peiwei Wen, 琣威 温, H. O. Soler, Gaolong Zhang, 高龙 张, Boshuai Cai, 博帅 蔡, Cenxi Yuan, 岑溪 袁, J. L. Ferreira, Zhenwei Jiao, 振威 焦, Mingli Wang, 明李 王, Xiaoyu Wang, 小雨 汪, Zhen Huang, 珍 黄, Huanqiao Zhang, 焕乔 张, Chunlei Zhang, 春雷 张, Xiaoguang Wu, 晓光 吴, Yun Zheng, 云 郑, Congbo Li, 聪博 李, Tianxiao Li, 天晓 李 and J. Lubian","doi":"10.1088/1674-1137/ad50b9","DOIUrl":"https://doi.org/10.1088/1674-1137/ad50b9","url":null,"abstract":"The complete and incomplete fusion cross section as well as one-neutron stripping process of 6Li + 94Zr system were measured at the energies around the Coulomb barrier by online γ-ray method. In addition to a 30% suppression factor when compared with the measured total fusion process, the complete fusion cross section in 6Li + 94Zr system was observed to be significantly lower than those in the nearby 6Li + 90, 96Zr system. The new experimental result implies that the coupling with breakup channel in the 6Li-induced fusion processes can be affected by the inner structure of the target, which is still not clear in any available model calculation. For the one-neutron stripping process, the direct production cross sections for each level in 95Zr were extracted and compared with the coupled reaction channel calculation, offering a unique opportunity to examine the single-particle nature of the produced excited states. Given the fact that an overall overestimation of the production cross section for 954-keV and 1618-keV levels was observed in the comparison, further investigation is highly demanded in order to understand the full reaction mechanism for the one-neutron stripping process induced by 6Li.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141929995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-31DOI: 10.1088/1674-1137/ad5428
Abdul Kabir, Jameel-Un Nabi, Muhammad Tahir, Abdul Muneem and Zain Ul Abideen
The neutron capture rates and temperature dependent stellar beta decay rates of Mo isotopes are investigated within the framework of the statistical code TALYS v1.96 and the proton neutron quasi particle random phase approximation (pn-QRPA) model. The Maxwellian average cross-section (MACS) and neutron capture rates for the Mo(n,γ) Mo radiative capture process are analyzed within the framework of the statistical code TALYS v1.96 based on the phenomenological nuclear level density model and gamma strength functions. The present model-based computations for the MACS are comparable to the existing measured data. The sensitivity of stellar weak interaction rates to various densities and temperatures is investigated within the framework of the pn-QRPA model. Particular attention is paid to the impact of thermally filled excited states in the decaying nuclei ( Mo) on electron emission and positron capture rates. Furthermore, we compare the neutron capture rates and stellar beta decay rates. It is found that neutron capture rates are higher than stellar beta decay rates at both lower and higher temperatures.
{"title":"Re-analysis of temperature dependent neutron capture rates and stellar β-decay rates of 95-98Mo","authors":"Abdul Kabir, Jameel-Un Nabi, Muhammad Tahir, Abdul Muneem and Zain Ul Abideen","doi":"10.1088/1674-1137/ad5428","DOIUrl":"https://doi.org/10.1088/1674-1137/ad5428","url":null,"abstract":"The neutron capture rates and temperature dependent stellar beta decay rates of Mo isotopes are investigated within the framework of the statistical code TALYS v1.96 and the proton neutron quasi particle random phase approximation (pn-QRPA) model. The Maxwellian average cross-section (MACS) and neutron capture rates for the Mo(n,γ) Mo radiative capture process are analyzed within the framework of the statistical code TALYS v1.96 based on the phenomenological nuclear level density model and gamma strength functions. The present model-based computations for the MACS are comparable to the existing measured data. The sensitivity of stellar weak interaction rates to various densities and temperatures is investigated within the framework of the pn-QRPA model. Particular attention is paid to the impact of thermally filled excited states in the decaying nuclei ( Mo) on electron emission and positron capture rates. Furthermore, we compare the neutron capture rates and stellar beta decay rates. It is found that neutron capture rates are higher than stellar beta decay rates at both lower and higher temperatures.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-31DOI: 10.1088/1674-1137/ad53b8
Ning Wang, 宁 王, Min Liu and 敏 刘
Based on the Weizsäcker-Skyrme (WS4) mass model, the fission barriers of nuclei are systematically studied. Considering the shell corrections, macroscopic deformation energy, and a phenomenological residual correction, the fission barrier heights for nuclei with can be well described, with an rms deviation of 0.481 MeV with respect to 71 empirical barrier heights. In addition to the shell correction at the ground state, the shell correction at the saddle point and its relative value are also important for both deformed and spherical nuclei. The fission barriers for nuclei far from the -stability line and super-heavy nuclei are also predicted with the proposed approach.
{"title":"Fission barriers with the Weizsäcker-Skyrme mass model*","authors":"Ning Wang, 宁 王, Min Liu and 敏 刘","doi":"10.1088/1674-1137/ad53b8","DOIUrl":"https://doi.org/10.1088/1674-1137/ad53b8","url":null,"abstract":"Based on the Weizsäcker-Skyrme (WS4) mass model, the fission barriers of nuclei are systematically studied. Considering the shell corrections, macroscopic deformation energy, and a phenomenological residual correction, the fission barrier heights for nuclei with can be well described, with an rms deviation of 0.481 MeV with respect to 71 empirical barrier heights. In addition to the shell correction at the ground state, the shell correction at the saddle point and its relative value are also important for both deformed and spherical nuclei. The fission barriers for nuclei far from the -stability line and super-heavy nuclei are also predicted with the proposed approach.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Heavy neutral leptons N are the most appealing candidates to generate tiny neutrino masses. We studied the signature of heavy neutral leptons in gauged at a muon collider. Charged under the symmetry, the heavy neutral leptons can be pair produced via the new gauge boson at the muon collider as and . We then performed a detailed analysis on the lepton number violation signature and at the 3 TeV muon collider, where the hadronic decays of W boson are treated as fat-jets J. These lepton number violation signatures have quite clean backgrounds at the muon collider. Our simulation shows that a wide range of viable parameter space is within the reach of the 3 TeV muon collider. For instance, with new gauge coupling and an integrated luminosity of 1000 fb , the signal could probe TeV. Meanwhile, if the gauge boson mass satisfies , the signature would be more promising than the signature.
重中性轻子 N 是产生微小中微子质量的最有吸引力的候选粒子。我们在μ介子对撞机上研究了重中性轻子在规中的特征。根据对称性，重中性轻子可以在μ子对撞机上通过新的规玻色子成对产生，如 和 。我们随后详细分析了在 3 TeV μ介子对撞机上的轻子数违和特征，其中 W 玻色子的强子衰变被视为胖喷流 J。我们的模拟表明，3 TeV μ介子对撞机可以处理广泛的可行参数空间。例如，在新的规耦合和1000 fb的综合光度下，信号可以探测到TeV。同时，如果规玻色子质量满足 ，信号将比信号更有希望。
{"title":"Heavy neutral leptons in gauged U(1) L µ −L τ at muon collider*","authors":"Ru-Yi He, 如意 何, Jia-Qi Huang, 佳琪 黄, Jin-Yuan Xu, 金源 许, Fa-Xin Yang, 法新 杨, Zhi-Long Han, 志龙 韩, Feng-Lan Shao and 凤兰 邵","doi":"10.1088/1674-1137/ad4d61","DOIUrl":"https://doi.org/10.1088/1674-1137/ad4d61","url":null,"abstract":"Heavy neutral leptons N are the most appealing candidates to generate tiny neutrino masses. We studied the signature of heavy neutral leptons in gauged at a muon collider. Charged under the symmetry, the heavy neutral leptons can be pair produced via the new gauge boson at the muon collider as and . We then performed a detailed analysis on the lepton number violation signature and at the 3 TeV muon collider, where the hadronic decays of W boson are treated as fat-jets J. These lepton number violation signatures have quite clean backgrounds at the muon collider. Our simulation shows that a wide range of viable parameter space is within the reach of the 3 TeV muon collider. For instance, with new gauge coupling and an integrated luminosity of 1000 fb , the signal could probe TeV. Meanwhile, if the gauge boson mass satisfies , the signature would be more promising than the signature.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-31DOI: 10.1088/1674-1137/ad50aa
Sayantan Ghosh, Raja Solanki and P.K. Sahoo
In this article, we present a dynamical system analysis of a Dirac-Born-Infeld scalar field in a modified gravity context. We considered a polynomial form of modified gravity, used two different types of scalar potential, polynomial and exponential, and found a closed autonomous dynamical system of equations. We analyzed the fixed points of such a system and evaluated the conditions under which deceleration to late-time acceleration occurs in this model. We note the similarity of the two models and show that our result is consistent with a previous study on Einstein's gravity. We also investigated the phenomenological implications of our models by plotting EoS (ω), energy density (Ω), and deceleration parameter (q) w.r.t. to e-fold time and comparing to the present value. We conclude the paper by observing how the dynamical system analysis differs in the modified gravity, and present the future scope of our research.
在这篇文章中，我们对修正引力背景下的狄拉克-天生-因费尔德标量场进行了动力学系统分析。我们考虑了修正引力的多项式形式，使用了两种不同类型的标量势（多项式势和指数势），并发现了一个封闭的自主动力学方程组。我们分析了这一系统的定点，并评估了在这一模型中发生减速到晚期加速的条件。我们注意到这两个模型的相似性，并表明我们的结果与之前关于爱因斯坦引力的研究一致。我们还通过绘制 EoS（ω）、能量密度（Ω）和减速参数（q）与 e 倍时间的关系图并与现值比较，研究了模型的现象学意义。最后，我们观察了动力学系统分析在修正引力中的不同之处，并介绍了我们未来的研究范围。
{"title":"Dynamical system analysis of Dirac-Born-Infeld scalar field cosmology in coincident f(Q) gravity*","authors":"Sayantan Ghosh, Raja Solanki and P.K. Sahoo","doi":"10.1088/1674-1137/ad50aa","DOIUrl":"https://doi.org/10.1088/1674-1137/ad50aa","url":null,"abstract":"In this article, we present a dynamical system analysis of a Dirac-Born-Infeld scalar field in a modified gravity context. We considered a polynomial form of modified gravity, used two different types of scalar potential, polynomial and exponential, and found a closed autonomous dynamical system of equations. We analyzed the fixed points of such a system and evaluated the conditions under which deceleration to late-time acceleration occurs in this model. We note the similarity of the two models and show that our result is consistent with a previous study on Einstein's gravity. We also investigated the phenomenological implications of our models by plotting EoS (ω), energy density (Ω), and deceleration parameter (q) w.r.t. to e-fold time and comparing to the present value. We conclude the paper by observing how the dynamical system analysis differs in the modified gravity, and present the future scope of our research.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-31DOI: 10.1088/1674-1137/ad53ba
Yu-Shan Wang, 玉珊 王, Zhen-Ming Xu, 震明 许, Bin Wu and 滨 吴
Phase transition is important for understanding the nature and evolution of the black hole thermodynamic system. In this study, we predicted the phase transition of the third-order Lovelock black hole using the winding numbers in complex analysis, and qualitatively validated this prediction by the generalized free energy. For the 7
{"title":"Thermodynamic phase transition and winding number for the third-order Lovelock black hole*","authors":"Yu-Shan Wang, 玉珊 王, Zhen-Ming Xu, 震明 许, Bin Wu and 滨 吴","doi":"10.1088/1674-1137/ad53ba","DOIUrl":"https://doi.org/10.1088/1674-1137/ad53ba","url":null,"abstract":"Phase transition is important for understanding the nature and evolution of the black hole thermodynamic system. In this study, we predicted the phase transition of the third-order Lovelock black hole using the winding numbers in complex analysis, and qualitatively validated this prediction by the generalized free energy. For the 7<d<12-dimensional black holes in hyperbolic topology and the 7-dimensional black hole in spherical topology, the winding number obtained is three, which indicates that the system undergoes first-order and second-order phase transitions. For the 7<d<12-dimensional black holes in spherical topology, the winding number is four, and two scenarios of phase transitions exist, one involving a purely second-order phase transition and the other involving simultaneous first-order and second-order phase transitions. This result further deepens the research on black hole phase transitions using the complex analysis.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-31DOI: 10.1088/1674-1137/ad5ae4
Lu Feng, 露 冯, Tao Han, 涛 韩, Jing-Fei Zhang, 敬飞 张, Xin Zhang and 鑫 张
Cosmological observations can be used to weigh neutrinos, but this method is model-dependent, with results relying on the cosmological model considered. If we consider interactions between dark energy and dark matter, the neutrino mass constraints differ from those derived under the standard model. On the contrary, gravitational wave (GW) standard siren observations can measure absolute cosmological distances, helping to break parameter degeneracies inherent in traditional cosmological observations, thereby improving constraints on neutrino mass. This paper examines the constraints on neutrino mass within interacting dark energy (IDE) models and explores how future GW standard siren observations could enhance these results. For multi-messenger GW observations, we consider the joint observations of binary neutron star mergers by third-generation ground-based GW detectors and short γ-ray burst observations by missions similar to the THESEUS satellite project. Using current cosmological observations (CMB+BAO+SN), we obtain an upper limit on the neutrino mass in the IDE models of 0.15 (or 0.16) eV. With the inclusion of GW data, the upper limit on the neutrino mass improves to 0.14 eV. This indicates that in the context of IDE models, the improvement in neutrino mass constraints from GW observations is relatively limited. However, GW observations significantly enhance the constraints on other cosmological parameters, such as matter density parameter, the Hubble constant, and coupling strength between dark energy and dark matter.
宇宙学观测可以用来权衡中微子，但这种方法依赖于模型，其结果取决于所考虑的宇宙学模型。如果我们考虑暗能量和暗物质之间的相互作用，中微子质量约束就会与标准模型下得出的结果不同。相反，引力波（GW）标准海妖观测可以测量绝对宇宙学距离，有助于打破传统宇宙学观测中固有的参数退行性，从而改善对中微子质量的约束。本文研究了相互作用暗能量（IDE）模型中对中微子质量的约束，并探讨了未来的引力波标准海妖观测如何能够增强这些结果。对于多信使 GW 观测，我们考虑了第三代地基 GW 探测器对双中子星合并的联合观测，以及类似于 THESEUS 卫星项目的任务对短γ射线暴的观测。利用当前的宇宙学观测（CMB+BAO+SN），我们得到了 IDE 模型中微中子质量的上限为 0.15（或 0.16）eV。加入全球大气观测数据后，中微子质量上限提高到了 0.14 eV。这表明，在 IDE 模型中，GW 观测对中微子质量约束的改善是相对有限的。然而，GW 观测大大增强了对其他宇宙学参数的约束，如物质密度参数、哈勃常数以及暗能量和暗物质之间的耦合强度。
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