General Relativity and Gravitation最新文献_第10页

Exploring the phase transition in charged Gauss–Bonnet black holes: a holographic thermodynamics perspectives 探索带电高斯-波内特黑洞的相变：全息热力学视角

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-08-13 DOI: 10.1007/s10714-024-03285-x

Jafar Sadeghi, Mohammad Reza Alipour, Mohammad Ali S. Afshar, Saeed Noori Gashti

{"title":"Exploring the phase transition in charged Gauss–Bonnet black holes: a holographic thermodynamics perspectives","authors":"Jafar Sadeghi, Mohammad Reza Alipour, Mohammad Ali S. Afshar, Saeed Noori Gashti","doi":"10.1007/s10714-024-03285-x","DOIUrl":"10.1007/s10714-024-03285-x","url":null,"abstract":"<div><p>In this paper, we delve into the study of thermodynamics and phase transition of charged Gauss–Bonnet black holes within the context of anti-de Sitter space, with particular emphasis on the central charge’s role within the dual conformal field theory (CFT). We employ a holographic methodology that interprets the cosmological constant and the Newton constant as thermodynamic variables, leading to the derivation of a modified first law of thermodynamics that incorporates the thermodynamic volume and pressure. Our findings reveal that the central charge of the CFT is intrinsically linked to the variation of these constants, and its stability can be ensured by simultaneous adjustment of these constants. We further explore the phase structures of the black holes, utilizing the free energy. Our research uncovers the existence of a critical value of the central charge, beyond which the phase diagram displays a first-order phase transition between small and large black holes. We also delve into the implications of our findings on the complexity of the CFT. Our conclusions underscore the significant role of the central charge in the holographic thermodynamics and phase transition of charged Gauss–Bonnet black holes. Furthermore, we conclude that while the central charge considered provides suitable and satisfactory solutions for this black hole in 4 and 5 dimensions, it becomes necessary to introduce a unique central charge for this structure of modified gravity. In essence, the central charge in holographic thermodynamics is not a universal value and requires modification in accordance with different modified gravities. Consequently, the physics of the problem will significantly deviate from the one discussed in this article, indicating a rich and complex landscape for future work.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 8","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141980930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Killing invariants: an approach to the sub-classification of geometries with symmetry 基林不变式：对具有对称性的几何图形进行子分类的方法

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-08-10 DOI: 10.1007/s10714-024-03277-x

C. Brown, M. Gorban, W. Julius, R. Radhakrishnan, G. Cleaver, D. McNutt

引用次数: 0

Influence of the cosmological constant on (kappa )-deformed neutron star 宇宙常数对变形中子星的影响

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-08-08 DOI: 10.1007/s10714-024-03279-9

R. Bhagya, Diganta Parai, Harsha Sreekumar, Suman Kumar Panja

{"title":"Influence of the cosmological constant on (kappa )-deformed neutron star","authors":"R. Bhagya, Diganta Parai, Harsha Sreekumar, Suman Kumar Panja","doi":"10.1007/s10714-024-03279-9","DOIUrl":"10.1007/s10714-024-03279-9","url":null,"abstract":"<div><p>We study a model of the neutron star in <span>(kappa )</span>-deformed space-time in the presence of the cosmological constant (<span>(Lambda )</span>). The Einstein tensor and the energy-momentum tensor are generalized to <span>(kappa )</span>-deformed space-time and we construct the field equations with the cosmological constant. Considering the interior of the star to be a perfect fluid as in the commutative case, we find the Tolman–Oppenheimer–Volkoff equations with the inclusion of the cosmological constant in <span>(kappa )</span>-deformed space-time. The behavior of the maximum allowed mass of the star and its radius are studied with the variation in the cosmological constant as well as the deformation parameter. We see that the non-commutativity enhances the mass of the star and its maximum mass increases with a decrease in the cosmological constant. The maximum mass varies from 3.44 to <span>(3.68,text {M}_{odot })</span> as <span>(Lambda )</span> varies from <span>(10^{-10})</span> to <span>(10^{-15},text {m}^{-2})</span>. We also obtain the compactness factor and surface redshift of the star. We observe that the compactness of the star increases as the cosmological constant decreases, whereas the surface redshift of the star decreases with a decrease in the cosmological constant. The compactness factor and surface redshift corresponding to the maximum mass of the neutron star remains almost constant as <span>(Lambda )</span> decreases.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 8","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141909165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Localized chaos due to rotating shock waves in Kerr–AdS black holes and their ultraspinning version 克尔-AdS黑洞旋转冲击波引起的局部混沌及其超旋版本

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-07-29 DOI: 10.1007/s10714-024-03275-z

Hadyan Luthfan Prihadi, Freddy Permana Zen, Donny Dwiputra, Seramika Ariwahjoedi

{"title":"Localized chaos due to rotating shock waves in Kerr–AdS black holes and their ultraspinning version","authors":"Hadyan Luthfan Prihadi, Freddy Permana Zen, Donny Dwiputra, Seramika Ariwahjoedi","doi":"10.1007/s10714-024-03275-z","DOIUrl":"10.1007/s10714-024-03275-z","url":null,"abstract":"<div><p>The butterfly velocity of four-dimensional rotating charged asymptotically AdS black hole is calculated to probe chaos using localized rotating shock waves. In this work, we obtain the angular momentum dependence of the butterfly velocity due to rotation in the shock wave probes. In general, the angular momentum <span>(mathcal {L})</span> of the shock waves increases the butterfly velocity. The localized shocks also generate butterfly velocities which vanish when we approach extremality, indicating no entanglement spread near extremality. One of the butterfly velocity modes is well bounded by both the speed of light and the Schwarzschild-AdS result, while the other may become superluminal. Aside from the logarithmic behavior of the scrambling time which indicates chaos, the Lyapunov exponent is also positive and bounded by <span>(kappa =2pi T_H/(1-mu mathcal {L}))</span>. The Kerr–NUT–AdS and Kerr–Sen–AdS solutions and their ultraspinning versions are used as examples to attain a better understanding of the chaotic phenomena in rotating black holes, especially those with extra conserved charges.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 8","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141791043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Elementary considerations on gravitational waves from hyperbolic encounters 关于双曲遭遇引力波的基本考虑

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-07-27 DOI: 10.1007/s10714-024-03276-y

Martin Teuscher, Aurélien Barrau, Killian Martineau

引用次数: 0

Approximating photon trajectories in spherically symmetric spacetimes 球对称时空中的光子轨迹近似图

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-07-24 DOI: 10.1007/s10714-024-03274-0

Joseph Sultana

引用次数: 0

Exponential correction to Friedmann equations 弗里德曼方程的指数修正

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-07-18 DOI: 10.1007/s10714-024-03273-1

Özgür Ökcü, Ekrem Aydiner

引用次数: 0

Some remarks on Bardeen-AdS black hole surrounded by a fluid of strings 关于被弦流体包围的巴丁-AdS 黑洞的几点评论

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-07-12 DOI: 10.1007/s10714-024-03268-y

F. F. Nascimento, Pedro H. Morais, J. M. Toledo, V. B. Bezerra

{"title":"Some remarks on Bardeen-AdS black hole surrounded by a fluid of strings","authors":"F. F. Nascimento, Pedro H. Morais, J. M. Toledo, V. B. Bezerra","doi":"10.1007/s10714-024-03268-y","DOIUrl":"10.1007/s10714-024-03268-y","url":null,"abstract":"<div><p>We obtain a class of solutions that correspond to a generalization of the Bardeen black hole solution by solving the Einstein equations coupled to a particular nonlinear electromagnetic field. The generalization is realized by considering, additionally, the presence of the cosmological constant and a source corresponding to an anisotropic fluid, namely, a fluid of strings, which surrounds the black hole. We show that the obtained class of solutions preserve or not the regularity of the original Bardeen black hole solution, depending on the values of the parameter <span>(beta )</span> which labels the different solutions. We discuss the characteristics of the solutions, from the point of view of the singularities of the spacetime, by examining the behavior of the Kretschmann scalar as well as of the geodesics with respect to their completeness. We analyze some aspects of the thermodynamics, particularizing to one of the solutions obtained, namely, for <span>(beta = nicefrac {-1}{2})</span>, in which case the regularity of Bardeen black hole is preserved. We also show that there is an incompatibility between the temperature arising from the first law of the black hole thermodynamics and the one using the surface gravity. Some thermodynamic quantities are obtained and analyzed, as for example, pressure, heat capacity, and the critical points, and we show how these quantities change for different values of the parameter <i>q</i> associated with the original Bardeen solution, as well as with the parameter <i>b</i> associated with the presence of the fluid of strings. The phase transitions are also analyzed by using the equation of state and the Helmholtz free energy.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 7","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141597278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

4D Einstein–Gauss–Bonnet cosmology with Chameleon mechanism 具有变色龙机制的四维爱因斯坦-高斯-波纳宇宙学

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-07-08 DOI: 10.1007/s10714-024-03270-4

Andronikos Paliathanasis

引用次数: 0

The d’Alembert solution in hyperboloidal foliations 双曲面中的达朗贝尔解法

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-07-08 DOI: 10.1007/s10714-024-03272-2

Juan A. Valiente Kroon, Lidia J. Gomes Da Silva

引用次数: 0