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Thermodynamics of charged rotating black strings in extended phase space 扩展相空间中带电旋转黑弦的热力学
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-06-26 DOI: 10.1007/s10714-025-03441-x
Hamid R. Bakhtiarizadeh
{"title":"Thermodynamics of charged rotating black strings in extended phase space","authors":"Hamid R. Bakhtiarizadeh","doi":"10.1007/s10714-025-03441-x","DOIUrl":"10.1007/s10714-025-03441-x","url":null,"abstract":"<div><p>We investigate the thermodynamics of asymptotically Anti-de Sitter charged and rotating black strings in extended phase space, in which the cosmological constant is interpreted as thermodynamic pressure and the thermodynamic volume is defined as its conjugate. We find the thermodynamic volume, the internal energy, and the Smarr law. We study the thermal stability and show that some of the solutions have positive specific heat, which makes them thermodynamically stable. We find, for the first time, there is a critical point for charged solutions which occurs at the point of divergence of specific heat at constant pressure. This supports the existence of a second-order phase transition analogous to the liquid-gas critical point in Van der Waals fluids. We also study the maximal efficiency of a Penrose process and find that an extremal rotating black string can have an efficiency of up to 50%. We also find the equation of state for uncharged solutions. By comparing with the liquid-gas system, we observe that there is not a critical behavior to coincide with those of the Van der Waals system.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 7","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924605","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
Quantum tunneling driven by quintessence and the role of GUP 精粹驱动的量子隧穿与GUP的作用
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-06-24 DOI: 10.1007/s10714-025-03440-y
Sauvik Sen
{"title":"Quantum tunneling driven by quintessence and the role of GUP","authors":"Sauvik Sen","doi":"10.1007/s10714-025-03440-y","DOIUrl":"10.1007/s10714-025-03440-y","url":null,"abstract":"<div><p>In this paper, we studied quantum tunneling of massless and massive particles pertaining to a Schwarzschild black hole in a quintessence background, and explored the consequences emerging from a generalized uncertainty principle (GUP). For the quintessence scenario, we considered two specific cases of <i>w</i>, which is the ratio of the pressure and energy density, namely <span>(w=-1/3)</span> and <span>(w=-2/3)</span>. For the GUP, we used a modified Schwarzschild metric and employed a unique choice of contour integration to compute the tunneling amplitudes. An analysis and comparative study of the respective temperature profiles has been made. The energy emission rate has also been analysed.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924640","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
Probing the one-loop quantum correction on the Schwarzschild black hole with the gravitational lensing images of a point-like source 用点状源的引力透镜图像探测史瓦西黑洞的单圈量子修正
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-06-24 DOI: 10.1007/s10714-025-03439-5
Ding-Long Cao, Yuan-Xing Gao, Yi Xie
{"title":"Probing the one-loop quantum correction on the Schwarzschild black hole with the gravitational lensing images of a point-like source","authors":"Ding-Long Cao,&nbsp;Yuan-Xing Gao,&nbsp;Yi Xie","doi":"10.1007/s10714-025-03439-5","DOIUrl":"10.1007/s10714-025-03439-5","url":null,"abstract":"<div><p>The one-loop quantum corrections of General Relativity contribute to understand its ultraviolet completion and can be tested by directly imaging the supermassive black hole in our Galactic center. In this work, we analytically investigate the weak deflection gravitational lensing of the one-loop quantum corrected Schwarzschild spacetime that is characterized by a normalized quantum correction parameter <span>(lambda )</span>, and discuss the detectability of its weak deflection lensing observables. We find that these observables have the potential to be measured but their deviations from those of a Schwarzschild black hole can not be distinguished due to current limited resolution. To gain deeper insights into the quantum nature, we further study the strong deflection gravitational lensing analytically. According to the shadow measurement of Sgr A* by the Event Horizon Telescope, we obtain a constraint on <span>(lambda )</span> and demonstrate that the strong deflection lensing observables such as the angular separation, brightness difference and time delay of the relativistic images are beyond the reach of present capacity in this allowable range. Consequently, identifying the quantum effects around such a corrected Schwarzschild spacetime with gravitational lensing is not feasible at current stage.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924606","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
Black Holes as Laboratories: Tests of General Relativity 黑洞作为实验室：广义相对论的检验。
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-06-22 DOI: 10.1007/s10714-025-03437-7
Ruth Gregory, Samaya Nissanke
{"title":"Black Holes as Laboratories: Tests of General Relativity","authors":"Ruth Gregory,&nbsp;Samaya Nissanke","doi":"10.1007/s10714-025-03437-7","DOIUrl":"10.1007/s10714-025-03437-7","url":null,"abstract":"<div><p>We briefly overview the case for using black holes as a discriminator for theories of gravity. The opportunities and challenges for the various observational experiments are outlined, and key questions for the community identified. This note summarises the discussion from the roundtable on the third day of <i>Black Holes Inside and Out</i>.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03437-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144478641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Compactification of anisotropies in Einstein-Scalar-Gauss-Bonnet cosmology 爱因斯坦-标量-高斯-邦纳宇宙论中各向异性的紧化
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-06-13 DOI: 10.1007/s10714-025-03436-8
Alex Giacomini, Andronikos Paliathanasis, Alexey Toporensky
{"title":"Compactification of anisotropies in Einstein-Scalar-Gauss-Bonnet cosmology","authors":"Alex Giacomini,&nbsp;Andronikos Paliathanasis,&nbsp;Alexey Toporensky","doi":"10.1007/s10714-025-03436-8","DOIUrl":"10.1007/s10714-025-03436-8","url":null,"abstract":"<div><p>We investigate the evolution of anisotropies in Einstein-Gauss-Bonnet theory with a scalar field coupled to the Gauss-Bonnet term. Specifically, we examine the simplest scenario in which the scalar field lacks a kinetic term, and its kinetic contribution arises from an integration by parts of the Gauss-Bonnet scalar. We consider four- and five-dimensional anisotropic spacetimes, focusing on Bianchi I and extended Bianchi I geometries. Our study reveals that the asymptotic solutions correspond to locally symmetric spacetimes where at least two scale factors exhibit analogous behavior or, alternatively, to isotropic configurations where all scale factors evolve identically. Additionally, we discuss the effects of a cosmological constant, finding that the presence of the cosmological constant does not lead to an isotropic universe.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03436-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Very long baseline interferometry as a precision strong gravity instrument 超长基线干涉测量作为一种精密强重力仪器
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-06-06 DOI: 10.1007/s10714-025-03429-7
Paul Tiede
{"title":"Very long baseline interferometry as a precision strong gravity instrument","authors":"Paul Tiede","doi":"10.1007/s10714-025-03429-7","DOIUrl":"10.1007/s10714-025-03429-7","url":null,"abstract":"<div><p>We are entering the era of precision black hole astronomy. Thanks to gravitational wave interferometers like LIGO-Virgo-KAGRA and potential first-generation space-based detectors like LISA, the next few decades will provide direct gravitational probes of supermassive black holes at horizon scales. However, gravitational wave detectors are not alone. Thanks to the unprecedented resolution of very-long-baseline interferometry (VLBI) instruments like the Event Horizon Telescope and potential space extensions like the Black Hole Explorer, black hole horizon-scale features (e.g., the photon sphere and inner shadow) are expected to come into focus within the next decade. In this letter, we will highlight the potential for precision measurements of black holes using VLBI and how it can provide an independent probe of these objects.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924645","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
Gravitational field and lensing of a circular chiral vorton 圆形手性涡的引力场和透镜效应
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-06-05 DOI: 10.1007/s10714-025-03416-y
Leonardus B. Putra, H. S. Ramadhan
{"title":"Gravitational field and lensing of a circular chiral vorton","authors":"Leonardus B. Putra,&nbsp;H. S. Ramadhan","doi":"10.1007/s10714-025-03416-y","DOIUrl":"10.1007/s10714-025-03416-y","url":null,"abstract":"<div><p>We derive the metric of a circular chiral vorton in the weak field limit. The object is self-supporting by means of its chiral current. A conical singularity with deficit angle, identical to that of straight string with the same linear mass density, is present at the vorton’s core. We find that the metric is akin to the electromagnetic 4-potential of a circular current wire loop, illustrating the concept of gravito-electromagnetism. Surprisingly we find that the solution asymptotically mimics a Kerr-like naked singularity with mass <span>(M_v=4pi Rmu )</span> and spin parameter <span>(a=R/2)</span>. Finally, we also simulate the gravitational lensing images by solving the corresponding null geodesic equations. This reveals interesting properties of the images, such as the simultaneous creation of a minimally distorted source image and its Einstein ring, as well as the formation of double images on the back side of the ring.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03416-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hyperboloidal initial data without logarithmic singularities 无对数奇点的双曲面初始数据
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-06-05 DOI: 10.1007/s10714-025-03424-y
Károly Csukás, István Rácz
{"title":"Hyperboloidal initial data without logarithmic singularities","authors":"Károly Csukás,&nbsp;István Rácz","doi":"10.1007/s10714-025-03424-y","DOIUrl":"10.1007/s10714-025-03424-y","url":null,"abstract":"<div><p>Andersson and Chruściel showed that generic asymptotically hyperboloidal initial data sets admit polyhomogeneous expansions, and that only a non-generic subclass of solutions of the conformal constraint equations is free of logarithmic singularities. The purpose of this work is twofold. First, within the evolutionary framework of the constraint equations, we show that the existence of a well-defined Bondi mass brings the asymptotically hyperboloidal initial data sets into a subclass whose Cauchy development guaranteed to admit a smooth boundary, by virtue of the results of Andersson and Chruściel. Second, by generalizing a recent result of Beyer and Ritchie, we show that the existence of well-defined Bondi mass and angular momentum, together with some mild restrictions on the free data, implies that the generic solutions of the parabolic-hyperbolic form of the constraint equations are completely free of logarithmic singularities. We also provide numerical evidence to show that in the vicinity of Kerr, asymptotically hyperboloidal initial data without logarithmic singularities can indeed be constructed.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03424-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Onset of dark energy from cosmological scalarization and gravitational wave speed 暗能量从宇宙尺度化和引力波速度开始
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-06-04 DOI: 10.1007/s10714-025-03431-z
H. Mohseni Sadjadi
{"title":"Onset of dark energy from cosmological scalarization and gravitational wave speed","authors":"H. Mohseni Sadjadi","doi":"10.1007/s10714-025-03431-z","DOIUrl":"10.1007/s10714-025-03431-z","url":null,"abstract":"<div><p>This study investigates the emergence of dark energy during the matter-dominated era through spontaneous cosmological scalarization in the scalar-Ricci-Gauss-Bonnet model. Our model aligns with the conjecture that the speed of gravitational waves at low redshifts is nearly equal to the speed of light, implying that the Gauss-Bonnet invariant does not directly contribute to late-time acceleration and suggesting that scalarization begins in the radiation-dominated era. The Gauss-Bonnet coupling stabilizes the quintessence field at an initial fixed point with negligible dark energy density during the radiation era. As the Universe expands, the Ricci coupling induces a tachyonic transition in the quintessence field, driving the evolution of dark energy.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924648","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
Dynamics of geometric invariants in the asymptotically hyperboloidal setting: energy and linear momentum 渐近双曲环境中几何不变量的动力学：能量和线性动量
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-06-03 DOI: 10.1007/s10714-025-03427-9
Anna Sancassani, Saradha Senthil Velu
{"title":"Dynamics of geometric invariants in the asymptotically hyperboloidal setting: energy and linear momentum","authors":"Anna Sancassani,&nbsp;Saradha Senthil Velu","doi":"10.1007/s10714-025-03427-9","DOIUrl":"10.1007/s10714-025-03427-9","url":null,"abstract":"<div><p>We investigate the evolution of geometric invariants, as defined by Michel [1], in the context of asymptotically hyperboloidal initial data sets. Our focus lies on the charges of energy and linear momentum, and we study their behavior under the Einstein evolution equations. We construct foliations describing the evolution of asymptotically hyperboloidal initial data sets using hyperboloidal time function. We define E-P chargeability as a property of the initial data set, and we show that it is preserved under the evolution for our choice of time function. This ensures that the charges are well-defined along the evolution, which is crucial for our approach. Along such foliations, we recover the same energy-loss and linear momentum-loss formulae as those derived by Bondi, Sachs, and Metzner [2] while operating under weaker asymptotic assumptions. Our approach is distinct from previous work as we do not utilize conformal compactifications and work directly at the level of the initial data set.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03427-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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