General Relativity and Gravitation最新文献

{"title":"Entropy correction and quasinormal modes of slowly rotating Kerr–Newman–de Sitter-like black hole in bumblebee gravity","authors":"Ningthoujam Media,&nbsp;Y. Priyobarta Singh,&nbsp;Y. Onika Laxmi,&nbsp;T. Ibungochouba Singh","doi":"10.1007/s10714-025-03414-0","DOIUrl":"10.1007/s10714-025-03414-0","url":null,"abstract":"<div><p>In this paper, we study the tunneling of fermion particle for slowly rotating Kerr–Newman–de Sitter-like (KNdS-like) black hole in bumblebee gravity model by applying the generalized uncertainty principle (GUP). The Hawking temperature of slowly rotating KNdS-like black hole has been modified under GUP. The quantum gravity effect reduces the rise of Hawking temperature of slowly rotating KNdS-like black hole. The modified Hawking temperature and the correction of black hole entropy are investigated by using the tunneling of fermion beyond the semiclassical approximation. We study the scalar field perturbation and effective potential of slowly rotating KNdS-like black hole in bumblebee gravity model by using Klein–Gördon equation. The quasinormal modes for scalar perturbation is investigated using WKB approximation method and Pöschl–Teller fitting method. The significant impact on the greybody factor, Hawking spectra and sparsity of Hawking radiation of the black hole are also studied in the presence of Lorentz violating parameter <i>L</i>.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932343","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}

{"title":"Hyperboloidal approach for linear and non-linear wave equations in FLRW spacetimes","authors":"Flavio Rossetti,&nbsp;Alex Vaño-Viñuales","doi":"10.1007/s10714-025-03409-x","DOIUrl":"10.1007/s10714-025-03409-x","url":null,"abstract":"<div><p>In this numerical work, we deal with two distinct problems concerning the propagation of waves in cosmological backgrounds. In both cases, we employ a spacetime foliation given in terms of compactified hyperboloidal slices. These slices intersect <img>\u0000\u0000\u0000\u0000, so our method is well-suited to study the long-time behaviour of waves. Moreover, our construction is adapted to the presence of the time–dependent scale factor that describes the underlying spacetime expansion. First, we investigate decay rates for solutions to the linear wave equation in a large class of expanding FLRW spacetimes, whose non–compact spatial sections have either zero or negative curvature. By means of a hyperboloidal foliation, we provide new numerical evidence for the sharpness of decay–in–time estimates for linear waves propagating in such spacetimes. Then, in the spatially-flat case, we present numerical results in support of small data global existence of solutions to semi-linear wave equations in FLRW spacetimes having a decelerated expansion, provided that a generalized null condition holds. In absence of this null condition and in the specific case of <span>( square _g phi = (partial _t phi )^2 )</span> (Fritz John’s choice), the results we obtain suggest that, when the spacetime expansion is sufficiently slow, solutions diverge in finite time for every choice of initial data.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932344","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}

{"title":"Black hole evaporation – 50 years","authors":"William G. Unruh","doi":"10.1007/s10714-025-03391-4","DOIUrl":"10.1007/s10714-025-03391-4","url":null,"abstract":"<div><p>Personal reflections (this is not a scholarly history but my own memories and work on this topic). I apologize beforehand to everyone whose work I do not mention. Note that there is lots of such work, much brilliant. [This document is a transcription of the slides used at the conference, and as a result is rather rough as a document.]</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03391-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927282","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}

{"title":"Restricted phase space thermodynamics of dyonic AdS black holes: comparative analysis using different entropy models","authors":"Abhishek Baruah,&nbsp;Prabwal Phukon","doi":"10.1007/s10714-025-03413-1","DOIUrl":"10.1007/s10714-025-03413-1","url":null,"abstract":"<div><p>Using the restricted phase space (RPST) formalism, we perform a comparative study of 4D dyonic AdS black hole thermodynamics in Gibbs–Boltzmann statistics and Rényi statistics. In RPST formalism, instead of pressure and volume, one considers central charge <i>C</i> and chemical potential <span>(mu )</span> as thermodynamic variables. Inclusion of the magnetic charge <span>(tilde{Q}_m)</span> gives rise to a richer phase structure of the study of thermodynamics by adding a non-equilibrium transition from an unstable small black hole to a stable black hole in the <i>T</i>–<i>S</i> processes and a Hawking–Page and Davies type phase transition in the <i>F</i>–<i>T</i> and specific heat plots on top of the Van der Waals and superfluid <span>(lambda )</span> phase transitions. We study an extra mixed ensemble (<span>(tilde{Phi }_e,tilde{Q}_m))</span> due to the inclusion of <span>(tilde{Q}_m)</span> where we see Van der Waals phase transition and whose plots change as the entropy model changes meaning for isovoltage processes we see Hawking–Page transition in Bekenstein–Hawking entropy and absence of Hawking–Page in Rényi entropy construct. We observe an interesting phenomenon where changing the Rényi parameter <span>(lambda )</span>, the <i>T</i>–<i>S</i> process changes the same way as when varying the central charge <i>C</i> underlining some similarity that is not seen in the Bekenstein Hawking entropy model. We observe a similarity between the plots when both charges are turned off relating to the Schwarzschild black hole and the grand-canonical ensemble. One can observe that as the entropy models are changed, the homogeneity is not lost where the mass as a function of extensive variables is of order one and the rest zero. We see a similarity in the <span>(mu )</span>–<i>C</i> process across the entropy models signally some universality across entropy models as well as different types of black holes studied before. Finally, we do not see a new universality class for modified entropy as it is seen in studies done for alternate gravity models.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902744","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}

{"title":"Black hole spectroscopy: status report","authors":"Gregorio Carullo","doi":"10.1007/s10714-025-03408-y","DOIUrl":"10.1007/s10714-025-03408-y","url":null,"abstract":"<div><p>A brief overview of the “Black hole spectroscopy program” status is presented. Albeit given from a personal angle, it constitutes an attempt to convey the impressive progress achieved within the field in the last few years. Modeling and observational aspects are touched upon, although both from an observationally-oriented perspective. Particular emphasis is given to recent advancements within general relativity and challenging open problems.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03408-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143884311","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}

{"title":"Bridging time across null horizons","authors":"Anıl Zenginoğlu","doi":"10.1007/s10714-025-03410-4","DOIUrl":"10.1007/s10714-025-03410-4","url":null,"abstract":"<div><p>General relativity, as a diffeomorphism-invariant theory, allows the description of physical phenomena in a wide variety of coordinate systems. In the presence of boundaries, such as event horizons and null infinity, time coordinates must be carefully adapted to the global causal structure of spacetime to ensure a computationally efficient description. Horizon-penetrating time is used to describe the dynamics of infalling matter and radiation across the event horizon, while hyperboloidal time is used to study the propagation of radiation toward the idealized observer at null infinity. In this paper, we explore the historical and mathematical connection between horizon-penetrating and hyperboloidal time coordinates, arguing that both classes of coordinates are simply regular choices of time across null horizons. We review the height-function formalism in stationary spacetimes, providing examples that may be useful in computations, such as source-adapted foliations or Fefferman–Graham–Bondi coordinates near null infinity. We discuss bridges connecting the boundaries of spacetime through a time hypersurface across null horizons, including the event horizon, null infinity, and the cosmological horizon.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03410-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143880828","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}

{"title":"Linear frame dragging along one spatial dimension","authors":"Marco Alberto Javarone,&nbsp;Luciano Pietronero","doi":"10.1007/s10714-025-03407-z","DOIUrl":"10.1007/s10714-025-03407-z","url":null,"abstract":"<div><p>Inertial dragging is a well-known effect described within the framework of General Relativity. Notwithstanding, some fundamental questions related to its nature still deserve attention. One of these, rooted in Mach’s principle, wonders whether the inertial mass of particles could be due to the relative motion with respect to other particles. To tackle this question, we study the inertial dragging resulting in a test particle located in the centre of mass of two faraway masses accelerating in the same direction. In this simple setup, calculations show the appearance of an inertial force, which entails the test particle accelerating in the opposite direction. Therefore, the proposed model shows that relative accelerations of distant masses with respect to a test particle induce inertial dragging effects which are similar to the inertia corresponding to an acceleration of the test particle itself. This could be suggestive of a more concrete interpretation of Mach’s principle which would imply that the gravitational constant may be the approximate value of a more complex inertial field.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877900","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}

{"title":"Black holes galore in (D>4)","authors":"Roberto Emparan","doi":"10.1007/s10714-025-03398-x","DOIUrl":"10.1007/s10714-025-03398-x","url":null,"abstract":"<div><p>The black hole solutions to Einstein’s vacuum equations in four dimensions contain just one example: the Kerr black hole. Over the past two decades, we have understood that higher-dimensional black holes are far more plentiful. I give a straightforward account of the reasons for this abundance based on three key ideas: (i) Horizons in <span>(D&gt;4)</span> can be long. (ii) Long horizons are flexible. (iii) Long horizons are unstable. I conclude with some comments and conjectures about the classification problem.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03398-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871427","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}

{"title":"Gravitational collapse in higher-dimensional Rastall gravity with and without cosmological constant","authors":"Golfin Ekatria,&nbsp;Andy Octavian Latief,&nbsp;Fiki Taufik Akbar,&nbsp;Bobby Eka Gunara","doi":"10.1007/s10714-025-03406-0","DOIUrl":"10.1007/s10714-025-03406-0","url":null,"abstract":"<div><p>We consider a spherically symmetric homogeneous perfect fluid undergoing a gravitational collapse to singularity in the framework of higher-dimensional Rastall gravity in the cases of vanishing and nonvanishing cosmological constants. The possible final states of the collapse in any finite dimension are black hole and naked singularity, but the naked singularity formation becomes less favored when the dimension is increased. We find that there are two physically distinct solutions for the collapse evolution in the case of nonzero cosmological constant: trigonometric and exponential solutions. The effective energy density of the fluid is decreasing (increasing) in the former (latter) when the magnitude of the cosmological constant is increased, which implies that the former undergoes a slower collapse than the latter. Furthermore, we find that a temporary trapped surface is possible to emerge in the case of trigonometric solution in the naked singularity region only. Therefore, distant observers with observational time shorter than the collapse duration may conclude that a black hole is formed, although the collapse will eventually lead to a naked singularity formation.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850898","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}

{"title":"Null geodesics in the static black bottle spacetime","authors":"Hexiang Chang","doi":"10.1007/s10714-025-03404-2","DOIUrl":"10.1007/s10714-025-03404-2","url":null,"abstract":"<div><p>This research analyses the spacetime geometry of the static black bottle by studying the geodesic motion of photons. Geodesic equations are found using the Hamilton–Jacobi formalism. The geodesics are then classified based on a set of appropriate conserved physical quantities. Effective potentials are used to visualise the allowed orbits. The classifications also vary based on the acceleration parameter of the spacetime. Analytical solutions are found using the Jacobi elliptic functions of the first and second kinds, <span>({{,textrm{sn},}}(u,m), {{,textrm{cn},}}(u,m))</span>. The geodesics are then visualised using isometric embedding alongside the horizons of the black bottle.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845610","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}