Classical and Quantum Gravity最新文献

Extremalization approach to black hole thermodynamics: perturbations around higher-derivative gravities 黑洞热力学的极值化方法：高导数引力周围的扰动

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-28 DOI: 10.1088/1361-6382/ae60c0

Aonan Zhang, Qiang Wang and Yong Xiao

{"title":"Extremalization approach to black hole thermodynamics: perturbations around higher-derivative gravities","authors":"Aonan Zhang, Qiang Wang and Yong Xiao","doi":"10.1088/1361-6382/ae60c0","DOIUrl":"https://doi.org/10.1088/1361-6382/ae60c0","url":null,"abstract":"When higher-derivative terms are added to a gravitational action, black hole solutions and their thermodynamic properties are generally corrected. Recent progress has shown that, by treating higher-derivative operators as perturbations, the first-order corrections to black hole thermodynamics can be obtained without explicit knowledge of the corresponding perturbed black hole solutions. This result can be understood as a consequence of an extremalization principle underlying the Euclidean action formulation of black hole thermodynamics. In this paper, we emphasize that this extremalization approach is not restricted to perturbations around Einstein gravity. Instead, it can be applied to perturbations of more general higher-derivative gravity theories whose black hole solutions are already known and can be taken as the zeroth-order background. As an explicit illustration, we consider Einstein–Gauss–Bonnet gravity as the zeroth-order theory and study the first-order thermodynamic corrections induced by further higher-order curvature operators. We show that these corrections can be derived without solving the perturbed black hole solutions, both in asymptotically flat and asymptotically AdS spacetimes.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"7 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147755078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 entropy 引力熵

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-28 DOI: 10.1088/1361-6382/ae60de

Sangmin Choi and Malcolm J Perry

引用次数: 0

Investigating the accelerated expansion of the Universe through updated constraints on viable f(R) models within the Palatini formalism 通过帕拉蒂尼形式主义中可行f(R)模型的更新约束来研究宇宙的加速膨胀

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-26 DOI: 10.1088/1361-6382/ae5d7a

Kumar Ravi

{"title":"Investigating the accelerated expansion of the Universe through updated constraints on viable f(R) models within the Palatini formalism","authors":"Kumar Ravi","doi":"10.1088/1361-6382/ae5d7a","DOIUrl":"https://doi.org/10.1088/1361-6382/ae5d7a","url":null,"abstract":"The observed accelerated expansion of the Universe at present epoch can be explained by some of the f(R) models without invoking the existence of dark energy or any other such exotic component in cosmic fluid. The f(R) models in Palatini formalism is relatively less explored in recent times with respect to their counterpart in metric formalism. We study seven f(R) models in Palatini formalism: Hu–Sawicki (two cases), Starobinsky, exponential, Tsujikawa, , and . Following standard statistical procedure and utilizing data sets: type Ia supernovae data, cosmic chronometer observations, baryonic acoustic oscillations data, data from H ii starburst galaxies, local measurements of the Hubble parameter (H0), and distance priors of cosmic microwave background radiation data, we obtain constraints on the model parameters. When compared with the standard ‘Lambda–cold dark matter model’, for many data set combinations, the support for f(R) models is significant. We obtain the relevant quantities for characterizing the accelerated expansion of the Universe, and these quantities are consistent with those obtained in a model-independent way by others. The curve of effective/total equation- of-state parameter, obtained from parameter constraints, clearly shows correct phases of the expansion history: the radiation-dominated epochs and the matter-dominated epochs, of the past, and the current accelerated expansion epoch eventually evolving to de-Sitter phase in the distant future. Overall, our results advocate in favour of pursuing f(R) models in Palatini formalism as a potential alternative for explaining accelerated expansion of the Universe.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"144 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147751743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Josephson frequency shift near magnetized objects in slowly rotating spacetime 慢旋转时空中磁化物体附近的约瑟夫森频移

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-26 DOI: 10.1088/1361-6382/ae5d1e

Aytimbetov Nurmukhammed, Mardon Abdullaev, Javlon Rayimbaev and Bobomurat Ahmedov

引用次数: 0

Boundary-only weak deflection angles from isothermal optical geometry 等温光学几何中仅限边界的弱偏转角

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-23 DOI: 10.1088/1361-6382/ae5d7b

Ali Övgün and Reggie C Pantig

{"title":"Boundary-only weak deflection angles from isothermal optical geometry","authors":"Ali Övgün and Reggie C Pantig","doi":"10.1088/1361-6382/ae5d7b","DOIUrl":"https://doi.org/10.1088/1361-6382/ae5d7b","url":null,"abstract":"We develop a boundary only method for computing weak gravitational deflection angles at finite source and receiver distances within the Gauss–Bonnet theorem formulation of optical geometry. Exploiting the fact that the relevant equatorial optical manifold is two dimensional, we introduce isothermal (conformal) coordinates in which the optical metric is locally conformal to a flat reference metric and the Gaussian curvature reduces to a Laplacian of the conformal factor. Such an identity converts the curvature area term in the Gauss–Bonnet theorem into a pure boundary contribution via Green/Stokes-type relations, yielding a deflection formula that depends only on boundary data and controlled closure terms. The residual normalization freedom of the isothermal radius is isolated as an additive freedom in the conformal factor and is shown to leave physical observables invariant, eliminating the need for orbit dependent calibration prescriptions. We explicitly implement the boundary only formalism in weak deflection, where the leading bending reduces to elementary one-dimensional integrals evaluated on a flat reference ray in the conformal plane, with finite distance dependence entering solely through endpoint data. We validate the construction by reproducing finite distance weak deflection for Schwarzschild, deriving the leading finite distance charge correction for Reissner-Nordström, and applying the same boundary only framework to the Kottler (Schwarzschild-de Sitter) geometry as a representative non-asymptotically flat test case, recovering the standard finite distance expansion including the explicit and mixed contributions to the total deflection angle.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"4 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147739646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 lensing beyond the eikonal approximation 超越eikonal近似的引力透镜

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-22 DOI: 10.1088/1361-6382/ae5d7c

Emma Bruyère and Cyril Pitrou

引用次数: 0

Finite curvature construction of regular black holes and quasinormal mode analysis 正则黑洞的有限曲率构造及拟正态模态分析

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-22 DOI: 10.1088/1361-6382/ae5d7d

Chen Lan, Zhen-Xiao Zhang and Hao Yang

{"title":"Finite curvature construction of regular black holes and quasinormal mode analysis","authors":"Chen Lan, Zhen-Xiao Zhang and Hao Yang","doi":"10.1088/1361-6382/ae5d7d","DOIUrl":"https://doi.org/10.1088/1361-6382/ae5d7d","url":null,"abstract":"We develop a class of regular black holes by prescribing finite curvature invariants and reconstructing the corresponding spacetime geometry. Two distinct approaches are employed: one based on the Ricci scalar and the other on the Weyl scalar. In each case, we explore a variety of analytic profiles for the curvature functions, including Gaussian, hyperbolic secant, and rational forms, ensuring regularity, asymptotic flatness, and compatibility with dominant energy conditions. The resulting mass functions yield spacetime geometries free from curvature singularities and exhibit horizons depending on model parameters. To assess the stability of these solutions, we perform a detailed analysis of quasinormal modes (QNMs) under axial gravitational perturbations. We show that the shape of the effective potential, particularly its width and the presence of potential valleys, plays a critical role in determining the QNMs. Models with a large peak-to-valley ratio in the potential barrier tend to support longer-lived oscillations, since perturbations can be partially trapped in the valley region before eventually escaping. By contrast, when the ratio is small, the valley is too shallow to produce effective trapping, and the waveforms reduce to standard exponential decay without sustained oscillatory behavior. Our results highlight the significance of potential design in constructing physically viable and dynamically stable regular black holes, offering potential observational implications in modified gravity and quantum gravity scenarios.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"27 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147736614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

The globally trapped future: a fate for black holes and wormholes 全球被困的未来：黑洞和虫洞的命运

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-21 DOI: 10.1088/1361-6382/ae600d

Yi-Bo Liang and Hong-Rong Li

引用次数: 0

Impact of facility timing and coordination for next-generation gravitational-wave detectors 下一代引力波探测器设备定时和协调的影响

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-20 DOI: 10.1088/1361-6382/ae5b1a

Ssohrab Borhanian, Arianna Renzini, Philippa S Cole, Costantino Pacilio, Michele Mancarella and Davide Gerosa

{"title":"Impact of facility timing and coordination for next-generation gravitational-wave detectors","authors":"Ssohrab Borhanian, Arianna Renzini, Philippa S Cole, Costantino Pacilio, Michele Mancarella and Davide Gerosa","doi":"10.1088/1361-6382/ae5b1a","DOIUrl":"https://doi.org/10.1088/1361-6382/ae5b1a","url":null,"abstract":"While the Einstein telescope and cosmic explorer proposals for next-generation (XG), ground-based detectors promise vastly improved sensitivities to gravitational-wave signals, only joint observations are expected to enable the full scientific potential of these facilities, making timing and coordination between the efforts crucial to avoid missed opportunities. This study investigates the impact of long-term delays on the scientific capabilities of XG detector networks. We use the Fisher information formalism to simulate the performance of a set of detector networks for large, fiducial populations of binary black holes, binary neutron stars, and primordial black-hole binaries. Bootstrapping the simulated populations, we map the expected observation times required to reach a number of observations fulfilling scientific targets for key sensitivity and localization metrics across various network configurations. We also investigate the sensitivity to stochastic backgrounds. We find that purely sensitivity-driven metrics such as the signal-to-noise ratio are not strongly affected by delays between facilities. This is contrasted by the localization metrics, which are very sensitive to the number of detectors in the network and, by extension, to delayed observation campaigns for a detector. Effectively, delays in one detector behave like network-wide interruptions for the localization metrics for networks consisting of two XG facilities. We examine the impact of a supporting, current-generation detector such as LIGO India operating concurrently with XG facilities and find such an addition will greatly mitigate the negative effects of delays for localization metrics, with important consequences on multi-messenger science and stochastic searches.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"78 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147726884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Curvature corrections to the Yukawa potential in Tolman metrics 托尔曼度量中汤川势的曲率修正

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-19 DOI: 10.1088/1361-6382/ae590b

J V Zamperlini and C C Barros Jr

{"title":"Curvature corrections to the Yukawa potential in Tolman metrics","authors":"J V Zamperlini and C C Barros Jr","doi":"10.1088/1361-6382/ae590b","DOIUrl":"https://doi.org/10.1088/1361-6382/ae590b","url":null,"abstract":"This work investigates curvature-induced modifications to the Yukawa potential in static, spherically symmetric spacetimes described by Tolman metrics, focusing on their implications for compact stellar objects, with particular application to solutions IV and VI. Motivated by the interplay of quantum interactions and strong gravitational fields in systems like neutron stars, we derive explicit corrections to the Yukawa potential for these metrics based on recent work. Revisiting the previous result, contrary to what was found, that curvature corrections break the interacting potential radial symmetry near a highly charged black hole, we show that Tolman metric corrections still provide the same symmetry in the local inertial frame. Numerical estimates for astrophysical objects reveal energy shifts of the order of for the solution IV. The Tolman VI solution, while singular at the center, yields comparable corrections for most of the fluid sphere radius. A detailed analysis of the repulsive or attractive feature of the curvature corrections for a local observer is done for each scenario. Despite providing small corrections, these results highlight the role of spacetime geometry in shaping quantum interactions and provide a foundation for future studies of nuclear interactions within the context of relativistic stars.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"243 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147719742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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