General Relativity and Gravitation最新文献_第7页

Scalaron hair induced by topological vortices in quadratic f(R) gravity on a BTZ black hole background BTZ黑洞背景下二次f(R)重力下拓扑涡诱导的标量毛发

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2026-06-03 DOI: 10.1007/s10714-026-03567-6

C. A. S. Almeida, F. C. E. Lima

{"title":"Scalaron hair induced by topological vortices in quadratic f(R) gravity on a BTZ black hole background","authors":"C. A. S. Almeida, F. C. E. Lima","doi":"10.1007/s10714-026-03567-6","DOIUrl":"10.1007/s10714-026-03567-6","url":null,"abstract":"<div><p>We investigate the excitation of the propagating scalar degree of freedom—the scalaron—in quadratic <i>f</i>(<i>R</i>) gravity by localized Maxwell-Higgs vortices in a <span>((2+1))</span>-dimensional BTZ black hole spacetime. In the perturbative regime where the higher-curvature coupling is small compared to the AdS scale, the modified trace equation reduces to a massive Klein-Gordon equation for the Ricci scalar, sourced by the vortex energy-momentum tensor. Using the Sturm-Liouville structure of the radial operator, we construct the exact radial Green function and obtain the curvature profile for an arbitrary localized source. Outside the vortex core, the induced curvature perturbation exhibits a universal power-law decay <span>(R(r) sim r^{-(1+nu )})</span>, independent of the microscopic vortex structure, where the exponent <span>(nu )</span> coincides with the standard AdS mass-dimension relation. We demonstrate that the scalar excitation is linearly stable, satisfies the Breitenlohner-Freedman bound, carries finite total energy, and produces exponentially suppressed backreaction on the BTZ geometry, ensuring the smooth recovery of the Einstein limit. These results provide an analytically tractable realization of how higher-curvature corrections activate local gravitational dynamics in three dimensions.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"58 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-026-03567-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172635","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

The failure of the Ehlers–Kundt conjecture in the impulsive case 埃尔斯-昆特猜想在脉冲情况下的失败

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2026-06-03 DOI: 10.1007/s10714-026-03565-8

Moriz L. Frauenberger, James D. E. Grant, Roland Steinbauer

引用次数: 0

Cosmological perturbations in energy-momentum squared gravity 能量动量平方重力的宇宙学扰动

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2026-06-03 DOI: 10.1007/s10714-026-03568-5

Peter K. S. Dunsby, Maria-Alexia Caldis, Eduardo Bittencourt

{"title":"Cosmological perturbations in energy-momentum squared gravity","authors":"Peter K. S. Dunsby, Maria-Alexia Caldis, Eduardo Bittencourt","doi":"10.1007/s10714-026-03568-5","DOIUrl":"10.1007/s10714-026-03568-5","url":null,"abstract":"<div><p>We present a fully covariant and gauge–invariant analysis of linear cosmological perturbations in Energy-Momentum Squared Gravity. Working within the <span>(1!+!3)</span> formalism, we derive the exact propagation equations for scalar, vector, and tensor modes on FLRW backgrounds, in the case of radiation and dust. Two representative subclasses are examined in detail, in which non-linearity enters through <span>(mathcal {O}(eta rho ^2))</span> corrections or modifications in the equation-of-state parameter and the sound speed. For scalar perturbations, the density contrast can be enhanced or reduced relative to General Relativity, depending on the coupling parameter and the wavelength regime. A similar behavior occurs for vector modes, allowing for a non-trivial vorticity at early times. Tensor modes, described by the magnetic part of the Weyl tensor and the shear tensor propagate as damped waves with slowly varying effective masses. All sectors reduce continuously to their GR limits as <span>(eta !rightarrow !0)</span>. The framework isolates robust signatures—early-time scalar tilts, tensor damping shifts, and altered vorticity decay—that can be confronted with CMB and large-scale-structure observations to constrain these theories of gravity.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"58 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-026-03568-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172520","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

Hybrid generalized uncertainty relations from entanglement and minimal length 最小长度和纠缠的混合广义不确定性关系

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2026-05-31 DOI: 10.1007/s10714-026-03566-7

S. Hamid Mehdipour

{"title":"Hybrid generalized uncertainty relations from entanglement and minimal length","authors":"S. Hamid Mehdipour","doi":"10.1007/s10714-026-03566-7","DOIUrl":"10.1007/s10714-026-03566-7","url":null,"abstract":"<div><p>We develop a unified framework for hybrid generalized uncertainty relations (HGURs) that incorporates two fundamental and competing mechanisms: Planck-scale minimal-length effects encoded by the generalized uncertainty principle (GUP), and the suppression of quantum fluctuations induced by multipartite entanglement as described by generalized uncertainty relations (GURs). Focusing on ensembles of identical pure entangled (IPE) systems, we derive an exact variance-based HGUR valid for an arbitrary number of constituents. The resulting relation reveals a nontrivial interplay between gravity-induced amplification of uncertainty and entanglement-driven redistribution of quantum correlations, leading to an effective reduction of local uncertainties with increasing system size. In the symmetric limit, we identify a critical saturation regime in which the entanglement-induced suppression is exactly balanced by minimal-length corrections, establishing a fundamental bound on the reduction of quantum fluctuations in highly correlated quantum systems. We analyze the limiting behavior of the HGUR and discuss its conceptual implications for the emergence of classical spacetime, as well as potential applications to black hole thermodynamics, inflationary cosmology, and vacuum energy. Our results provide an information-theoretic bridge between quantum gravity effects and the suppression of quantum fluctuations at macroscopic scales.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"58 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148061241","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

Electromagnetic emission from a black-to-white hole transition - Photospheric emission 从黑洞到白洞跃迁的电磁发射。光球发射

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2026-05-25 DOI: 10.1007/s10714-026-03564-9

Mattia Villani

引用次数: 0

Existence of uniform Temple charts and applications to null distance 统一坦普尔图的存在及其在零距离上的应用

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2026-05-24 DOI: 10.1007/s10714-026-03563-w

B Meco, A Sakovich, C Sormani

引用次数: 0

Dynamical Evolutions of Electrically Charged Proca Stars 带电原甲星的动力学演化

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2026-05-21 DOI: 10.1007/s10714-026-03560-z

Yahir Mio, Miguel Alcubierre

{"title":"Dynamical Evolutions of Electrically Charged Proca Stars","authors":"Yahir Mio, Miguel Alcubierre","doi":"10.1007/s10714-026-03560-z","DOIUrl":"10.1007/s10714-026-03560-z","url":null,"abstract":"<div><p>In a previous work we constructed different families of stationary electrically charged Proca stars characterized by a charge parameter <i>q</i>, by solving the Einstein–Maxwell–Proca system in spherical symmetry, and imposing a harmonic time dependence ansatz for the Proca field [1]. We showed that there is a critical value for the charge <span>(q_c)</span> that corresponds to the value for which the Coulomb repulsion of the charged Proca field exactly cancels the Newtonian gravitational attraction, and we found that supercritical solutions can only exist for a limited range of charges above this critical value <span>(q>q_c)</span>. Here we study the dynamical stability properties of these charged Proca stars by adding a small but finite perturbation to the original stationary configurations, and then performing numerical evolutions while keeping the spherical symmetry. We show that, for any given family, the parameter space can be separated into three regions corresponding to gravitationally bound stable configurations, gravitationally bound unstable configurations, and gravitationally unbound unstable configurations. For the unstable configurations we follow the evolution in time in order to determine their final state, and find that this final state can be collapse to a charged Reissner–Nordström black hole, migration to a new state in the stable branch, or dispersion to infinity, depending on the value of the binding energy and the specific form of the perturbation.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"58 5","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-026-03560-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009461","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

Cosmological evolution of a nonminimally coupled scalar field with hilltop potential 具有山顶势的非最小耦合标量场的宇宙学演化

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2026-05-21 DOI: 10.1007/s10714-026-03549-8

Yerlan Myrzakulov

引用次数: 0

Holographic Pressure and Extensivity of Rotating Black Holes at Finite Cutoff 在有限截止点旋转黑洞的全息压力和广泛性

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2026-05-21 DOI: 10.1007/s10714-026-03561-y

Hoang Van Quyet

引用次数: 0

Hamiltonian formalism, master functions and Darboux transformations for perturbed (Interiors and Exteriors of) nonrotating black holes 哈密顿形式主义，主函数和摄动（内部和外部）非旋转黑洞的达布变换

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2026-05-18 DOI: 10.1007/s10714-026-03559-6

Michele Lenzi, Guillermo A. Mena Marugán, Andrés Mínguez-Sánchez, Carlos F. Sopuerta

{"title":"Hamiltonian formalism, master functions and Darboux transformations for perturbed (Interiors and Exteriors of) nonrotating black holes","authors":"Michele Lenzi, Guillermo A. Mena Marugán, Andrés Mínguez-Sánchez, Carlos F. Sopuerta","doi":"10.1007/s10714-026-03559-6","DOIUrl":"10.1007/s10714-026-03559-6","url":null,"abstract":"<div><p>Motivated by their relevance to the interior of nonrotating black holes, classical and quantum Kantowski-Sachs cosmologies have recently attracted increasing attention. This interest has led to the development of a Hamiltonian formalism for axial and polar perturbations, which can be extended to applications in the exterior region. The formalism provides also a description of the background physical degrees of freedom. Moreover, it allows for the construction of all physical perturbative gauge invariants, which can be arranged into canonical pairs associated with master functions. In this work, we review the basis of this Hamiltonian formalism, putting the emphasis on its foundations and fundamental steps rather than on details of the involved calculations. Our discussion focuses on classical and effective aspects, although we also briefly comment on its natural role in the quantization of perturbed black holes. Adopting this formalism we present a geometric interpretation of Darboux transformations between pairs of master functions, characterizing them as generalized canonical transformations that preserve the Hamiltonian structure of the perturbations as harmonic oscillators subject to certain potentials. This bijective correspondence between such canonical transformations and Darboux transformations, which was recently proved to hold for axial perturbations, is here extended to the case of polar perturbations. In addition, we demonstrate the existence of canonical transformations that, similarly to Darboux transformations, mix axial and polar master functions.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"58 5","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148008761","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