General Relativity and Gravitation最新文献_第9页

Canonial analysis of general relativity formulated with the new metric (f^{ab}=(-g)^{alpha }g^{ab}) 用新度量$$f^{ab}=(-g)^{alpha }g^{ab}$$ 对广义相对论的 Canonial 分析

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-06-08 DOI: 10.1007/s10714-024-03258-0

J. Klusoň

引用次数: 0

Optimization of entanglement depends on whether a black hole is extremal 纠缠的优化取决于黑洞是否极值

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-06-04 DOI: 10.1007/s10714-024-03259-z

Subhajit Barman, Bibhas Ranjan Majhi

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引用次数: 0

Free scalar field theory on a Sobolev space over a bounded interval 有界区间索波列夫空间上的自由标量场论

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-05-30 DOI: 10.1007/s10714-024-03256-2

J. Fernando Barbero G.

引用次数: 0

Interior spacetimes sourced by stationary differentially rotating irrotational cylindrical fluids: anisotropic pressure 由静止的差向旋转非旋转圆柱流体产生的内部时空：各向异性压力

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-05-27 DOI: 10.1007/s10714-024-03254-4

Marie-Noëlle Célérier

引用次数: 0

Adiabatic theory in Kerr spacetimes 克尔时空中的绝热理论

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-05-26 DOI: 10.1007/s10714-024-03255-3

Kuantay Boshkayev, Gulmira Nurbakyt, Hernando Quevedo, Gulnara Suliyeva, Abylaykhan Tlemissov, Zhanerke Tlemissova, Anar Dalelkhankyzy, Aliya Taukenova, Ainur Urazalina, Zdenek Stuchlík, Nurzada Beissen, Sholpan Gumarova

引用次数: 0

The Euclidean-hyperboloidal foliation method: application to f(R) modified gravity 欧几里得-双曲面对折法：应用于 f(R) 修正重力

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-05-25 DOI: 10.1007/s10714-024-03250-8

Philippe G. LeFloch, Yue Ma

{"title":"The Euclidean-hyperboloidal foliation method: application to f(R) modified gravity","authors":"Philippe G. LeFloch, Yue Ma","doi":"10.1007/s10714-024-03250-8","DOIUrl":"10.1007/s10714-024-03250-8","url":null,"abstract":"<div>This paper is a part of a series devoted to the Euclidean-hyperboloidal foliation method introduced by the authors for investigating the global existence problem associated with nonlinear systems of coupled wave-Klein–Gordon equations with small data. This method was developed especially for investigating the initial value problem for the Einstein-massive field system in wave gauge. Here, we study the (fourth-order) field equations of f(R) modified gravity and investigate the global dynamical behavior of the gravitational field in the near-Minkowski regime. We establish the existence of a globally hyperbolic Cauchy development approaching Minkowski spacetime (in spacelike, null, and timelike directions), when the initial data set is sufficiently close to an asymptotically Euclidean and spacelike hypersurface in Minkowski spacetime. We cast the (fourth-order) f(R)-field equations in the form of a second-order wave-Klein–Gordon system, which has an analogous structure to the Einstein-massive field system but, in addition, involves a (possibly small) effective mass parameter. We establish the nonlinear stability of the Minkowski spacetime in the context of f(R) gravity, when the integrand f(R) in the action functional can be taken to be arbitrarily close to the integrand R of the standard Hilbert–Einstein action.</div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141096753","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

Hamiltonian analysis and Faddeev–Jackiw formalism for two dimensional quadratic gravity expressed as BF theory 以 BF 理论表达的二维二次引力的哈密顿分析和法德耶夫-杰克夫形式主义

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-05-24 DOI: 10.1007/s10714-024-03249-1

Jaime Manuel Cabrera, Jorge Mauricio Paulin Fuentes

引用次数: 0

Modified FRW cosmology with massive gravity in the spectrum of the rainbow 修正的 FRW 宇宙学与彩虹光谱中的大质量引力

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-05-23 DOI: 10.1007/s10714-024-03252-6

Muhammad Naeem, Aysha Bibi

{"title":"Modified FRW cosmology with massive gravity in the spectrum of the rainbow","authors":"Muhammad Naeem, Aysha Bibi","doi":"10.1007/s10714-024-03252-6","DOIUrl":"10.1007/s10714-024-03252-6","url":null,"abstract":"<div>In this study, authors investigate a novel framework incorporating exponential electrodynamics and d-dimensional energy-dependent massive gravity. Our focus lies in demonstrating that a nonlinear electromagnetic field, acting as the gravitational source, leads to an accelerated expansion of the universe. Employing massive gravity’s rainbow as a catalyst for cosmic evolution, the big bang singularity inherent in the model is successfully eliminated. This analysis reveals that the synergy between the magnetic universe and massive gravity’s rainbow is the underlying cause of the observed accelerated cosmic expansion. The classical stability during the deceleration phase and ensure the causality of the model are established. Additionally, we delve into 4-dimensional energy-dependent cosmology. Furthermore, approximations for key cosmological parameters such as the running of the spectral index, tensor-to-scalar ratio, and, the spectral index are presented. These estimations closely align with observational data from PLANCK and WMAP, providing valuable insights into the compatibility of the proposed model with empirical evidence.\u0000</div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141085308","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

Extended Bose–Einstein condensate dark matter in f(Q) gravity f(Q) 引力下的扩展玻色-爱因斯坦凝聚暗物质

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-05-22 DOI: 10.1007/s10714-024-03247-3

Aaqid Bhat, Raja Solanki, P. K. Sahoo

{"title":"Extended Bose–Einstein condensate dark matter in f(Q) gravity","authors":"Aaqid Bhat, Raja Solanki, P. K. Sahoo","doi":"10.1007/s10714-024-03247-3","DOIUrl":"10.1007/s10714-024-03247-3","url":null,"abstract":"<div>In this article, we attempt to explore the dark sector of the universe i.e. dark matter and dark energy, where the dark energy components are related to the modified f(Q) Lagrangian, particularly a power law function (f(Q)= gamma left( frac{Q}{Q_0}right) ^n), while the dark matter component is described by the Extended Bose–Einstein Condensate (EBEC) equation of state for dark matter, specifically, (p = alpha rho + beta rho ^2). We find the corresponding Friedmann-like equations and the continuity equation for both dark components along with an interacting term, specifically (mathcal {Q} = 3b^2H rho ), which signifies the energy exchange between the dark sector of the universe. Further, we derive the analytical expression of the Hubble function, and then we find the best-fit values of free parameters utilizing the Bayesian analysis to estimate the posterior probability and the Markov Chain Monte Carlo (MCMC) sampling technique corresponding to CC+Pantheon+SH0ES samples. In addition, to examine the robustness of our MCMC analysis, we perform a statistical assessment using the Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC). Further from the evolutionary profile of the deceleration parameter and the energy density, we obtain a transition from the decelerated epoch to the accelerated expansion phase, with the present deceleration parameter value as (q(z=0)=q_0=-0.56^{+0.04}_{-0.03}) ((68 %) confidence limit), that is quite consistent with cosmological observations. In addition, we find the expected positive behavior of the effective energy density. Finally, by examining the sound speed parameter, we find that the assumed theoretical f(Q) model is thermodynamically stable.</div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141079192","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

A generalization of the Hawking black hole area theorem 霍金黑洞面积定理的一般化

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-05-21 DOI: 10.1007/s10714-024-03245-5

Eleni-Alexandra Kontou, Veronica Sacchi

引用次数: 0