General Relativity and Gravitation最新文献_第3页

Observer dependence of quantum effective potential: insights from a Rindler observer 量子有效势的观察者依赖：来自伦德勒观察者的见解

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2025-07-23 DOI: 10.1007/s10714-025-03449-3

Pallab Basu, S. R. Haridev, Prasant Samantray

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Observational restrictions and slow-roll D-brane inflation in the special (F(phi ,T)) gravity 特殊$$F(phi ,T)$$重力下的观测限制和慢滚d膜膨胀

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2025-07-22 DOI: 10.1007/s10714-025-03448-4

Feyzollah Younesizadeh, Davoud Kamani

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Gravitational self-force with hyperboloidal slicing and spectral methods 重力自作用力的双曲面切片和谱方法

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2025-07-19 DOI: 10.1007/s10714-025-03443-9

Benjamin Leather

{"title":"Gravitational self-force with hyperboloidal slicing and spectral methods","authors":"Benjamin Leather","doi":"10.1007/s10714-025-03443-9","DOIUrl":"10.1007/s10714-025-03443-9","url":null,"abstract":"<div>We present a novel approach for calculating the gravitational self-force (GSF) in the Lorenz gauge, employing hyperboloidal slicing and spectral methods. Our method builds on the previous work that applied hyperboloidal surfaces and spectral approaches to a scalar-field toy model [Phys. Rev. D 105, 104033 (2022)], extending them to handle gravitational perturbations. Focusing on first-order metric perturbations, we address the construction of the hyperboloidal foliation, detailing the minimal gauge choice. The Lorenz gauge is adopted to facilitate well-understood regularisation procedures, which are essential for obtaining physically meaningful GSF results. We calculate the Lorenz gauge metric perturbation for a secondary on a quasicircular orbit in a Schwarzschild background via a (known) gauge transformation from the Regge-Wheeler gauge. Our approach yields a robust framework for obtaining the metric perturbation components needed to calculate key physical quantities, such as radiative fluxes, the Detweiler redshift, and self-force corrections. Furthermore, the compactified hyperboloidal approach allows us to efficiently calculate the metric perturbation throughout the entire spacetime. This work thus establishes a foundational methodology for future second-order GSF calculations within this gauge, offering computational efficiencies through spectral methods.</div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 7","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03443-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924597","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}

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Dynamical Wormhole Solutions in f(R, T) Gravity f（R， T）重力下的动态虫洞解

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2025-07-19 DOI: 10.1007/s10714-025-03452-8

Yaghoub Heydarzade, Maryam Ranjbar

{"title":"Dynamical Wormhole Solutions in f(R, T) Gravity","authors":"Yaghoub Heydarzade, Maryam Ranjbar","doi":"10.1007/s10714-025-03452-8","DOIUrl":"10.1007/s10714-025-03452-8","url":null,"abstract":"<div>A class of f(R, T) theories extends the Einstein-Hilbert action by incorporating a general function of R and T, the Ricci scalar and the trace of the ordinary energy-momentum tensor (T_{mu nu }), respectively, thereby introducing a specific modification to the Einstein’s field equations based on matter fields. Given that this modification is intrinsically tied to an energy-momentum tensor (T_{mu nu }) that a priori respects energy conditions, we explore the potential of f(R, T) theories admitting wormhole configurations satisfying energy conditions, unlike General Relativity, which typically necessitates exotic matter sources. Consequently, we investigate the existence of dynamical wormhole geometries that either uphold energy conditions or minimize their violations within the framework of trace of energy-momentum tensor squared gravity. To ensure the generality of our study, we consider two distinct equations of state for the matter content and systematically classify possible solutions based on constraints related to the wormhole’s throat size, the coupling parameter of the theory, and the equation of state parameters.</div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 7","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924598","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

Bound-state solutions for the charged Dirac oscillator in a rotating frame in the Bonnor-Melvin-Lambda spacetime Bonnor-Melvin-Lambda时空中旋转框架中带电狄拉克振子的束缚态解

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2025-07-16 DOI: 10.1007/s10714-025-03447-5

R. R. S. Oliveira

{"title":"Bound-state solutions for the charged Dirac oscillator in a rotating frame in the Bonnor-Melvin-Lambda spacetime","authors":"R. R. S. Oliveira","doi":"10.1007/s10714-025-03447-5","DOIUrl":"10.1007/s10714-025-03447-5","url":null,"abstract":"<div>In this paper, we determine the relativistic bound-state solutions for the charged (DO) Dirac oscillator in a rotating frame in the Bonnor-Melvin-Lambda spacetime in ((2+1))-dimensions, where such solutions are given by the two-component normalizable Dirac spinor and by the relativistic energy spectrum. To analytically solve our problem, we consider two approximations, where the first is that the cosmological constant is very small (conical approximation), and the second is that the linear velocity of the rotating frame is much less than the speed of light (slow rotation regime). After solving a second-order differential equation, we obtain a generalized Laguerre equation, whose solutions are the generalized Laguerre polynomials. Consequently, we obtain the energy spectrum, which is quantized in terms of the radial and total magnetic quantum numbers n and (m_j), and depends on the angular frequency (omega ) (describes the DO), cyclotron frequency (omega _c) (describes the external magnetic field), angular velocity (Omega ) (describes the rotating frame), spin parameter s (describes the “spin”), spinorial parameter u (describes the components of the spinor), effective rest mass (m_{eff}) (describes the rest mass modified by the spin-rotation coupling), and on a real parameter (sigma ) and cosmological constant (Lambda ) (describes the Bonnor-Melvin-Lambda spacetime). In particular, we note that this spectrum is asymmetrical (due to (Omega )) and has its degeneracy broken (due to (sigma ) and (Lambda )). Besides, we also graphically analyze the behavior of the spectrum and of the probability density as a function of the parameters of the system for different values of n and (m_j).</div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 7","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924599","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

Quasi-normal mode expansions of black hole perturbations: a hyperboloidal Keldysh’s approach 黑洞扰动的准正模展开：双曲Keldysh方法

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2025-07-14 DOI: 10.1007/s10714-025-03438-6

Jérémy Besson, José Luis Jaramillo

{"title":"Quasi-normal mode expansions of black hole perturbations: a hyperboloidal Keldysh’s approach","authors":"Jérémy Besson, José Luis Jaramillo","doi":"10.1007/s10714-025-03438-6","DOIUrl":"10.1007/s10714-025-03438-6","url":null,"abstract":"<div>We study quasinormal mode expansions by adopting a Keldysh scheme for the spectral construction of asymptotic resonant expansions. Quasinormal modes are first cast in terms of a non-selfadjoint problem by adopting, in a black hole perturbation setting, a spacetime hyperboloidal approach. Then the Keldysh expansion of the resolvent, built on bi-orthogonal systems, provides a spectral version of Lax-Phillips expansions on scattering resonances. We clarify the role of scalar product structures in the Keldysh setting [1], that prove non-necessary to construct the resonant expansions (in particular the quasinormal mode time-series at null infinity), but are required to define the (constant) excitation coefficients in the bulk resonant expansion. We demonstrate the efficiency and accuracy of the Keldysh spectral approach to (non-selfadjoint) dynamics, even beyond its limits of validity, in particular recovering Schwarzschild black hole late power-law tails. We also study early dynamics by exploring i) the existence of an earliest time of validity of the resonant expansion and ii) the interplay between overtones extracted with the Keldysh scheme and regularity. Specifically, we address convergence aspects of the series and, on the other hand, we implement non-modal analysis tools, namely assessing (H^p)-Sobolev dynamical transient growths and constructing (H^p)-pseudospectra. Finally, we apply the Keldysh scheme to calculate “second-order” quasinormal modes and complement the qualitative study of overtone distribution by presenting the Weyl law for the counting of quasinormal modes in black holes with different (flat, De Sitter, anti-De Sitter) spacetime asymptotics.</div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 7","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03438-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924600","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

Publisher Correction: Cosmic inflation from entangled qubits: a white hole model for emergent spacetime 来自纠缠量子比特的宇宙膨胀：新兴时空的白洞模型

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2025-07-09 DOI: 10.1007/s10714-025-03434-w

Roger Eugene Hill

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Topical Collection – Black Holes Inside and Out 2024: Visions for the future of black hole physics 专题合集-黑洞内外2024：对黑洞物理学未来的展望

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2025-07-09 DOI: 10.1007/s10714-025-03444-8

Luca Buoninfante, Raúl Carballo-Rubio, Vitor Cardoso, Francesco Di Filippo, Astrid Eichhorn

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Correction to: geometrical origin of the cosmological constant, Gen. Relativ. Gravit. 44, 2547-2561 (2012) 修正：宇宙常数的几何起源，相对论。重力，44,2547-2561 （2012）

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2025-07-08 DOI: 10.1007/s10714-025-03445-7

Meriem Hameurlaine, Hemza Azri, Abdelhafid Bounames

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Preparation of a Cross-linked CTS Composite Ion Sieve and a Study of Lithium Adsorption from Oilfield Brines 交联CTS复合离子筛的制备及对油田卤水中锂的吸附研究

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2025-07-07 DOI: 10.1007/s10230-025-01065-w

Yuyu Gao, Bingbing Chen, Zhili Zhang

{"title":"Preparation of a Cross-linked CTS Composite Ion Sieve and a Study of Lithium Adsorption from Oilfield Brines","authors":"Yuyu Gao, Bingbing Chen, Zhili Zhang","doi":"10.1007/s10230-025-01065-w","DOIUrl":"https://doi.org/10.1007/s10230-025-01065-w","url":null,"abstract":"The development of new technologies for extracting lithium from alternative sources, such as liquid brines, has become increasingly important. Among these technologies, lithium ion sieve adsorbents have garnered widespread attention due to their advantages, including simplicity of operation, low environmental impact, and recyclability. In this study, a crosslinked chitosan/H1.6Mn1.6O4 (CTS/HMO) adsorbent with excellent adsorption performance for Li+ in oilfield brine was prepared by coating crosslinked CTS onto lithium manganese oxides. The optimal conditions for Li+ adsorption from brine using the crosslinked CTS/HMO adsorbent were found to be a temperature of 30 °C and a pH of 12, with a maximum adsorption capacity of 31.7 mg/g. After five adsorption–desorption cycles, the adsorbent's capacity decreased by only 3.15%, retaining an adsorption capacity of 30.7 mg/g, demonstrating its strong cyclic stability. This study offers a novel approach for the efficient recovery of lithium resources from oilfield brines.<h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"15 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144928674","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