发布求助
文献互助 智能选刊 最新文献

General Relativity and Gravitation最新文献

筛选
英文 中文
The stability problem for extremal black holes 极端黑洞的稳定性问题
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-03-18 DOI: 10.1007/s10714-025-03394-1
Mihalis Dafermos
{"title":"The stability problem for extremal black holes","authors":"Mihalis Dafermos","doi":"10.1007/s10714-025-03394-1","DOIUrl":"10.1007/s10714-025-03394-1","url":null,"abstract":"<div><p>I present a series of conjectures aiming to describe the general dynamics of the Einstein equations of classical general relativity in the vicinity of extremal black holes. I will reflect upon how these conjectures transcend older paradigms concerning extremality and near-extremality, in particular, the so-called “third law of black hole thermodynamics”, which viewed extremality as an unattainable limit, and the “overspinning/overcharging” scenarios, which viewed extremality as a harbinger of naked singularities. Finally, I will outline some of the difficulties in proving these conjectures and speculate on what it could mean if the conjectures turn out not to be true.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03394-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645488","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
Some thoughts about black holes in asymptotic safety 关于黑洞渐近安全的一些思考
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-03-15 DOI: 10.1007/s10714-025-03390-5
Alessia Platania
{"title":"Some thoughts about black holes in asymptotic safety","authors":"Alessia Platania","doi":"10.1007/s10714-025-03390-5","DOIUrl":"10.1007/s10714-025-03390-5","url":null,"abstract":"<div><p>We discuss the current status of black holes within quantum gravity approaches based on quantum field theory, and particularly asymptotic safety. We highlight key open questions in the field, including the difficulty of deriving global solutions from the effective action, the role of matter in constraining the set of all possible alternatives to classical black holes, the importance of the formation probability, and its implications for both conceptual and practical aspects. These challenges highlight some necessary developments in the field and single out a few future directions, which could be promising to progress our understanding of black holes in quantum gravity.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622000","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
On black holes in teleparallel torsion theories of gravity 关于遥平行引力扭转理论中的黑洞
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-03-15 DOI: 10.1007/s10714-025-03387-0
A. A. Coley, N. T. Layden, D. F. López
{"title":"On black holes in teleparallel torsion theories of gravity","authors":"A. A. Coley,&nbsp;N. T. Layden,&nbsp;D. F. López","doi":"10.1007/s10714-025-03387-0","DOIUrl":"10.1007/s10714-025-03387-0","url":null,"abstract":"<div><p>We first present an overview of the Schwarzschild vacuum spacetime within general relativity, with particular emphasis on the role of scalar polynomial invariants and the null frame approach (and the related Cartan invariants), that justifies the conventional interpretation of the Schwarzschild geometry as a black hole spacetime admitting a horizon (at <span>(r=2M)</span> in Schwarzschild coordinates) shielding a singular point at the origin. We then consider static spherical symmetric vacuum teleparallel spacetimes in which the torsion characterizes the geometry, and the scalar invariants of interest are those constructed from the torsion and its (covariant) derivatives. We investigate the Schwarzschild-like spacetime in the teleparallel equivalent of general relativity and find that the torsion scalar invariants (and, in particular, the scalar <i>T</i>) diverge at the putative “Schwarzschild” horizon. In this sense the resulting spacetime is <i>not</i> a black hole spacetime. We then briefly consider the Kerr-like solution in the teleparallel equivalent of general relativity and obtain a similar result. Finally, we investigate static spherically symmetric vacuum spacetimes within the more general <i>F</i>(<i>T</i>) teleparallel gravity and show that if a such a geometry admits a horizon, then the torsion scalar <i>T</i> necessarily diverges there; consequently in this sense such a geometry also does <i>not</i> represent a black hole.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627741","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
Gravitational collapse of Bose–Einstein condensate dark matter in generalized Vaidya spacetime 广义Vaidya时空中玻色-爱因斯坦凝聚暗物质的引力坍缩
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-03-14 DOI: 10.1007/s10714-025-03392-3
Prabir Rudra
{"title":"Gravitational collapse of Bose–Einstein condensate dark matter in generalized Vaidya spacetime","authors":"Prabir Rudra","doi":"10.1007/s10714-025-03392-3","DOIUrl":"10.1007/s10714-025-03392-3","url":null,"abstract":"<div><p>In this work we study the gravitational collapse procedure in generalized Vaidya spacetime with Bose–Einstein condensate dark matter density profile. We use the generalized Vaidya metric to simulate the spacetime of a big star and subsequently obtain the field equations. Then we proceed to determine the star system’s mass parameter by solving the field equations. Then the gravitational collapse mechanism is investigated using the derived solutions. Investigating the nature of the singularity (if formed) as the end state of the collapse is the main goal. Dark matter in the form of Bose–Einstein condensate is expected to play a crucial role in the fate of the collapse. We see that there is a possibility of the formation of both black holes and naked singularities as the end state of the collapse depending upon the initial conditions. The junction conditions are derived with a Vaidya exterior and a Friedmann interior and some important insights are obtained. A Penrose diagram showing the causal relations between the spacetimes is generated and studied in detail.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621989","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
Energy estimates for the good-bad-ugly model 好-坏-丑模型的能源估计
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-03-10 DOI: 10.1007/s10714-025-03389-y
Miguel Duarte
{"title":"Energy estimates for the good-bad-ugly model","authors":"Miguel Duarte","doi":"10.1007/s10714-025-03389-y","DOIUrl":"10.1007/s10714-025-03389-y","url":null,"abstract":"<div><p>We establish a relationship between the equations that constitute the so-called <i>good-bad-ugly model</i>, whose nonlinearities are known to mimic those present in the Einstein field equations in generalized harmonic gauge. This relationship between ugly fields and good and bad ones stems from the fact that one can write the equation for the rescaled derivative of an ugly along an incoming null direction as a good or a bad equation depending on whether there are source terms or not. This provides a new interpretation of the logarithms of the radial coordinate that show up in expansions of solutions to ugly equations near null infinity. This furthermore allows us to use the Klainerman-Sobolev inequality for the standard wave equation on Cauchy slices to show uniform boundedness for the ugly equation. In the second part of this paper we perform a first order reduction of the ugly equation with given sources in flat space and we radially compactify the coordinates in order to show an energy estimate for that equation on hyperboloidal slices. This result is an important first step towards establishing energy estimates for the hyperboloidal initial value problem of the first order compactified Einstein field equations in generalized harmonic gauge.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143583462","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
Classical general relativity effects by magnetars with massive quadrupole, angular momentum and a magnetic dipole 具有大质量四极、角动量和磁偶极的磁星对经典广义相对论的影响
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-03-10 DOI: 10.1007/s10714-025-03388-z
Alexander Mora-Chaverri, Edwin Santiago-Leandro, Francisco Frutos-Alfaro
{"title":"Classical general relativity effects by magnetars with massive quadrupole, angular momentum and a magnetic dipole","authors":"Alexander Mora-Chaverri,&nbsp;Edwin Santiago-Leandro,&nbsp;Francisco Frutos-Alfaro","doi":"10.1007/s10714-025-03388-z","DOIUrl":"10.1007/s10714-025-03388-z","url":null,"abstract":"<div><p>In this contribution, we obtain classical tests of general relativity using the Hartle-Thorne metric endowed with magnetic dipole and electric charge. This metric represents the approximate stationary spacetime of a massive object with the other characteristics mentioned. These tests are light deflection, time delay, periastron precession, and gravitational redshift. We also provide numerical estimates for real magnetars and magnetar candidates from the McGill magnetar catalog, the millisecond pulsar PSR B1257+12 and for the Sun in low-activity cycles. Our results find that, although the magnetic dipole moment contribution tends to be negligible compared to the total amount, its comparison to the massive quadrupole moment and rotational contributions varies from one classical test to the next. For light deflection, the magnetic dipole contribution is about 2 orders of magnitude smaller, compared to the rotational contribution. The magnetic dipole moment contribution is present, but is about 6 orders of magnitude smaller than the second-order rotational contribution to the periastron precession, 5 orders of magnitude smaller for the time delay, and negligible within the approximation presented for the gravitational redshift. The magnetic dipole contribution for the calculations made with PSR B1257+12 was also negligible, but the rotational and quadrupole moment contributions were more significant, which makes the argument for possible future detection stronger than the magnetar case. The rotation, massive quadrupole moment and magnetic dipole contributions for the Sun turned out to be negligible as well.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143583461","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
The non-linear regime of gravity 重力的非线性状态
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-03-05 DOI: 10.1007/s10714-025-03377-2
Luis Lehner
{"title":"The non-linear regime of gravity","authors":"Luis Lehner","doi":"10.1007/s10714-025-03377-2","DOIUrl":"10.1007/s10714-025-03377-2","url":null,"abstract":"<div><p>In the second century of General Relativity, building upon the exquisite foundation that analytical and perturbative studies have provided, the detailed understanding of the non-linear regime of gravity will increasingly take a prominent role. Fueled in part by computational advances as well as observational challenges, and drawing inspiration and tools from other areas in physics, new insights will be unraveled and likely exciting surprises.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546447","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
Constraining extended Proca-Nuevo theory through big bang nucleosynthesis 通过大爆炸核合成约束扩展原新理论
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-02-28 DOI: 10.1007/s10714-025-03386-1
N. S. Kavya, L. Sudharani, V. Venkatesha
{"title":"Constraining extended Proca-Nuevo theory through big bang nucleosynthesis","authors":"N. S. Kavya,&nbsp;L. Sudharani,&nbsp;V. Venkatesha","doi":"10.1007/s10714-025-03386-1","DOIUrl":"10.1007/s10714-025-03386-1","url":null,"abstract":"<div><p>This study explores a covariant extension of the Proca framework, incorporating nonlinear terms for a massive spin-1 field while ensuring consistency and ghost-free behavior. Coupled with gravity, this effective extended Proca-Nuevo model provides viable cosmological solutions, constrained by Big Bang Nucleosynthesis observations. By enforcing <span>( |Delta T_f / T_f| &lt; 4.7 times 10^{-4} )</span>, the model parameter <span>(Lambda )</span> is restricted to the range <span>( Lambda in left( -2.80025 times 10^{-4}, , 2.80025 times 10^{-4}right) )</span>. This correction supports a consistent description of the Big Bang Nucleosynthesis era, effectively aligning the freeze-out temperature predictions with observational bounds and the constrained Hubble function predicting accelerated expansion across all redshifts. These findings highlight the potential of extended Proca-Nuevo theories in bridging modified gravity and Effective Field Theory, providing the aspects of early-time cosmology.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143517944","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
Quantum two-level systems and gravitational waves 量子二能级系统和引力波
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-02-24 DOI: 10.1007/s10714-025-03385-2
Matteo Luca Ruggiero
{"title":"Quantum two-level systems and gravitational waves","authors":"Matteo Luca Ruggiero","doi":"10.1007/s10714-025-03385-2","DOIUrl":"10.1007/s10714-025-03385-2","url":null,"abstract":"<div><p>We study the interaction between gravitational waves and a quantum two-level system consisting of a spin 1/2 particle using the formalism of the proper detector frame. This approach highlights the effects of gravitational waves on both the particles and the observer, emphasizing that only relative measurements can be made. Specifically, within this framework, the gravitational field of the waves is described using the gravitoelectromagnetic analogy. The interaction of the system is then determined by the gravitomagnetic field of the wave, which induces a time-dependent perturbation. We analyze this perturbation for both generic frequencies and resonance conditions, and discuss its implications.\u0000\u0000\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143475292","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
Mukkamala-Pereñiguez master function for even-parity perturbations of the Schwarzschild spacetime Mukkamala-Pereñiguez史瓦西时空偶宇称微扰的主函数
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-02-21 DOI: 10.1007/s10714-025-03384-3
Eric Poisson
{"title":"Mukkamala-Pereñiguez master function for even-parity perturbations of the Schwarzschild spacetime","authors":"Eric Poisson","doi":"10.1007/s10714-025-03384-3","DOIUrl":"10.1007/s10714-025-03384-3","url":null,"abstract":"<div><p>Mukkamala and Pereñiguez recently discovered a new master function for even-parity metric perturbations of the Schwarzschild spacetime. Remarkably, this function satisfies the Regge–Wheeler equation (instead of the Zerilli equation), which was previously understood to govern the odd-parity sector of the perturbation only. In this paper I follow up on their work. First, I identify a source term for their Regge–Wheeler equation, constructed from the perturbing energy-momentum tensor. Second, I relate the new master function to the radiation fields at future null infinity and the event horizon. Third, I reconstruct the metric perturbation from the new master function, in the Regge–Wheeler gauge. The main conclusion of this work is that the greater simplicity of the Regge–Wheeler equation (relative to the Zerilli equation) is offset by a greater complexity of obtaining the radiation fields and reconstructing the metric.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465950","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信