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
Quantum theory of the Lemaître model for gravitational collapse 引力坍缩的lema<e:1>模型的量子理论
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-28 DOI: 10.1007/s10714-025-03349-6
Claus Kiefer, Hamid Mohaddes
{"title":"Quantum theory of the Lemaître model for gravitational collapse","authors":"Claus Kiefer,&nbsp;Hamid Mohaddes","doi":"10.1007/s10714-025-03349-6","DOIUrl":"10.1007/s10714-025-03349-6","url":null,"abstract":"<div><p>We investigate the quantum fate of the classical singularities that occur by gravitational collapse of a dust cloud. For this purpose, we address the quantization of a model first proposed by Georges Lemaître in 1933. We find that the singularities can generically be avoided. This is a consequence of unitary evolution in the quantum theory, whereby the quantum dust cloud collapses, bounces at a minimal radius and re-expands.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03349-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050012","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
Quantum black holes: from regularization to information paradoxes 量子黑洞：从正则化到信息悖论
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-24 DOI: 10.1007/s10714-025-03356-7
Niayesh Afshordi, Stefano Liberati
{"title":"Quantum black holes: from regularization to information paradoxes","authors":"Niayesh Afshordi,&nbsp;Stefano Liberati","doi":"10.1007/s10714-025-03356-7","DOIUrl":"10.1007/s10714-025-03356-7","url":null,"abstract":"<div><p>Quantum black holes, a broad class of objects that refine the solutions of general relativity by incorporating semiclassical and/or quantum gravitational effects, have recently attracted renewed attention within the scientific community. This resurgence of interest is largely driven by advances in gravitational wave astronomy, which have opened the possibility of testing some of these models in the near future. In this essay, we provide a concise overview of the key discussions that emerged during the “Black Hole Inside/Out\" meeting, held in August 2024 in Copenhagen. We report these ideas, their connections to the information paradox, and the potential use of analogue gravity as a test bed for these concepts.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026537","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
Non-commutative classical and quantum fractionary cosmology: anisotropic Bianchi type I case 非交换经典和量子分数宇宙学：各向异性Bianchi I型情况
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-24 DOI: 10.1007/s10714-025-03363-8
J. Socorro, J. Juan Rosales, Leonel Toledo Sesma
{"title":"Non-commutative classical and quantum fractionary cosmology: anisotropic Bianchi type I case","authors":"J. Socorro,&nbsp;J. Juan Rosales,&nbsp;Leonel Toledo Sesma","doi":"10.1007/s10714-025-03363-8","DOIUrl":"10.1007/s10714-025-03363-8","url":null,"abstract":"<div><p>In this work, we explore non-commutative effects in fractional classical and quantum schemes using the anisotropic Bianchi type I cosmological model coupled to a scalar field in the K-essence formalism. We introduce non-commutative variables considering that all minisuperspace variables <span>(q^{i}_{nc})</span> do not commute, so the symplectic structure was modified, resulting in some changes concerning the traditional formalism. In the quantum regime, the probability density presents a new structure in the scalar field corresponding to the value of the non-commutative parameter.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026535","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
Covariant single-field formulation of effective cosmological bounces 有效宇宙弹跳的协变单场公式
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-22 DOI: 10.1007/s10714-025-03357-6
Marcello Miranda
{"title":"Covariant single-field formulation of effective cosmological bounces","authors":"Marcello Miranda","doi":"10.1007/s10714-025-03357-6","DOIUrl":"10.1007/s10714-025-03357-6","url":null,"abstract":"<div><p>This study explores the feasibility of an effective Friedmann equation in removing the classical Big Bang initial singularity and replacing it with a non-singular bounce occurring at a critical energy density value. In a spatially flat, homogeneous, and isotropic universe, the effective theory is obtained by introducing a function parametrically dependent on the critical energy density. This function measures the deviation from the benchmark theory, which is recovered as the critical energy density approaches infinity. Focusing on the covariant single-field formulation in viable Horndeski gravity, our analysis shows that both the effective and the benchmark theories belong to the same scalar–tensor theory, without any additional propagating degrees of freedom: the cuscuton and extended cuscuton models.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03357-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142991937","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
Mass and topology of hypersurfaces in static perfect fluid spaces 静态完美流体空间中超曲面的质量和拓扑结构
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-20 DOI: 10.1007/s10714-025-03362-9
Maria Andrade, Benedito Leandro, Thamara Policarpo
{"title":"Mass and topology of hypersurfaces in static perfect fluid spaces","authors":"Maria Andrade,&nbsp;Benedito Leandro,&nbsp;Thamara Policarpo","doi":"10.1007/s10714-025-03362-9","DOIUrl":"10.1007/s10714-025-03362-9","url":null,"abstract":"<div><p>We investigate the topological implications of stable minimal surfaces existing in a static perfect fluid space while ensuring that the fluid satisfies certain energy conditions. Based on the main findings, the topology of the level set <span>({f=c})</span> (the boundary of a stellar model) is studied, where <i>c</i> is a positive constant and <i>f</i> is the static potential of a static perfect fluid space. Bounds for the Hawking mass for the level set <span>({f=c})</span> of a static perfect fluid space are derived. Consequently, we prove an inequality that resembles the Penrose inequality for compact and non-compact static perfect fluid spaces, guaranteeing that the Hawking mass is positive for a class of surfaces in a static perfect fluid space. We will present a section dedicated to examples of static stellar models, one of them inspired by Witten’s black hole (or Hamilton’s cigar).\u0000\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142989917","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 Background Independent Algebra in Quantum Gravity 量子引力中的背景独立代数
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-18 DOI: 10.1007/s10714-025-03360-x
Edward Witten
{"title":"A Background Independent Algebra in Quantum Gravity","authors":"Edward Witten","doi":"10.1007/s10714-025-03360-x","DOIUrl":"10.1007/s10714-025-03360-x","url":null,"abstract":"<div><p>I consider the algebra of operators along the world line of an observer as a background independent algebra in quantum gravity.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142989290","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
Differential curvature invariants and event horizon detection for accelerating Kerr–Newman black holes in (anti-)de Sitter spacetime （反）德西特时空中加速Kerr-Newman黑洞的微分曲率不变量和事件视界探测
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-16 DOI: 10.1007/s10714-024-03348-z
G. V. Kraniotis
{"title":"Differential curvature invariants and event horizon detection for accelerating Kerr–Newman black holes in (anti-)de Sitter spacetime","authors":"G. V. Kraniotis","doi":"10.1007/s10714-024-03348-z","DOIUrl":"10.1007/s10714-024-03348-z","url":null,"abstract":"<div><p>We compute analytically differential curvature invariants for accelerating, rotating and charged black holes with a cosmological constant <span>(varLambda )</span>. Specifically, we compute novel closed-form expressions for the Karlhede and the Abdelqader-Lake invariants, for accelerating Kerr–Newman black holes in (anti-)de Sitter spacetime or subsets thereof with the aim of detecting physically relevant surfaces, like horizons and ergospheres. We explicitly show that some of the computed invariants of the particular class of spacetimes are vanishing at the event, Cauchy and acceleration horizons or ergosurface. Using the Bianchi identities we calculate in the Newman-Penrose tetrad formalism in closed-form the Page-Shoom curvature invariant for the general class of accelerating, rotating and charged Plebański-Demiański black holes with <span>(varLambda not =0)</span> and we prove that is zero at the relevant surfaces. For the invariants that vanish at horizon radii we show that are non-zero everywhere else, or in the case there are additional roots such roots do not affect their capability to detect the physically relevant surfaces. Such curvature invariants are locally measurable quantities and thus could allow the local experimental detection of the event and acceleration horizons or outer ergosurface. The differential invariants which are norms associated with the gradients of the first two Weyl invariants, are explored in detail. Although both locally single out the horizons, their global behaviour is also intriguing. Both reflect the background angular momentum and electric charge as the volume of space allowing a timelike gradient decreases with increasing spin and charge.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987811","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
Kaluza–Klein bubble with massive scalar field 具有大质量标量场的Kaluza-Klein泡
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-15 DOI: 10.1007/s10714-025-03350-z
Darrell Jackson
{"title":"Kaluza–Klein bubble with massive scalar field","authors":"Darrell Jackson","doi":"10.1007/s10714-025-03350-z","DOIUrl":"10.1007/s10714-025-03350-z","url":null,"abstract":"<div><p>A well-known soliton (bubble) solution of five-dimensional Kaluza–Klein General Relativity is modified by imposing mass on the scalar field. By forcing the scalar field to be short-range, the failure of the original bubble solution to satisfy the equivalence principle is remedied, and the bubble acquires gravitational mass. Most importantly, the mass is quantized, even in this classical setting, and has a value <span>(m_P / (4 sqrt{alpha }))</span>, where <span>(m_P)</span> is the Planck mass, and <span>(alpha )</span> is the fine-structure constant. This result applies for any choice of scalar-field mass, as it is an attractor for the field equations.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03350-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981539","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
Same as ever: looking for (in)variants in the black holes landscape 一如既往：寻找黑洞景观中的（不）变体
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-13 DOI: 10.1007/s10714-025-03351-y
Carlos A. R. Herdeiro
{"title":"Same as ever: looking for (in)variants in the black holes landscape","authors":"Carlos A. R. Herdeiro","doi":"10.1007/s10714-025-03351-y","DOIUrl":"10.1007/s10714-025-03351-y","url":null,"abstract":"<p><i>\"Is it a goose, a duck or a swan?\"</i>—asked the alien. <i>\"I do not know; and to</i> <i><u>know</u></i> <i>we have to look</i> <i><u>closer</u></i>.\"—said the earthling. <i>\"But even from here we can see it has webbed feet... so it is not a chicken.\" </i></p>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-025-03351-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142974538","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
Black holes beyond General Relativity 广义相对论之外的黑洞
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-13 DOI: 10.1007/s10714-024-03333-6
Enrico Barausse, Jutta Kunz
{"title":"Black holes beyond General Relativity","authors":"Enrico Barausse,&nbsp;Jutta Kunz","doi":"10.1007/s10714-024-03333-6","DOIUrl":"10.1007/s10714-024-03333-6","url":null,"abstract":"<div><p>Here, we will discuss some ideas for possible classical/semi-classical modifications of the black hole solutions in General Relativity (GR). These modifications/extensions include black holes in higher dimensions; black holes with additional gravitational fields, or fields beyond the Standard Model of Particle Physics; black holes in alternative classical theories of gravity and in semiclassical gravity; phenomenological models that extend the GR black hole solutions.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"57 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-024-03333-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142968158","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
首页 上一页
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：604180095
Book学术官方微信