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General Relativity and Gravitation最新文献

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Quantum theory of the Lemaître model for gravitational collapse
IF 2.8 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, Hamid Mohaddes","doi":"10.1007/s10714-025-03349-6","DOIUrl":"https://doi.org/10.1007/s10714-025-03349-6","url":null,"abstract":"<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>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"10 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","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":"","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
IF 2.8 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, Stefano Liberati","doi":"10.1007/s10714-025-03356-7","DOIUrl":"https://doi.org/10.1007/s10714-025-03356-7","url":null,"abstract":"<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>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"37 1","pages":""},"PeriodicalIF":2.8,"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
IF 2.8 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, J. Juan Rosales, Leonel Toledo Sesma","doi":"10.1007/s10714-025-03363-8","DOIUrl":"https://doi.org/10.1007/s10714-025-03363-8","url":null,"abstract":"<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>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"43 1","pages":""},"PeriodicalIF":2.8,"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
Simulating black hole imposters
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-24 DOI: 10.1007/s10714-025-03354-9
Frans Pretorius
{"title":"Simulating black hole imposters","authors":"Frans Pretorius","doi":"10.1007/s10714-025-03354-9","DOIUrl":"https://doi.org/10.1007/s10714-025-03354-9","url":null,"abstract":"<p>I briefly describe motivation for, and the current state of research into understanding the structure and dynamics of black hole “imposters”: objects that could be misidentified as Kerr black holes given the current precision of LIGO/Virgo gravitational wave observations, or EHT accretion disk measurements. I use the term “weak imposter” to describe an object which is a black hole, i.e. it has an event horizon, but whose structure and dynamics is governed by a modified gravity theory. At the other end of the spectrum are “strong imposters”: hypothetical horizonless, compact objects conjectured to form instead of black holes during gravitational collapse. To discover or rule-out imposters will require a quantitative understanding of their merger dynamics. This is hampered at present by a dearth of well-posed theoretical frameworks to describe imposters beyond perturbations of Kerr black holes and their general relativistic binary dynamics. That so little is known about non-perturbative modifications to dynamical, strongfield gravity is, I argue, due to a lamppost effect.</p>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"74 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026536","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
Inflation and acceleration of the universe from nonminimal coupling gravity with nonlinear electrodynamics
IF 2.8 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-23 DOI: 10.1007/s10714-025-03358-5
Chilwatun Nasiroh, Ramy F. Izzah, Fiki T. Akbar, Bobby E. Gunara
{"title":"Inflation and acceleration of the universe from nonminimal coupling gravity with nonlinear electrodynamics","authors":"Chilwatun Nasiroh, Ramy F. Izzah, Fiki T. Akbar, Bobby E. Gunara","doi":"10.1007/s10714-025-03358-5","DOIUrl":"https://doi.org/10.1007/s10714-025-03358-5","url":null,"abstract":"<p>In this paper, we consider a nonminimal coupling model between gravity and nonlinear electrodynamics with cosmological constant. This cosmological model is designed to account for both the inflationary epoch of the early universe and the current phase of accelerated cosmic expansion. The nonlinear electrodynamic fields provide a mechanism for a graceful exit from the inflationary period, preventing the universe from entering an eternal inflation state. The addition of nonminimal coupling plays a crucial role in shaping the early evolution of the universe. We compare the theoretical predictions of our model with recent observational data and other leading cosmological models, showing that our approach provides a viable and competitive explanation for key aspects of the universe’s evolution. Our results suggest that this model offers a consistent and compelling framework to explain both early-time inflation and the late-time accelerated expansion of the universe, in line with current observations.\u0000</p>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"17 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026534","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
Horizon-bound objects: Kerr–Vaidya solutions 视界对象：Kerr-Vaidya解
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-22 DOI: 10.1007/s10714-024-03345-2
Pravin K. Dahal, Swayamsiddha Maharana, Fil Simovic, Daniel R. Terno
{"title":"Horizon-bound objects: Kerr–Vaidya solutions","authors":"Pravin K. Dahal,&nbsp;Swayamsiddha Maharana,&nbsp;Fil Simovic,&nbsp;Daniel R. Terno","doi":"10.1007/s10714-024-03345-2","DOIUrl":"10.1007/s10714-024-03345-2","url":null,"abstract":"<div><p>Kerr–Vaidya metrics are the simplest dynamical axially-symmetric solutions, all of which violate the null energy condition and thus are consistent with the formation of a trapped region in finite time according to distant observers. We examine different classes of Kerr–Vaidya metrics, and find two which possess spherically-symmetric counterparts that are compatible with the finite formation time of a trapped region. These solutions describe evaporating black holes and expanding white holes. We demonstrate a consistent description of accreting black holes based on the ingoing Kerr–Vaidya metric with increasing mass, and show that the model can be extended to cases where the angular momentum to mass ratio varies. For such metrics we describe conditions on their dynamical evolution required to maintain asymptotic flatness.Pathologies are also identified in the evaporating white hole geometry in the form of an intermediate singularity accessible by timelike observers. We also describe a generalization of the equivalence between Rindler and Schwarzschild horizons to Kerr–Vaidya black holes, and describe the relevant geometric constructions.</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/s10714-024-03345-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142991936","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
On the origin and fate of our universe 关于宇宙的起源和命运
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2025-01-20 DOI: 10.1007/s10714-025-03353-w
Cumrun Vafa
{"title":"On the origin and fate of our universe","authors":"Cumrun Vafa","doi":"10.1007/s10714-025-03353-w","DOIUrl":"10.1007/s10714-025-03353-w","url":null,"abstract":"<div><p>This brief review, intended for high energy and astrophysics researchers, explores the implications of recent theoretical advances in string theory and the Swampland program for understanding bounds on the structure of positive potentials allowed in quantum gravity. This has a bearing on both inflationary models for the early universe as well as the fate of our universe. The paper includes a review of the dS conjecture as well as the TransPlanckian Censorship Conjecture and its relation to the species scale. We provide evidence for these principles as well as what they may lead to in terms of phenomenological predictions.</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":"142991273","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
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