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New interpretation of the original charged BTZ black hole spacetime 对原带电BTZ黑洞时空的新解释
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-24 DOI: 10.1088/1361-6382/adc9f2
Tomáš Hale, Brayden R Hull, David Kubizňák, Robert B Mann and Jana Menšíková
{"title":"New interpretation of the original charged BTZ black hole spacetime","authors":"Tomáš Hale, Brayden R Hull, David Kubizňák, Robert B Mann and Jana Menšíková","doi":"10.1088/1361-6382/adc9f2","DOIUrl":"https://doi.org/10.1088/1361-6382/adc9f2","url":null,"abstract":"In their seminal 1992 paper, Bañados, Teitelboim and Zanelli (BTZ) proposed a simple charged generalization of what is now known as the spinning BTZ black hole, the proposal being that a rotating metric can be supported by a ‘static vector’ potential. While with such an ansatz the Einstein equations are satisfied, and the corresponding energy-momentum tensor is divergence-less, the Maxwell equations do not (due to the special degenerate form of the corresponding field strength) hold. More recently, Deshpande and Lunin have proposed a generalized ‘Einstein–Maxwell’ system that yields analytic rotating black holes in all odd dimensions. In this paper, we show that the original charged BTZ solution can be re-interpreted as a solution of the Deshpande–Lunin theory. Moreover, as we shall explicitly illustrate on an example of regularized conformal electrodynamics, a similar construction also works for any non-linear electrodynamics in 3-dimensions. At the same time, all these spacetimes represent self-gravitating solutions of (non-linear electrodynamics generalized) force-free electrodynamics.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"219 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Can MAG be a predictive EFT? Radiative stability and ghost resurgence in massive vector models MAG能成为一个预测性的EFT吗？大质量矢量模型中的辐射稳定性和鬼影重现
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-23 DOI: 10.1088/1361-6382/adc9f1
Carlo Marzo
{"title":"Can MAG be a predictive EFT? Radiative stability and ghost resurgence in massive vector models","authors":"Carlo Marzo","doi":"10.1088/1361-6382/adc9f1","DOIUrl":"https://doi.org/10.1088/1361-6382/adc9f1","url":null,"abstract":"The rigorous conditions for obtaining sensible predictions in non (proper) renormalizable quantum field theories were derived a long time ago, most notably in the works of Steven Weinberg. In this paper we explicitly illustrate the challenges met in carrying this program within the affine gravity framework, in particular when attempting to pinpoint viable particle propagation. We explore the one-loop structure of some ghost and tachyon-free vector theories to illustrate the role of structural constraints in their interactions, even in the absence of gauge symmetries. Despite the presence of soft-breaking terms, we show how hopes of casting a vector model within the predictive frame of effective field methods hinges on adopting a gauge-like treatment of their interactions. Our focus here is restricted to negative results and no-go theorems, while a forthcoming companion paper will explore viable examples and constructive scenarios.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"71 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143863010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Space weather predictions for LISA during solar cycle 26 LISA在太阳活动周期26期间的空间天气预报
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-23 DOI: 10.1088/1361-6382/adcb13
C Grimani, M Fabi, F Sabbatini, M Villani
{"title":"Space weather predictions for LISA during solar cycle 26","authors":"C Grimani, M Fabi, F Sabbatini, M Villani","doi":"10.1088/1361-6382/adcb13","DOIUrl":"https://doi.org/10.1088/1361-6382/adcb13","url":null,"abstract":"The impact of space weather on space mission performance is a subject of extensive study by both scientists and space agencies. In this work, we discuss solar activity, the characterization of the interplanetary medium and the fluxes of solar and galactic particles after 2035, when laser interferometer space antenna (LISA), the first interferometer for low-frequency gravitational wave detection in space, is expected to be launched. According to the lessons learned with LISA Pathfinder, the precursor mission of LISA, we focus on interplanetary phenomena that have been demonstrated to affect mission performance. The results of the study presented here can be considered in any investigation concerning the internal charging of the LISA spacecraft.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"108 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143863009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Mimicking a rotating black hole with nonlinear electrodynamics 用非线性电动力学模拟旋转黑洞
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-23 DOI: 10.1088/1361-6382/adcb16
Érico Goulart, Eduardo Bittencourt
{"title":"Mimicking a rotating black hole with nonlinear electrodynamics","authors":"Érico Goulart, Eduardo Bittencourt","doi":"10.1088/1361-6382/adcb16","DOIUrl":"https://doi.org/10.1088/1361-6382/adcb16","url":null,"abstract":"We exhibit the first analogue model of a rotating black hole constructed in the framework of nonlinear electrodynamics. The background electromagnetic field is assumed to be algebraically special and adapted to a geodesic shear-free congruence of null rays in Minkowski spacetime, the Kerr congruence. The corresponding optical metric has a Kerr–Schild form and, it is shown to be characterized by three parameters, thus predicting the existence of an ergosurface, a horizon, and a slice identical to one also present in the Kerr metric.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"9 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143862995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Chiral soft algebras for N=2 gauge theory N=2规范理论的手性软代数
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-23 DOI: 10.1088/1361-6382/adcb15
Erin Crawley, Andrew Strominger, Adam Tropper
{"title":"Chiral soft algebras for N=2 gauge theory","authors":"Erin Crawley, Andrew Strominger, Adam Tropper","doi":"10.1088/1361-6382/adcb15","DOIUrl":"https://doi.org/10.1088/1361-6382/adcb15","url":null,"abstract":"Some time ago, Seiberg and Witten solved for moduli spaces of vacua parameterized by scalar vacuum expectation values in <inline-formula>\u0000<tex-math><?CDATA $mathcal{N} = 2$?></tex-math><mml:math overflow=\"scroll\"><mml:mrow><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mo>=</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math><inline-graphic xlink:href=\"cqgadcb15ieqn2.gif\"></inline-graphic></inline-formula> gauge theories. More recently, new vacua associated to soft theorems and asymptotic symmetries have been found. This paper takes some first steps towards a complete picture of the infrared geometry of <inline-formula>\u0000<tex-math><?CDATA $mathcal{N} = 2$?></tex-math><mml:math overflow=\"scroll\"><mml:mrow><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mo>=</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math><inline-graphic xlink:href=\"cqgadcb15ieqn3.gif\"></inline-graphic></inline-formula> gauge theory incorporating both of these infrared structures.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"7 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143863008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 particle creation by cosmic strings in de Sitter spacetime 德西特时空中的宇宙弦创造量子粒子
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-21 DOI: 10.1088/1361-6382/adcb12
Bilgehan Barış Öner and Özlem Yeşiltaş
{"title":"Quantum particle creation by cosmic strings in de Sitter spacetime","authors":"Bilgehan Barış Öner and Özlem Yeşiltaş","doi":"10.1088/1361-6382/adcb12","DOIUrl":"https://doi.org/10.1088/1361-6382/adcb12","url":null,"abstract":"This paper explores the phenomenon of particle creation associated with cosmic strings (CS) in de Sitter spacetime, a model that represents the Universe’s exponential expansion. We examine how the presence of CSs in a de Sitter background affects particle production, focusing on the roles of string tension and angular deficits. Utilizing the Klein–Gordon equation adapted to curved spacetime with CS defects, we derive solutions expressed through hypergeometric functions to describe particle states. Our findings highlight how string properties influence particle creation rates and energy distributions. By analyzing both point-like and linear potentials near the string, we determine exact solutions, investigate asymptotic behaviors, and calculate particle creation probabilities using Bogoliubov transformations.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"43 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143857433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Searching for the classical version of Hawking radiation and screening of Coulomb field by the horizon 寻找霍金辐射的经典版本和地平线对库仑场的屏蔽
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-21 DOI: 10.1088/1361-6382/adc9f3
S A Paston and D S Shatkov
{"title":"Searching for the classical version of Hawking radiation and screening of Coulomb field by the horizon","authors":"S A Paston and D S Shatkov","doi":"10.1088/1361-6382/adc9f3","DOIUrl":"https://doi.org/10.1088/1361-6382/adc9f3","url":null,"abstract":"We investigate the possibility of the existence of a classical version of Hawking radiation—solutions to classical field equations that consist solely of outgoing waves, in the spacetime of a collapsing black hole (BH). The non-static nature of the corresponding metric results in the absence of energy conservation for matter, which could otherwise a priori prohibit such solutions. A specific and simple scenario is considered: a BH formation as a result of the collapse of a thin shell, which is not necessarily dust-like. In the corresponding spacetime, we study solutions of the equations for a real massless scalar field that take the form of purely outgoing waves. In addition to the homogeneous equation, we also examine the case of a constant point source of the field located at the symmetry center. The general solution outside the shell is expressed in terms of the confluent Heun function, while the equations inside the shell and the matching conditions at its surface are formulated as an integral equation. The analysis of various solution asymptotics enables the reduction of the integral equation to a matrix equation, which is subsequently solved numerically.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"11 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143857380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
An asymptotic characterisation of the Kerr spacetime 克尔时空的渐近表征
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-21 DOI: 10.1088/1361-6382/adc9f4
R Sansom and J A Valiente Kroon
{"title":"An asymptotic characterisation of the Kerr spacetime","authors":"R Sansom and J A Valiente Kroon","doi":"10.1088/1361-6382/adc9f4","DOIUrl":"https://doi.org/10.1088/1361-6382/adc9f4","url":null,"abstract":"We provide a characterisation of the Kerr spacetime close to future null infinity using the asymptotic characteristic initial value problem in a conformally compactified spacetime. Stewart’s gauge is used to set up the past-oriented characteristic initial value problem. By a theorem of M. Mars characterising the Kerr spacetime, we provide conditions for the existence of an asymptotically timelike Killing vector on the development of the initial data by demanding that the spacetime is endowed with a Killing spinor. The conditions on the characteristic initial data ensuring the existence of a Killing spinor are, in turn, analysed. Finally, we write the conditions on the initial data in terms of the free data in the characteristic initial value problem. As a result, we characterise the Kerr spacetime using only a section of future null infinity and its intersection with an outgoing null hypersurface.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"91 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143857432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Wick rotation in the lapse, admissible complex metrics, and foliation changing diffeomorphisms 失效中的威克旋转、可容许复度量和叶状变化的差分变形
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-21 DOI: 10.1088/1361-6382/adc9ef
Rudrajit Banerjee and Max Niedermaier
{"title":"Wick rotation in the lapse, admissible complex metrics, and foliation changing diffeomorphisms","authors":"Rudrajit Banerjee and Max Niedermaier","doi":"10.1088/1361-6382/adc9ef","DOIUrl":"https://doi.org/10.1088/1361-6382/adc9ef","url":null,"abstract":"A Wick rotation in the lapse (not in time) is introduced that interpolates between Riemannian and Lorentzian metrics on real manifolds admitting a codimension-one foliation. The definition refers to a fiducial foliation but covariance under foliation changing diffeomorphisms can be rendered explicit in a reformulation as a rank one perturbation. Applied to scalar field theories a Lorentzian signature action develops a positive imaginary part thereby identifying the underlying complex metric as ‘admissible’. This admissibility is ensured in non-fiducial foliations in technically distinct ways also for the variation with respect to the metric and for the Hessian. The Hessian of the Wick rotated action is a complex combination of a generalized Laplacian and a d’Alembertian, which is shown to have spectrum contained in a wedge of the upper complex half plane. Specialized to near Minkowski space the induced propagator differs from the one with the Feynman prescription and on Friedmann-Lemaître backgrounds the difference to a Wick rotation in time is illustrated.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"16 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143857378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Twisted geometric parametrization of holonomy-flux phase space in all dimensional loop quantum gravity 全维环量子引力中完整通量相空间的扭曲几何参数化
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-21 DOI: 10.1088/1361-6382/adcb14
Gaoping Long
{"title":"Twisted geometric parametrization of holonomy-flux phase space in all dimensional loop quantum gravity","authors":"Gaoping Long","doi":"10.1088/1361-6382/adcb14","DOIUrl":"https://doi.org/10.1088/1361-6382/adcb14","url":null,"abstract":"The regularization of the scalar constraint and the Fermion coupling problem indicate that it is necessary to consider some kind of gauge fixing methods to deal with the simplicity constraint in all dimensional loop quantum gravity (LQG). The coherent state with well-behaved peakedness property is an essential ingredient to carry out the gauge fixing method. To provide the basic tool for constructing such kind of coherent state, we generalize the twisted geometry parametrization of the holonomy-flux phase space of -dimensional LQG from the edge simplicity constraint surface to the full holonomy-flux phase space. The symplectic structure on the twisted geometric parameter space and the Poisson structure in terms of the twisted geometric variables are analyzed. Besides, we discuss the relation between the two twisted geometry parametrizations constructed respectively on the edge simplicity constraint surface and the full holonomy-flux phase space. Our result shows that these two type of parametrizations are equivalent to each other by carrying out the gauge reduction with respect to the edge simplicity constraint.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"402 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143857434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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