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Twistorial chiral algebras in higher dimensions 高维涡旋手性代数
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-06-22 DOI: 10.1088/1361-6382/ade35c
Tim Adamo and Iustin Surubaru
{"title":"Twistorial chiral algebras in higher dimensions","authors":"Tim Adamo and Iustin Surubaru","doi":"10.1088/1361-6382/ade35c","DOIUrl":"https://doi.org/10.1088/1361-6382/ade35c","url":null,"abstract":"In four spacetime dimensions, the classically integrable self-dual sectors of gauge theory and gravity have associated chiral algebras, which emerge naturally from their description in twistor space. We show that there are similar chiral algebras associated to integrable sectors of gauge theory and gravity whenever the spacetime dimension is an integer multiple of four. In particular, the hyperkähler sector of gravity and the hyperholomorphic sector of gauge theory in 4m-dimensions have well-known twistor descriptions giving rise to chiral algebras. Using twistor sigma models to describe these sectors, we demonstrate that the chiral algebras in higher-dimensions also arise as soft symmetry algebras under a certain notion of collinear limit. Interestingly, the chiral algebras and collinear limits in higher-dimensions are defined on the 2-sphere, rather than the full celestial sphere.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"9 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144340943","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
Thermodynamic topological classes of the rotating, accelerating black holes 旋转加速黑洞的热力学拓扑分类
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-06-19 DOI: 10.1088/1361-6382/ade35b
Wentao Liu, Li Zhang, Di Wu and Jieci Wang
{"title":"Thermodynamic topological classes of the rotating, accelerating black holes","authors":"Wentao Liu, Li Zhang, Di Wu and Jieci Wang","doi":"10.1088/1361-6382/ade35b","DOIUrl":"https://doi.org/10.1088/1361-6382/ade35b","url":null,"abstract":"In this paper, we investigate the topological numbers for the rotating, accelerating neutral black hole and its AdS extension, as well as the rotating, accelerating charged black hole and its AdS extension. We find that the topological number of an asymptotically flat accelerating black hole consistently differs by one from that of its non-accelerating counterpart. Furthermore, we show that for an asymptotically AdS accelerating black hole, the topological number is reduced by one compared to its non-accelerating AdS counterpart. In addition, we demonstrate that within the framework of general relativity, the acceleration parameter and the negative cosmological constant each independently add one to the topological number. However, when both factors are present, their effects neutralize each other, resulting in no overall change to the topological number.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"44 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329319","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
Determining parameters of Kerr–Newman black holes by shadow observation from finite distance and spatial infinity 利用有限距离和无限空间的阴影观测确定Kerr-Newman黑洞的参数
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-06-19 DOI: 10.1088/1361-6382/ade047
Kenta Hioki and Umpei Miyamoto
{"title":"Determining parameters of Kerr–Newman black holes by shadow observation from finite distance and spatial infinity","authors":"Kenta Hioki and Umpei Miyamoto","doi":"10.1088/1361-6382/ade047","DOIUrl":"https://doi.org/10.1088/1361-6382/ade047","url":null,"abstract":"We present a method for determining the physical parameters of a Kerr–Newman black hole through shadow observation. In a system comprising a Kerr–Newman black hole, an observer, and a light source, the relevant parameters are mass M, specific angular momentum a, electric charge Q, inclination angle i, and distance ro. We consider the cases where the observer is at either a finite distance or spatial infinity. Using our method, the dimensionless parameters can be determined by observing the shadow contour of the Kerr–Newman black hole from spatial infinity. We analytically prove that the shadow contour of the Kerr–Newman black hole observed from spatial infinity is unique, where uniqueness is defined as the absence of two congruent shadow contours for distinct sets of dimensionless parameter values. This method is versatile and can be applied to a range of black hole solutions with charge. Additionally, we show analytically that the shadow contour of a Kerr–Newman black hole observed from a finite distance ro is degenerate (not unique), meaning that the parameters of a Kerr–Newman black hole at finite distance cannot be determined from shadow observations.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"38 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329315","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
Gauge-dependence of scalar induced gravitational waves 标量诱导引力波的尺度依赖性
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-06-19 DOI: 10.1088/1361-6382/ade2b3
Anjali Abirami Kugarajh
{"title":"Gauge-dependence of scalar induced gravitational waves","authors":"Anjali Abirami Kugarajh","doi":"10.1088/1361-6382/ade2b3","DOIUrl":"https://doi.org/10.1088/1361-6382/ade2b3","url":null,"abstract":"In this review we look into the gauge-dependence of scalar-induced gravitational waves (SIGWs) that are second-order tensors produced by first-order scalar modes. The method includes deriving the background, first- and second-order Einstein field equations without imposing a gauge. We address the gauge-invariant approach and study the source-term of SIGWs in three different gauges: synchronous, Poisson, and uniform curvature gauge. We find that numerically computed kernels evaluated in a radiation epoch in all three gauges behave closely with minimal discrepancy. As expected, when going to sub-horizon modes, , the discrepancy decreases and the behavior converges, suggesting that SIGWs can be treated as gauge-invariant observables in this regime.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"1 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329316","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
De Sitter quantum gravity within the covariant Lorentzian approach to asymptotic safety 德西特量子引力在协变洛伦兹方法下的渐近安全
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-06-19 DOI: 10.1088/1361-6382/ade193
Edoardo D’Angelo, Renata Ferrero and Markus B Fröb
{"title":"De Sitter quantum gravity within the covariant Lorentzian approach to asymptotic safety","authors":"Edoardo D’Angelo, Renata Ferrero and Markus B Fröb","doi":"10.1088/1361-6382/ade193","DOIUrl":"https://doi.org/10.1088/1361-6382/ade193","url":null,"abstract":"Recent technical and conceptual advancements in the asymptotic safety approach to quantum gravity have enabled studies of the UV completion of Lorentzian Einstein gravity, emphasizing the role of the state dependence. We present here the first complete investigation of the flow equations of the Einstein–Hilbert action within a cosmological spacetime, namely de Sitter spacetime. Using the newly derived graviton propagator for general gauges and masses in de Sitter spacetime, we analyze the dependence on the gauge and on finite renormalization parameters. Our results provide evidence of a UV fixed point for the most commonly used gauges.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"15 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329416","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
Addendum: Existence and absence of Killing horizons in static solutions with symmetries (2024 Class. Quantum Grav. 41 245013) 附录：对称静态解中杀戮视界的存在与不存在（2024类）。量子重力。41 245013)
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-06-19 DOI: 10.1088/1361-6382/ade35a
Hideki Maeda and Cristián Martínez
{"title":"Addendum: Existence and absence of Killing horizons in static solutions with symmetries (2024 Class. Quantum Grav. 41 245013)","authors":"Hideki Maeda and Cristián Martínez","doi":"10.1088/1361-6382/ade35a","DOIUrl":"https://doi.org/10.1088/1361-6382/ade35a","url":null,"abstract":"In a recent paper (Maeda and Martínez 2024 Class. Quantum Grav.41 245013), we discussed regular extensions of static solutions, or more precisely solutions admitting a hypersurface-orthogonal Killing vector, with an -dimensional Einstein base manifold beyond a non-degenerate Killing horizon in general relativity in dimensions. Under the assumption that components of the energy-momentum tensor for the matter field, which are interpreted in static regions as the energy density ρ, radial pressure , and tangential pressure p2, satisfy linear relations and near the horizon, we proved proposition 6 asserting that solutions for can be extended beyond the Killing horizon and the metric in the regular single-null coordinates is at least there. Although we implicitly assumed there that the values of and in the extended dynamical region remain unchanged, regular extensions are possible even with different values as long as holds there. We present a concrete example of this regular extension in the four-dimensional spherically symmetric case using the Semiz class-I and Whittaker perfect-fluid solutions.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"38 1","pages":"129401"},"PeriodicalIF":3.5,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335096","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
The massive BMS character in 3D quantum gravity 三维量子引力中的大质量BMS特征
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-06-18 DOI: 10.1088/1361-6382/ade110
T Mursheed Amith and Alicia Castro
{"title":"The massive BMS character in 3D quantum gravity","authors":"T Mursheed Amith and Alicia Castro","doi":"10.1088/1361-6382/ade110","DOIUrl":"https://doi.org/10.1088/1361-6382/ade110","url":null,"abstract":"We derive the one-loop partition function for three-dimensional quantum gravity (QG) in a finite-radius thermal twisted flat space with a conical defect, reproducing the massive BMS3 character. We perform the computation in both discrete and continuum geometry formulations, showing consistency between them. In the discrete case, we integrate out bulk degrees of freedom in a Regge gravity framework, while in the continuum, we construct a dual non-local boundary field theory encoding geodesic length fluctuations. Our study shows that the additional modes of the massive character, compared to the vacuum case, originate from the explicit breaking of radial diffeomorphism symmetry by the defect. This provides a concrete geometric mechanism in Regge gravity, tracing the appearance of massive BMS3 particles to diffeomorphism breaking by conical defects, and highlights the broader relevance of discrete geometry approaches to QG with matter.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"29 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319766","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
Siderostat pointing: validation of an advanced line-of-sight pointing concept beyond LISA Siderostat指向：超越LISA的先进视线指向概念的验证
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-06-17 DOI: 10.1088/1361-6382/ade046
Nils Frederik Hasselmann, Beata Kunicka, Dirk Papendorf, Harald Kögel, Ulrich Johann, Dennis Weise and Alexander Sell
{"title":"Siderostat pointing: validation of an advanced line-of-sight pointing concept beyond LISA","authors":"Nils Frederik Hasselmann, Beata Kunicka, Dirk Papendorf, Harald Kögel, Ulrich Johann, Dennis Weise and Alexander Sell","doi":"10.1088/1361-6382/ade046","DOIUrl":"https://doi.org/10.1088/1361-6382/ade046","url":null,"abstract":"We present a mechanism prototype for a previously proposed advanced pointing concept for a Laser Interferometer Space Antenna-like space-based gravitational wave observatory that enables an architecture with two bi-directional interferometric laser links per S/C referenced to a single active test mass. Compared to the baseline concept, this eliminates an optical backlink connecting two individual optical benches and a massive flexing harness, significantly reducing the drag-free control’s complexity and avoiding self-gravity effects due to large moving parts. An experimental validation of the pointing jitter and creep of the pointing mechanism is performed. The general design procedure can also find application in lithography or other scenarios requiring ultra-stable manipulation of one or more opto-mechanical degrees of freedom.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"26 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144311796","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
Strongly interacting quark matter in massive quark stars 大质量夸克恒星中的强相互作用夸克物质
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-06-16 DOI: 10.1088/1361-6382/ade192
Adamu Issifu, Franciele M da Silva, Luis C N Santos, Débora P Menezes and Tobias Frederico
{"title":"Strongly interacting quark matter in massive quark stars","authors":"Adamu Issifu, Franciele M da Silva, Luis C N Santos, Débora P Menezes and Tobias Frederico","doi":"10.1088/1361-6382/ade192","DOIUrl":"https://doi.org/10.1088/1361-6382/ade192","url":null,"abstract":"This paper investigates the properties of strongly coupled matter at high baryon densities (ρB) in quark stars (QSs). The QS model is based on the density-dependent quark mass (DDQM) framework, modified DDQM (MDDQM) by enhancing the single-gluon interaction to generate higher repulsive pressure. The model parameters are constrained using Bayesian inference, incorporating observational data from the pulsars HESS J1731 347, PSR J0030 0451, PSR J0740 6620, and PSR J0952 0607. Our results show that the MDDQM model produces QSs with higher mass and compactness compared to the DDQM model. Among the four MDDQM parameterizations studied, two yield maximum star masses of 1.86 and 2.10 and exhibit near-conformal behavior in the underlying quark matter (QM). The other two parameterizations, yielding QS masses of 2.30 and 2.37 , correspond to a stronger interaction in the underlying QM. These findings provide important insights into the equation of state of deconfined QM and its implications for the structure and stability of QSs.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"13 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304585","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
A study of dark matter interactions with wormhole metrics in the context of f(Q) gravity 在f(Q)引力背景下暗物质与虫洞度量相互作用的研究
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-06-15 DOI: 10.1088/1361-6382/ade194
Chaitra Chooda Chalavadi, G N Lathakumari and V Venkatesha
{"title":"A study of dark matter interactions with wormhole metrics in the context of f(Q) gravity","authors":"Chaitra Chooda Chalavadi, G N Lathakumari and V Venkatesha","doi":"10.1088/1361-6382/ade194","DOIUrl":"https://doi.org/10.1088/1361-6382/ade194","url":null,"abstract":"This study explores the impact of dark matter within the f(Q) gravity framework, emphasizing its role in supporting traversable wormhole solutions. By considering anisotropic matter sources modeled through Bose–Einstein condensate and Einasto density profiles, we derive a novel class of wormhole solutions. The shape function of the wormholes is constructed using the density profile equation and modified field equations, providing a robust foundation for these solutions. The analysis includes the incorporation of a traceless fluid equation of state, which reveals the intricate influence of dark matter on the existence and stability of wormhole structures. To ensure physical plausibility, specific parameter choices are made, confirming that the proposed solutions meet all essential conditions for traversable wormholes. Furthermore, energy conditions are systematically evaluated under four distinct scenarios, and embedding techniques are applied to gain deeper insights into the wormhole geometries. Next, we extend our study to analyze the volume integral quantifier and the anisotropic effect. This work provides a comprehensive perspective on the interplay between dark matter and f(Q) gravity, shedding light on the feasibility of exotic spacetime configurations. Finally, the stability of the derived wormhole solutions is verified using the Tolman–Oppenheimer–Volkoff equation, demonstrating a balance of forces and the physical stability of the models.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"36 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144296017","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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