Classical and Quantum Gravity最新文献_第10页

In-orbit calibration of the gravitational reference sensor’s stiffness for the Taiji mission 太极任务重力参考传感器刚度的在轨校准

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-08-25 DOI: 10.1088/1361-6382/ae944d

Xiaotong Wei,Shirui Liu,Xing Bian,Peng Xu,Li-E Qiang,Ziren Luo

引用次数: 0

Charged multi-sheet wormhole solutions 带电的多片虫洞溶液

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-08-25 DOI: 10.1088/1361-6382/ae9822

Yusuke Makita,Keisuke Izumi,Daisuke Yoshida

引用次数: 0

Exploring particle geodesics in a warp drive spacetime 在曲速驱动时空中探索粒子测地线

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-08-25 DOI: 10.1088/1361-6382/ae970d

Lucas Timotheo Sanches,Max Morris,Steven R Brandt

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Detector-Weighted Signatures of Localized Dissipative Transitions in Kerr EMRIs Kerr EMRIs中局域耗散跃迁的探测器加权特征

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-08-25 DOI: 10.1088/1361-6382/ae9e7c

Jingxu Wu,Liangyu Luo,Jiyun Yang,Haoxiang Ma,Jie Shi

{"title":"Detector-Weighted Signatures of Localized Dissipative Transitions in Kerr EMRIs","authors":"Jingxu Wu,Liangyu Luo,Jiyun Yang,Haoxiang Ma,Jie Shi","doi":"10.1088/1361-6382/ae9e7c","DOIUrl":"https://doi.org/10.1088/1361-6382/ae9e7c","url":null,"abstract":"Abstract We study a parameterized localized modification of the dissipative evolution in a circular equatorial Kerr extreme mass-ratio inspiral (EMRI). We do not claim a unique mapping to a specific hadron--quark equation of state; instead, the transition sector is treated as a localized flux deformation with parameters ${A_{rm tr},f_c,Delta f,p,q}$. The reference inspiral uses real Teukolsky flux data from the Black Hole Perturbation Toolkit texttt{CircularOrbitSelfForceData} repository, interpolating the tabulated Kerr circular-orbit fluxes in radius and spin. For a representative system with $M=2times10^{5}M_odot$, $mu=1.4M_odot$, $hat a=0.90$, $A_{rm tr}=10^{-6}$, $f_c=0.0165~{rm Hz}$, and $Delta f=0.009~{rm Hz}$, we normalize the baseline waveform to $rho_{rm B}=30$. The transition waveform has $rho_{rm T}=30.000$, residual norm $rho_{rm R}=2.948$, and extrinsic-time-and-phase-maximized mismatch $mathcal M_{rm ext}=4.828times10^{-3}$. A direct three-dimensional intrinsic profile refit reduces the mismatch to $5.95times10^{-8}$ and shifts the best-fitting intrinsic parameters by $Delta M/M=-3.32times10^{-5}$, $Deltamu/mu=2.11times10^{-5}$, and $Deltahat a=-1.34times10^{-6}$. In a zero-noise (Asimov) profile-likelihood calculation, the injected Kerr point has $Deltachi^2=8.67$ relative to the profiled best fit, outside the three-parameter 95% contour but inside the 99% contour for the adopted simplified likelihood. We also perform a six-parameter Fisher projection, but its condition number is $1.82times10^{17}$ and the finite-difference step test does not converge; we therefore treat it only as a diagnostic of tangent-space degeneracy. The robust conclusion is that localized dissipative transitions can remain highly overlapping with nearby Kerr waveforms while producing detector-weighted residuals and a nominally significant profile-likelihood displacement in this restricted zero-noise waveform model.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"493 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893791","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

Evaluation of magnetic torque noise of the test mass for space-borne gravitational wave detection 星载引力波探测试验质量磁转矩噪声评价

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-08-25 DOI: 10.1088/1361-6382/ae9e7d

Qiqi Xu,Yancong Huo,Wei Su,Yanchong Liu,Li Liu,Hao Yan,Yiqiu Ma,Butian Zhang,Shun Wang,Zebing Zhou

{"title":"Evaluation of magnetic torque noise of the test mass for space-borne gravitational wave detection","authors":"Qiqi Xu,Yancong Huo,Wei Su,Yanchong Liu,Li Liu,Hao Yan,Yiqiu Ma,Butian Zhang,Shun Wang,Zebing Zhou","doi":"10.1088/1361-6382/ae9e7d","DOIUrl":"https://doi.org/10.1088/1361-6382/ae9e7d","url":null,"abstract":"Abstract Space-based gravitational wave detection imposes extremely stringent requirements on the acceleration noise of test mass (TM), with magnetic effect being one of the significant noise sources. Prior assessments of magnetic effects have only considered the translational acceleration of the center of mass. This work systematically evaluates the disturbing forces and torques produced by magnetic effects on all six degrees of freedom, with particular emphasis on the magnetic torque noise and the resulting force noise coupled into the sensitive axis. Based on the derivation of magnetic potential energy, a finite element calculation method for estimating magnetic torque noise is established, which incorporates the spatial distributions of both the residual magnetic moment and the magnetic susceptibility. The resulting residual acceleration noise along the optical sensitive axis is then calculated, taking into account the crosstalk effects of the center-of-mass to centroid offset, electrostatic coupling, and TM-laser interferometer coupling. This noise lies on the order of 10 -17 ms -2 Hz -1/2 @0.1 mHz. The results indicate that the main contribution to magnetic torque noise comes from the coupling between the residual magnetic moment and the spacecraft's magnetic field, while the contribution from magnetic inhomogeneity accounts for 16%.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"15 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893786","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

Integrability of conformal Killing vectors in the Eisenhart lift of scalar-field FLRW cosmology 标量场FLRW宇宙学中共形杀伤向量的可积性

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-08-04 DOI: 10.1088/1361-6382/ae8b53

Takeshi Chiba and Tsuyoshi Houri

引用次数: 0

Electric Penrose process in spherically symmetric regular black holes with and without a cosmological constant 有或没有宇宙常数的球对称规则黑洞中的电彭罗斯过程

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-08-04 DOI: 10.1088/1361-6382/ae8e25

Haowei Chen, Hengyu Xu, Yizhi Zhan and Shao-Jun Zhang

{"title":"Electric Penrose process in spherically symmetric regular black holes with and without a cosmological constant","authors":"Haowei Chen, Hengyu Xu, Yizhi Zhan and Shao-Jun Zhang","doi":"10.1088/1361-6382/ae8e25","DOIUrl":"https://doi.org/10.1088/1361-6382/ae8e25","url":null,"abstract":"We investigate the electric Penrose process in Ayón–Beato–García (ABG) black holes (BH), both in the presence and absence of a cosmological constant, presenting, to the best of our knowledge, the first such analysis within the context of regular BHs. Our study systematically examines the effects of BH charge and the cosmological constant on the formation of negative-energy states and the efficiency of energy extraction. Compared to Reissner–Nordström (RN) BHs, ABG BHs exhibit a significantly larger negative-energy region, enabling the electric Penrose process to operate at larger distances from the event horizon and achieve higher energy extraction efficiency. This enhancement is particularly pronounced near the event horizon, where the performance gap widens with increasing BH charge. Notably, even for astrophysically realistic values of charge and cosmological constant that approach vanishingly small values, distinct differences persist, yielding a maximum efficiency ratio of approximately . These results suggest that, in realistic astrophysical scenarios, ABG BHs can accelerate charged particles more efficiently and serve as more powerful engines for energy extraction than their RN counterparts.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"37 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675193","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 general formalism for coupling scalar fields to the Einstein equations without a variational principle 无变分原理下标量场与爱因斯坦方程耦合的一般形式

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-08-04 DOI: 10.1088/1361-6382/ae8e26

J Ritchie

引用次数: 0

Non-parametric reconstruction of the Hubble parameter from the fourth gravitational wave transient catalog and DESI baryonic acoustic oscillations 第四次引力波瞬态目录和DESI重子声学振荡的哈勃参数非参数重建

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-08-04 DOI: 10.1088/1361-6382/ae849b

Grégoire Pierra, Alberto Colombo and Simone Mastrogiovanni

{"title":"Non-parametric reconstruction of the Hubble parameter from the fourth gravitational wave transient catalog and DESI baryonic acoustic oscillations","authors":"Grégoire Pierra, Alberto Colombo and Simone Mastrogiovanni","doi":"10.1088/1361-6382/ae849b","DOIUrl":"https://doi.org/10.1088/1361-6382/ae849b","url":null,"abstract":"The release of the fourth Gravitational-Wave Transient Catalog (GWTC-4.0) by the LIGO–Virgo–KAGRA collaboration includes more than 200 compact binary coalescence candidates that can be used to probe the cosmic expansion. The population of merging binary black holes (BBHs) has been used so far to provide a constraint on the Hubble constant and dark matter fraction under the hypothesis of a flat- -Cold-Dark-Matter Universe. In this work, we provide the first non-parametric constraint on the Hubble parameter from 137 dark sirens reported in GWTC-4.0. We employ the relation between detector and source frame masses for detected GW signals, to obtain a statistical redshift evaluation for the population of BBHs. We model the Hubble parameter as a non-parametric autoregressive process in terms of the scale factor, using splines. In addition, we introduce two novel features: the use of anchor points for derived from an external probe—here, baryon acoustic oscillations — and a constraining power coefficient that quantifies where the inference is most data-driven by GW detections. We highlight three key findings: (i) using GWs alone, the Hubble parameter determination is the most GW-data-driven around redshift , yielding to . Its value at , the Hubble constant, is therefore less constrained by the GW data. (ii) The Hubble parameter inferred from analyses assuming a flat- CDM cosmological model is strongly affected by the cosmological model assumption. (iii) Introducing an anchor point for enhances the inferred constraints and provides a clear visualization of the redshift range where GWs contribute most to the constraining power.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"9 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675189","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

On regular black string spacetimes in nonlinear electrodynamics 非线性电动力学中的正则黑弦时空

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-08-03 DOI: 10.1088/1361-6382/ae8a0a

G Alencar, V H U Borralho, T M Crispim and M S Cunha

{"title":"On regular black string spacetimes in nonlinear electrodynamics","authors":"G Alencar, V H U Borralho, T M Crispim and M S Cunha","doi":"10.1088/1361-6382/ae8a0a","DOIUrl":"https://doi.org/10.1088/1361-6382/ae8a0a","url":null,"abstract":"In this work, we investigate the coupling of general relativity with nonlinear electrodynamics (NED), governed by a general Lagrangian , to address the axial singularity of four-dimensional black strings. Through a model-independent analysis, we scrutinize the viability of regular configurations by extending no-go theorems, originally formulated for spherical spacetimes, to cylindrical symmetries. We provide a comprehensive mathematical proof that regular, purely electric black strings cannot be generated by any NED Lagrangian that recovers the Maxwell limit in the weak-field regime, establishing a fundamental constraint for cylindrical topologies. Despite these limitations, we employ specific mathematical frameworks to construct new exact solutions for black strings, including cylindrical analogues of the well-known Bardeen and Hayward regular black hole classes. Each solution is analytically derived, and we demonstrate that their curvature invariants remain finite everywhere, effectively replacing the axial singularity with a regular core. Furthermore, we evaluate the physical consistency of these new metrics by subjecting them to stringent causality and unitarity constraints. Our results provide a comprehensive classification of the conditions under which NED can regularize cylindrical spacetimes and offer new insights into how topological differences between spherical and axial symmetries influence the global structure and the physical viability of non-singular gravitational objects in nonlinear gauge theories.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"157 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675191","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