Classical and Quantum Gravity最新文献

Gravitational memory: new results from post-Newtonian and self-force theory 引力记忆：后牛顿和自力理论的新结果

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-30 DOI: 10.1088/1361-6382/adbc3d

Kevin Cunningham, Chris Kavanagh, Adam Pound, David Trestini, Niels Warburton and Jakob Neef

{"title":"Gravitational memory: new results from post-Newtonian and self-force theory","authors":"Kevin Cunningham, Chris Kavanagh, Adam Pound, David Trestini, Niels Warburton and Jakob Neef","doi":"10.1088/1361-6382/adbc3d","DOIUrl":"https://doi.org/10.1088/1361-6382/adbc3d","url":null,"abstract":"We compute the (displacement) gravitational wave memory due to a quasi-circular inspiral of two black holes using a variety of perturbative techniques. Within post-Newtonian theory, we extend previous results for non-spinning compact binaries to 3.5PN order. Using the gravitational self-force approach, we compute the memory at first order in the mass ratio for inspirals into a Kerr black hole. We do this both numerically and via a double post-Newtonian–self-force expansion which we carry out to 5PN order. At second order in the self-force approach, near-zone calculations encounter an infrared divergence associated with memory, which is resolved through matching the near-zone solution to a post-Minkowskian expansion in the far zone. We describe that matching procedure for the first time and show how it introduces nonlocal-in-time memory effects into the two-body dynamics at second order in the mass ratio, as was also predicted by recent 5PN calculations within the effective field theory approach. We then compute the gravitational-wave memory through second order in the mass ratio (excluding certain possible memory distortion effects) and find that it agrees well with recent results from numerical relativity simulations for near-comparable-mass binaries.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"39 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144520406","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

Particle dynamics and optical appearance of charged spherically symmetric black holes in bumblebee gravity 大黄蜂引力下带电球对称黑洞的粒子动力学和光学外观

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-30 DOI: 10.1088/1361-6382/ade6b9

Mou Xu, Jianbo Lu, Ruonan Li, Yu Liu and Shu-Min Wu

{"title":"Particle dynamics and optical appearance of charged spherically symmetric black holes in bumblebee gravity","authors":"Mou Xu, Jianbo Lu, Ruonan Li, Yu Liu and Shu-Min Wu","doi":"10.1088/1361-6382/ade6b9","DOIUrl":"https://doi.org/10.1088/1361-6382/ade6b9","url":null,"abstract":"In this paper, we study the particle dynamics, shadow, and optical appearance of charged black holes (BHs) in bumblebee gravity. Firstly, we find that the Lorentz-violation parameter l and charge parameter Q have opposite effects on the peak of the effective potential by analyzing timelike geodesics, and the radius of the innermost stable circular orbit decreases as the BH parameters l and Q increase. We also explore the behaviors of particle energy, angular momentum, and Keplerian frequency. Secondly, for null geodesics, both the photon sphere radius and the shadow radius decrease with increasing l and Q, and are consistently smaller than those of the Reissner–Nordström BH (RNBH) and Schwarzschild-like BH. And based on observational data reported by the event horizon telescope collaboration, we constrain the parameters l and Q by using the shadow radius data of Sgr A*. Thirdly, we explore the observation characteristics of charged BHs under three thin disk accretion models. The results show that, compared to RNBH, the increase of l leads to a greater thickness of the photon rings and lensed rings. However, due to their extremely narrow ranges, the contributions are small, and the observed intensities are mainly contributed by the direct emissions. Moreover, when the parameter l is fixed, the peaks of the observed intensities of rings decrease with increasing Q for the same emission model, and it is always lower than the corresponding value for Schwarzschild-like BH. These findings contribute to distinguishing bumblebee charged BHs from other types of BHs based on their optical appearance.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"19 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144520407","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

Symmetries of the celestial supersphere 天体超球的对称性

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-29 DOI: 10.1088/1361-6382/ade58a

Adam Tropper

引用次数: 0

On the unexpected geometrical origin of the algebra of symmetries 论对称代数的意外几何起源

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-29 DOI: 10.1088/1361-6382/ade35e

O Ramírez and Y Bonder

引用次数: 0

Quasilocal Newtonian limit of general relativity and galactic dynamics 广义相对论的准局部牛顿极限与星系动力学

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-26 DOI: 10.1088/1361-6382/ade48b

Marco Galoppo, Federico Re and David L Wiltshire

引用次数: 0

Geometric analysis for the Pontryagin action and boundary terms 庞特里亚金作用和边界项的几何分析

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-26 DOI: 10.1088/1361-6382/ade41a

Jasel Berra-Montiel, Iñaki de Santos and Alberto Molgado

{"title":"Geometric analysis for the Pontryagin action and boundary terms","authors":"Jasel Berra-Montiel, Iñaki de Santos and Alberto Molgado","doi":"10.1088/1361-6382/ade41a","DOIUrl":"https://doi.org/10.1088/1361-6382/ade41a","url":null,"abstract":"In this article, we analyse the Pontryagin model adopting different geometric-covariant approaches. In particular, we focus on the manner in which boundary conditions must be imposed on the fields describing the bulk theory in order to reproduce a well-defined theory on the boundary. At a Lagrangian level, we describe the symmetries of the theory and construct the Lagrangian covariant momentum map which allows for an extension of Noether’s theorems. Through the multisymplectic analysis we obtain the covariant momentum map associated with the action of the gauge group on the covariant multimomenta phase-space. By performing a space plus time decomposition by means of a foliation of the appropriate bundles, we are able to recover not only the t-instantaneous Lagrangian and Hamiltonian of the theory, but also the generator of the gauge transformations. In the polysymplectic framework we perform a Poisson-Hamilton analysis with the help of the De Donder–Weyl Hamiltonian and the Poisson–Gerstenhaber bracket. Remarkably, as long as we consider a background manifold with boundary, in all of these geometric formulations, we are able to recover the so-called differentiability conditions which endorse the Hamiltonian as a differentiable function, here obtained as a straightforward consequence of Noether’s theorem.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"81 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515997","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

Adaptive modeling of correlated noise in space-based gravitational wave detectors 天基引力波探测器相关噪声的自适应建模

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-26 DOI: 10.1088/1361-6382/ade51a

Ya-Nan Li, Yi-Ming Hu and En-Kun Li

引用次数: 0

Instability of marginally outer trapped surfaces from initial data set symmetry 从初始数据集对称性看边缘外捕获面的不稳定性

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-25 DOI: 10.1088/1361-6382/ade58b

Abbas M Sherif

引用次数: 0

An asymptotic systems approach for the good–bad–ugly model with application to general relativity 好-坏-丑模型的渐近系统方法及其在广义相对论中的应用

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-24 DOI: 10.1088/1361-6382/ade10f

Miguel Duarte, Justin C Feng, Edgar Gasperín and David Hilditch

{"title":"An asymptotic systems approach for the good–bad–ugly model with application to general relativity","authors":"Miguel Duarte, Justin C Feng, Edgar Gasperín and David Hilditch","doi":"10.1088/1361-6382/ade10f","DOIUrl":"https://doi.org/10.1088/1361-6382/ade10f","url":null,"abstract":"We employ an adapted version of Hörmander’s asymptotic systems method to show heuristically that the standard good–bad–ugly model admits formal polyhomogeneous asymptotic solutions near null infinity. In a related earlier approach, our heuristics were unable to capture potential leading order logarithmic terms appearing in the asymptotic solution of the good equation (the standard wave equation). Presently, we work with an improved method which overcomes this shortcoming, allowing the faithful treatment of a larger class of initial data in which such logarithmic terms are manifest. We then generalize this method to encompass models that include stratified null forms as sources and whose wave operators are built from an asymptotically flat metric. We then apply this result to the Einstein field equations in generalized harmonic gauge and compute the leading decay in R−1 of the Weyl scalars, where R is a suitably defined radial coordinate. We detect an obstruction to peeling, a decay statement on the Weyl scalars that is ensured by smoothness of null infinity. The leading order obstruction appears in Ψ2 and, in agreement with the literature, can only be suppressed by a careful choice of initial data.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"20 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144479067","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

Adjustable picometer-stable interferometers for testing space-based gravitational wave detectors 用于测试天基引力波探测器的可调皮米稳定干涉仪

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-23 DOI: 10.1088/1361-6382/ade1c7

Marcel Beck, Shreevathsa Chalathadka Subrahmanya and Oliver Gerberding

{"title":"Adjustable picometer-stable interferometers for testing space-based gravitational wave detectors","authors":"Marcel Beck, Shreevathsa Chalathadka Subrahmanya and Oliver Gerberding","doi":"10.1088/1361-6382/ade1c7","DOIUrl":"https://doi.org/10.1088/1361-6382/ade1c7","url":null,"abstract":"Space-based gravitational wave detectors, such as the Laser Interferometer Space Antenna, use picometer-precision laser interferometry to detect gravitational waves at frequencies from 1 Hz down to below 0.1 mHz. Laser interferometers used for on-ground prototyping and testing of such instruments are typically constructed by permanently bonding or gluing optics onto an ultra-stable bench made of low-expansion glass ceramic. This design minimises temperature coupling to length and tilt, which dominates the noise at low frequencies due to finite temperature stability achievable in laboratories and vacuum environments. Here, we present the study of an alternative opto-mechanical concept where optical components are placed with adjustable and freely positionable mounts on an ultra-stable bench, while maintaining picometer length stability. With this concept, a given interferometer configuration can be realised very quickly due to a simplified and speed-up assembly process, reducing the realisation time from weeks or months to a matter of hours. We built a corresponding test facility and verified the length stability of our concept by measuring the length change in an optical cavity that was probed with two different locking schemes, heterodyne laser frequency stabilisation and Pound–Drever–Hall locking. We studied the limitations of both locking schemes and verified that the cavity length noise is below 1 pm for frequencies down to 3 mHz. We thereby demonstrate that our concept can simplify the testing of interferometer configurations and opto-mechanical components and is suitable to realise flexible optical ground support equipment for space missions that use laser interferometry, such as future space-based gravitational wave detectors and satellite geodesy missions.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"25 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144371131","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