Classical and Quantum Gravity最新文献_第9页

On the integrability of extended test body dynamics around black holes 关于黑洞周围扩展试验体动力学的可积性

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-06 DOI: 10.1088/1361-6382/adb197

Paul Ramond

{"title":"On the integrability of extended test body dynamics around black holes","authors":"Paul Ramond","doi":"10.1088/1361-6382/adb197","DOIUrl":"https://doi.org/10.1088/1361-6382/adb197","url":null,"abstract":"In general relativity, the motion of an extended test body is influenced by its proper rotation, or spin. We present a covariant and physically self-consistent Hamiltonian framework to study this motion, up to quadratic order in the body’s spin, including a spin-induced quadrupole, and in an arbitrary background spacetime. The choice of spin supplementary condition and degeneracies associated with local Lorentz invariance are treated rigorously with adapted tools from Hamiltonian mechanics. Applying the formalism to a background space-time described by the Kerr metric, we prove that the motion of any test compact object around a rotating black hole defines an integrable Hamiltonian system to linear order in the body’s spin. Moreover, this integrability still holds at quadratic order in spin when the compact object has the deformability expected for an isolated black hole. By exploiting the unique symmetries at play in black hole binaries, our analytical results clarify longstanding numerical conjectures regarding spin-induced chaos in the motion of asymmetric compact binaries, and may provide a powerful framework to improve current gravitational waveform modelling.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"3 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143561274","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

Extracting gravitational wave signals from LISA data in the presence of artifacts 从存在伪影的LISA数据中提取引力波信号

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-06 DOI: 10.1088/1361-6382/adb931

Eleonora Castelli, Quentin Baghi, John G Baker, Jacob Slutsky, Jérôme Bobin, Nikolaos Karnesis, Antoine Petiteau, Orion Sauter, Peter Wass and William J Weber

{"title":"Extracting gravitational wave signals from LISA data in the presence of artifacts","authors":"Eleonora Castelli, Quentin Baghi, John G Baker, Jacob Slutsky, Jérôme Bobin, Nikolaos Karnesis, Antoine Petiteau, Orion Sauter, Peter Wass and William J Weber","doi":"10.1088/1361-6382/adb931","DOIUrl":"https://doi.org/10.1088/1361-6382/adb931","url":null,"abstract":"The Laser Interferometer Space Antenna (LISA) mission is being developed by ESA with NASA participation. As it has recently passed the Mission Adoption milestone, models of the instruments and noise performance are becoming more detailed, and likewise prototype data analyses must as well. Assumptions such as Gaussianity, stationarity, and data continuity are unrealistic, and must be replaced with physically motivated data simulations, and data analysis methods adapted to accommodate such likely imperfections. To this end, the LISA Data Challenges have produced datasets featuring time-varying and unequal constellation armlength, and measurement artifacts including data interruptions and instrumental transients. In this work, we assess the impact of these data artifacts on the inference of galactic binary and massive black hole properties. Our analysis shows that the treatment of noise transients and gaps is necessary for effective parameter estimation, as they substantially corrupt the analysis if unmitigated. We find that straightforward mitigation techniques can significantly if imperfectly suppress artifacts. For the Galactic Binaries, mitigation of glitches was essentially total, while mitigations of the data gaps increased parameter uncertainty by approximately 10%. For the massive black hole binaries the particularly pernicious glitches resulted in a 30% uncertainty increase after mitigations, while the data gaps can increase parameter uncertainty by up to several times. Critically, this underlines the importance of early detection of transient gravitational waves to ensure they are protected from planned data interruptions.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"36 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560618","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

Fractional entropy of the Brown–Kuchař dust in fractional anti-de Sitter quantum gravity 分数阶反德西特量子引力中布朗-库恰夫尘的分数熵

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-06 DOI: 10.1088/1361-6382/adb899

P F da Silva Júnior, S Jalalzadeh and H Moradpour

引用次数: 0

Black holes in the expanding Universe 膨胀宇宙中的黑洞

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-05 DOI: 10.1088/1361-6382/adb537

Nikodem Popławski

引用次数: 0

Gravitational radiation reaction for compact binary systems at the fourth-and-a-half post-Newtonian order 四阶半后牛顿阶紧致双星系统的引力辐射反应

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-04 DOI: 10.1088/1361-6382/adac9d

Luc Blanchet, Guillaume Faye and David Trestini

{"title":"Gravitational radiation reaction for compact binary systems at the fourth-and-a-half post-Newtonian order","authors":"Luc Blanchet, Guillaume Faye and David Trestini","doi":"10.1088/1361-6382/adac9d","DOIUrl":"https://doi.org/10.1088/1361-6382/adac9d","url":null,"abstract":"We compute the gravitational radiation–reaction (RR) force on a compact binary source at the fourth-and-a-half post-Newtonian (4.5PN) order of general relativity, i.e. 2PN order beyond the leading 2.5PN radiation reaction. The calculation is valid for general orbits in a general frame, but in a particular coordinate system which is an extension of the Burke–Thorne coordinate system at the lowest order. With the RR acceleration, we derive (from first principles) the flux-balance laws associated with the energy, the angular and linear momenta, and the center-of-mass (CM) position, in a general frame and up to 4.5PN order. Restricting our attention to the frame of the center of mass, we point out that the equations of motion (EOM) acquire a non-local-in-time contribution at the 4.5PN order, made of the integrated flux of linear momentum (responsible for the recoil of the source) together with the instantaneous flux of CM position. The non-local contribution was overlooked in the past literature, which assumed locality of the RR force in the center of mass frame at 4.5PN order. We discuss the consequences of this non-local effect and obtain consistent non-local EOM and flux balance laws at 4.5PN order in the CM frame.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"9 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538331","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

Accuracy and stability study of two-way time transfer in Cis-lunar space 顺月空间双向时间传递精度与稳定性研究

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-04 DOI: 10.1088/1361-6382/adb7b3

Tong Liu, Cheng-Gang Qin, Jing-Hui Pu, Yong-Zhang Yang and Wen-Bin Wang

{"title":"Accuracy and stability study of two-way time transfer in Cis-lunar space","authors":"Tong Liu, Cheng-Gang Qin, Jing-Hui Pu, Yong-Zhang Yang and Wen-Bin Wang","doi":"10.1088/1361-6382/adb7b3","DOIUrl":"https://doi.org/10.1088/1361-6382/adb7b3","url":null,"abstract":"The realization of clock synchronization and syntonization via inter-satellite link is of vital importance for navigation, space-based Very Long Baseline Interferometry (VLBI) experiments and precision tests of fundamental physics. We study the accuracy and stability of time and frequency transfer via inter-satellite link in Cis-lunar space. A relativistic time transfer model using microwave dual one-way ranging (DOWR) is developed. Taking the distant retrograde orbit (DRO)-low Earth orbit (LEO) inter-satellite link as an instance, sub-nanoseconds level accuracy is achieved. We analyze the error in orbit determination of LEO satellite and DRO satellite. With the models of relative velocity correction, relativistic frequency shift and Shapiro delay, the stability of time transfer is studied. The result shows the DOWR microwave link would support clock synchronization with a time stability of better than 14.3 ps over 1000 s, better than 100.5 ps over one day, with the accuracy constraints on the orbit determination of the LEO satellite 10 cm and DRO satellite 50 m in position. If the longer time stability of hardware delay reaches ps level, the performance of DOWR time transfer link can be further improved to support the distribution of the time–frequency scale established by an active hydrogen maser with a frequency stability of over one day. We estimated that high-performance DRO-LEO time and frequency comparisons may support the gravitational redshift tests at a 10−6 level and the space-based VLBI experiments to improve the orbit determination of deep-space probes by one to two orders of magnitude.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"2 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538459","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

Effect of gravitational waves on Yang-Mills condensates 引力波对杨-米尔斯凝聚体的影响

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-03 DOI: 10.1088/1361-6382/adb5ea

Narasimha Reddy Gosala and Arundhati Dasgupta

引用次数: 0

Resonant behavior and stability of a linear three-mirror cavity 线性三镜腔的谐振特性和稳定性

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-03 DOI: 10.1088/1361-6382/adb827

Paul Stevens, Vincent Loriette, Manuel Andia, François Glotin, Angélique Lartaux-Vollard, Nicolas Leroy and Aymeric van de Walle

{"title":"Resonant behavior and stability of a linear three-mirror cavity","authors":"Paul Stevens, Vincent Loriette, Manuel Andia, François Glotin, Angélique Lartaux-Vollard, Nicolas Leroy and Aymeric van de Walle","doi":"10.1088/1361-6382/adb827","DOIUrl":"https://doi.org/10.1088/1361-6382/adb827","url":null,"abstract":"The implementation of Fabry–Perot cavities in gravitational-wave detectors has been pivotal to improving their sensitivity, allowing the observation of an increasing number of cosmological events with higher signal-to-noise ratio. Notably, Fabry–Perot cavities play a key role in the frequency-dependent squeezing technique, which provides a reduction of quantum noise over the whole observation frequency spectrum. In this paper, we first present how the adaptability of resonance properties of linear three-mirror cavities, and the real-time control we could have on it, would be interesting for frequency-dependant squeezing in future detectors, especially for Einstein Telescope project. In this view, we develop a complete model to describe the stability behavior and the properties of transmitted and reflected fields of a linear three-mirror cavity aiming to be used for design purposes. In particular, simulations are carried out to show the evolution of the characteristic double resonance peak they can show-off, which is one of the key features of this system, as a function of cavity parameters. We show that the double-peak shape is almost freely adjustable, either in terms of spacing between maxima, their relative amplitude and intrinsic width. This is made possible by changing the mirrors’ reflectivity coefficients and the sub-cavities microscopic/macroscopic lengths. However, the amount of achievable realistic configurations is limited by the stability conditions of the cavity. In particular, if the two sub-cavities do not have the same macroscopic length, it could be difficult to obtain a stable three-mirror cavity. Different geometries have been studied to obtain a stable system.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"55 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143532861","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

Kerr metric from two commuting complex structures 两个可交换复结构的克尔度规

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-03 DOI: 10.1088/1361-6382/adb531

Kirill Krasnov and Adam Shaw

引用次数: 0

The gauge theory of Weyl group and its interpretation as Weyl quadratic gravity Weyl群的规范理论及其作为Weyl二次引力的解释

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-02-28 DOI: 10.1088/1361-6382/adb3e8

Cezar Condeescu and Andrei Micu

引用次数: 0