Classical and Quantum Gravity最新文献_第2页

Accelerated inference of binary black-hole populations from the stochastic gravitational-wave background 从随机引力波背景加速推断双黑洞种群

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-29 DOI: 10.1088/1361-6382/ae07a0

Giovanni Giarda, Arianna I Renzini, Costantino Pacilio and Davide Gerosa

{"title":"Accelerated inference of binary black-hole populations from the stochastic gravitational-wave background","authors":"Giovanni Giarda, Arianna I Renzini, Costantino Pacilio and Davide Gerosa","doi":"10.1088/1361-6382/ae07a0","DOIUrl":"https://doi.org/10.1088/1361-6382/ae07a0","url":null,"abstract":"Third-generation ground-based gravitational wave detectors are expected to observe of overlapping signals per year from a multitude of astrophysical sources that will be computationally challenging to resolve individually. On the other hand, the stochastic background resulting from the entire population of sources encodes information about the underlying population, allowing for population parameter inference independent and complementary to that obtained with individually resolved events. Parameter estimation in this case is still computationally challenging, as computing the power spectrum involves sampling sources for each set of hyperparameters describing the binary population. In this work, we build on recently developed importance sampling techniques to compute the stochastic gravitational-wave background (SGWB) efficiently and train neural networks to interpolate the resulting background. We show that a multi-layer perceptron can encode the model information, allowing for significantly faster inference. We test the network assuming an observing setup with CE and ET sensitivities, where for the first time we include the intrinsic variance of the SGWB in the inference, as in this setup it presents a dominant source of measurement noise.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"4 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145188509","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

Integration of high-performance compact interferometric sensors in a suspended interferometer 在悬置干涉仪中集成高性能紧凑型干涉传感器

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-29 DOI: 10.1088/1361-6382/ae0087

A Mitchell, J Lehmann, P Koch, S J Cooper, J van Dongen, L Prokhorov, N A Holland, M Valentini, P Saffarieh and C M Mow-Lowry

{"title":"Integration of high-performance compact interferometric sensors in a suspended interferometer","authors":"A Mitchell, J Lehmann, P Koch, S J Cooper, J van Dongen, L Prokhorov, N A Holland, M Valentini, P Saffarieh and C M Mow-Lowry","doi":"10.1088/1361-6382/ae0087","DOIUrl":"https://doi.org/10.1088/1361-6382/ae0087","url":null,"abstract":"Homodyne quadrature interferometers (HoQIs) are compact, low noise and high dynamic range displacement sensors designed for use in gravitational wave observatories. Their lower noise compared to the displacement sensors used at present makes them valuable for improving the seismic isolation in current and future detectors. This paper outlines the progression of this sensor from initial production and benchtop tests to in-vacuum static performance and installation in a gravitational wave detector prototype facility. A detailed design description is outlined, including the full signal and optical chain required for implementation in detectors. The measured in-vacuum static performance indicates a noise floor of 3– at 10 Hz. Three HoQIs were installed on the beamsplitter suspension at the Albert Einstein Institute 10 m gravitational wave detector prototype. They measured motion of the intermediate mass across the entire bandwidth measured and showed minimal non-linearities and a good robustness to motion in unmeasured degrees of freedom, both important for practical use in dynamic systems such as seismic isolation.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"31 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145188508","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

Defining eccentricity for spin-precessing binaries 定义自旋处理双星的离心率

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-28 DOI: 10.1088/1361-6382/ae085d

Md Arif Shaikh, Vijay Varma, Antoni Ramos-Buades, Harald P Pfeiffer, Michael Boyle, Lawrence E Kidder and Mark A Scheel

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Negligible MOND effects on the orbits of planets MOND对行星轨道的影响可以忽略不计

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-28 DOI: 10.1088/1361-6382/ae085b

Youngsub Yoon

{"title":"Negligible MOND effects on the orbits of planets","authors":"Youngsub Yoon","doi":"10.1088/1361-6382/ae085b","DOIUrl":"https://doi.org/10.1088/1361-6382/ae085b","url":null,"abstract":"First proposed in 1983, modified newtonian dynamics (MOND) provides an alternative picture to dark matter theory. However, recently, there have been several reports that MOND is inconsistent with, or at least difficult to reconcile with, the orbits of planets in the Solar System. As with all the other studies so far, they assumed that the planetary accelerations can be computed without considering their own gravity (i.e. their self-gravity). Nonetheless, we demonstrate that, according to the original MOND theory, instead of its variants, each planet essentially follows a Newtonian orbit when its self-gravity is taken into account; the relative increase in gravitational acceleration due to MOND is at most 3 × 10−11 for Mercury, which has the highest relative increase among planets, while the value has a relative error of approximately 6 10−11, rendering the deviation from the Newtonian orbit undetectable with today’s technology. It is in stark contrast to the two major variants of MOND, namely AQUAL and MOND, where it has been proven that self-gravity can be ignored in a suitable limit when determining the MOND acceleration, which significantly deviates from the Newtonian acceleration. Consequently, attempting to constrain or falsify MOND through the analysis of planetary orbits becomes largely meaningless if the original MOND theory, rather than AQUAL or QUMOND, is valid. As a result, it is unjustified to argue that MOND is incorrect due to the observed lack of its influence on the orbits of planets, unless one of the variants of MOND theory, instead of the original one, is correct.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"4 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145182795","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

Carrollian R ... 卡罗里安·R……

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-25 DOI: 10.1088/1361-6382/ae077a

Andrew James Bruce

引用次数: 0

Frequency-multiplexed decoupled multi-degree-of-freedom capacitive sensing for gravitational reference system: design and experimental validation 重力参照系多频解耦多自由度电容传感：设计与实验验证

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-25 DOI: 10.1088/1361-6382/ae085c

Qingqing Yang, Yanzheng Bai, Ming Hu, Wei Hong, Chaoli Ouyang, Shaobo Qu, Chengrui Wang, Jianbo Yu, Wendong Yu and Zebing Zhou

{"title":"Frequency-multiplexed decoupled multi-degree-of-freedom capacitive sensing for gravitational reference system: design and experimental validation","authors":"Qingqing Yang, Yanzheng Bai, Ming Hu, Wei Hong, Chaoli Ouyang, Shaobo Qu, Chengrui Wang, Jianbo Yu, Wendong Yu and Zebing Zhou","doi":"10.1088/1361-6382/ae085c","DOIUrl":"https://doi.org/10.1088/1361-6382/ae085c","url":null,"abstract":"The multiple degree-of-freedom (DOF) capacitive sensing circuits are among the most critical technologies for the gravitational reference system (GRS) in space-based gravitational wave detection missions. The GRS baseline design in the laser interferometer space antenna pathfinder (LPF) satellite requires independent injection electrodes to apply a common high-frequency carrier signal to amplitude modulate the attitude signals of the test mass (TM), which complicates the electrode distribution and results in low injection efficiency of the carrier signal. In this paper, we present a multi-DOF capacitive sensing circuit architecture that eliminates the need for additional injection electrodes by employing multi-frequency carrier injection and split-frequency modulation for each DOF displacement signal detection. We present a comprehensive analysis of the proposed scheme, including its fundamental principle, cross-channel injection coupling effect, and noise performance. A proof-of-principle experiment demonstrates the feasibility of the design, and the validation results show that the sensing resolution of each channel can still reach 10−7 pF (Hz1/2)−1. The measured cross-channel coupling between the two-DOF channels is less than 0.32% when the TM is in the ±1.0 pF motion range. While imposing stricter requirements on transformer performance and elevating the design complexity of higher-order bandpass filters, the proposed scheme provides a way to simplify the electrode configuration by using the same electrodes to achieve the injection-sensing-feedback function differing from the LPF baseline design, which could also improve the injection efficiency and optimize the GRS performance.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"94 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141568","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

Correspondence between 3BF and Einstein–Cartan formulations of quantum gravity 3BF与爱因斯坦-卡坦量子引力公式的对应关系

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-24 DOI: 10.1088/1361-6382/ae06e9

Pavle Stipsić and Marko Vojinović

引用次数: 0

S-algebra in gauge theory: twistor, spacetime and holographic perspectives 规范理论中的s代数：扭曲、时空和全息透视

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-23 DOI: 10.1088/1361-6382/ae0673

Adam Kmec, Lionel Mason, Romain Ruzziconi and Atul Sharma

{"title":"S-algebra in gauge theory: twistor, spacetime and holographic perspectives","authors":"Adam Kmec, Lionel Mason, Romain Ruzziconi and Atul Sharma","doi":"10.1088/1361-6382/ae0673","DOIUrl":"https://doi.org/10.1088/1361-6382/ae0673","url":null,"abstract":"The celestial S-algebra arose from a reinterpretation of collinear limits of the Yang–Mills S-matrix as OPEs in celestial holography. It was subsequently represented via asymptotic charge aspects defined in the Yang–Mills radiative phase space defined at null infinity on the one hand, and via a twisted holography vertex algebra construction in twistor space on the other. Here we first identify it with the traditional symmetry algebra of self-dual Yang–Mills theory as an integrable system via its hierarchies of conserved quantities and associated flows; the self-dual phase space can be canonically identified with that of full Yang–Mills at null infinity . We derive the associated canonical generators from the twistor space action, identifying two infinite towers of charges corresponding to the two gluon helicities. These expressions are translated into spacetime data at null infinity using twistor integral formulae. Examining the charge algebra at spacelike infinity reveals the vertex algebras studied in the context of twisted holography. Our discussion extends directly to the celestial symmetries of self-dual gravity. This analysis provides a unified framework for celestial symmetries, connecting twistor, spacetime, and holographic approaches and culminating in a nonlinear extrapolate dictionary for self-dual gauge theory.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"10 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145127543","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

Canonical gravity in degenerate limit 简并极限中的正则重力

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-23 DOI: 10.1088/1361-6382/ae06ea

Sandipan Sengupta

引用次数: 0

Can an extra degree of freedom in scalar-tensor non-metricity gravity account for the evolution of the Universe? 标量张量非度规引力的额外自由度能否解释宇宙的演化？

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-22 DOI: 10.1088/1361-6382/ae0404

Ghulam Murtaza, Avik De, Andronikos Paliathanasis and Tee-How Loo

{"title":"Can an extra degree of freedom in scalar-tensor non-metricity gravity account for the evolution of the Universe?","authors":"Ghulam Murtaza, Avik De, Andronikos Paliathanasis and Tee-How Loo","doi":"10.1088/1361-6382/ae0404","DOIUrl":"https://doi.org/10.1088/1361-6382/ae0404","url":null,"abstract":"We investigate whether the extra scalar degree of freedom that arises in the second connection class of scalar-tensor non-metricity gravity can accurately replicate and potentially enrich the cosmic expansion history. Focusing on a spatially flat Friedmann–Lemaître–Robertson–Walker background, we introduce Hubble-normalized variables and recast the field equations into an autonomous dynamical system. Four representative scenarios are analyzed comprehensively. Phase-space research reveals a rich hierarchy of critical points: matter-dominated, stiff-fluid, and de Sitter solutions, together with asymptotic trajectories leading to Big-Crunch/Rip singularities and transient, unstable matter epochs. With suitable parameter choices, the standard ΛCDM sequence is reinstated; however, novel late-time and high-curvature regimes arise exclusively from the non-metricity sector. A systematic comparison of metric scalar-tensor and teleparallel scalar-torsion theories reveals unique stability characteristics and potential observational discriminants. Our findings indicate that the additional time-dependent function inherent to scalar-tensor non-metricity gravity can effectively explain the Universe’s evolution while providing new phenomenology that can be tested by upcoming surveys.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"35 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145116361","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