Classical and Quantum Gravity最新文献

The impact of an antisymmetric tensor on charged black holes: evaporation process, geodesics, deflection angle, scattering effects and quasinormal modes

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-12 DOI: 10.1088/1361-6382/adbb4f

A A Araújo Filho, N Heidari, J A A S Reis and H Hassanabadi

引用次数: 0

Cosmic inflation prevents singularity formation in collapse into a Hayward black hole

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-12 DOI: 10.1088/1361-6382/adbc40

Michał Bobula

引用次数: 0

Fighting Newtonian noise with gradient-based optimization at the Einstein Telescope

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-11 DOI: 10.1088/1361-6382/adb898

Patrick Schillings and Johannes Erdmann

{"title":"Fighting Newtonian noise with gradient-based optimization at the Einstein Telescope","authors":"Patrick Schillings and Johannes Erdmann","doi":"10.1088/1361-6382/adb898","DOIUrl":"https://doi.org/10.1088/1361-6382/adb898","url":null,"abstract":"Newtonian noise in gravitational wave detectors originates from density fluctuations in the vicinity of the interferometer mirrors. At the Einstein Telescope, this noise source is expected to be dominant for low frequencies. Its impact is proposed to be reduced with the help of an array of seismometers that will be placed around the interferometer endpoints. We reformulate and implement the problem of finding the optimal seismometer positions in a differentiable way. We then explore the use of first-order gradient-based optimization for the design of the seismometer array for 1 Hz and 10 Hz and compare its performance and computational cost to two metaheuristic algorithms. For 1 Hz, we introduce a constraint term to prevent unphysical optimization results in the gradient-based method. In general, we find that it is an efficient strategy to initialize the gradient-based optimizer with a fast metaheuristic algorithm. For a small number of seismometers, this strategy results in approximately the same noise reduction as with the metaheuristics. For larger numbers of seismometers, gradient-based optimization outperforms the two metaheuristics by a factor of 2.25 for the faster of the two and a factor of 1.4 for the other one, which is significantly outperformed by gradient-based optimization in terms of computational efficiency.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"38 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143589903","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

Spurious solar-wind effects on acceleration noise in LISA Pathfinder

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-10 DOI: 10.1088/1361-6382/adb538

Arnold Tianyi Yang, Indie Desiderio-Sloane and Grant David Meadors

{"title":"Spurious solar-wind effects on acceleration noise in LISA Pathfinder","authors":"Arnold Tianyi Yang, Indie Desiderio-Sloane and Grant David Meadors","doi":"10.1088/1361-6382/adb538","DOIUrl":"https://doi.org/10.1088/1361-6382/adb538","url":null,"abstract":"Spurious solar-wind effects are a potential noise source in future Laser Interferometer Space Antenna (LISA) measurements. One noise coupling mechanism is constrained by estimating solar-wind effects on acceleration noise in LISA Pathfinder (LPF). While LISA is designed for drag-free differential measurement, predicting the realistic impact both bounds the operational environment and assesses whether LISA could provide serendipitous space-weather observations. Data from NASA’s Advanced Composition Explorer (ACE), situated at the L1 Lagrange point, serves as a reliable source of solar-wind data. The data sets are compared over the 114 d time period from 1 March 2016 to 23 June 2016. This period gives the longest readily-available open data set, without interference from other commissioning activities. To evaluate space weather effects, the data from both satellites are formatted, gap-filled/interpolated, and fast-Fourier transformed for amplitude spectral density and coherence comparisons. Solar wind effects are not seen in a coherence plot between LPF and ACE; modest coherence in the planned LISA observational frequency band can be attributed to chance. This result indicates that measurable correlation due to solar-wind acceleration noise over 3 month timescales will be a negligible noise source. LISA is unlikely to inform solar wind measurements routinely. Another source of noise from the Sun, solar radiation pressure, is estimated to impart greater acceleration noise, but has yet to be analyzed.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"2 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143582684","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

Local coordinates and motion of a test particle in the McVittie spacetime

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-07 DOI: 10.1088/1361-6382/adb7b4

Vishal Jayswal and Sergei M Kopeikin

引用次数: 0

Geometric inequality for axisymmetric black holes with angular momentum

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-03-07 DOI: 10.1088/1361-6382/adb82a

Xuefeng Feng, Ruodi Yan, Sijie Gao, Yun-Kau Lau and Shing-Tung Yau

引用次数: 0

Negative radiation pressure scheme for simultaneous suppression of arduous back-action evasion and shot noise in gravitational wave detectors

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/adba37

Souvik Agasti, Abhishek Shukla and Milos Nesladek

{"title":"Negative radiation pressure scheme for simultaneous suppression of arduous back-action evasion and shot noise in gravitational wave detectors","authors":"Souvik Agasti, Abhishek Shukla and Milos Nesladek","doi":"10.1088/1361-6382/adba37","DOIUrl":"https://doi.org/10.1088/1361-6382/adba37","url":null,"abstract":"Aiming at applications for gravitational wave (GW) detection, in particular at the reduction of quantum back action noise, we propose a novel scheme how to obtain back action evading measurements performed on an opto-mechanical cavity, by introducing a negative radiation pressure coupling between the cavity field and the end mirror. The scheme consists of introducing a double cavity with end mirrors interlocked by a pivot and moving in opposite directions. The measurement is performed by sending a two-mode squeezed vacuum to both cavities and detecting the output through the heterodyne detection. Compared to the previously proposed hybrid negative mass spin-optomechanical system in Khalili and Polzik (2018 Phys. Rev. Lett.121 031101), we see that our scheme is capable to suppress back action noise by nearly two orders of magnitude more in the lower frequency region. Overall, the setup has been able to squeeze the output noise below the standard quantum limit, with more efficiency. The scheme has also proven to be beneficial for reducing thermal noise by a significant amount. We confirm our result by a numerical analysis and compared it with the previous proposals (Khalili and Polzik 2018 Phys. Rev. Lett.121 031101).","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"33 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560619","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 the integrability of extended test body dynamics around black holes

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

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

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