Classical and Quantum Gravity最新文献_第8页

Quantum gravity inspired nonlocal quantum dynamics preserving the classical limit 量子引力启发的非局部量子动力学保留经典极限

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-12 DOI: 10.1088/1361-6382/ad7774

Marzena Ciszak, Alessio Belenchia, Antonello Ortolan and Francesco Marino

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Geometry transition in spinfoams 旋转泡沫中的几何转换

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-11 DOI: 10.1088/1361-6382/ad6114

Marios Christodoulou, Fabio D’Ambrosio and Charalampos Theofilis

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Arm-locking frequency noise suppression for astrodynamical middle-frequency interferometric gravitational wave observatory 用于天体动力学中频干涉引力波观测台的臂锁频率噪声抑制装置

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-11 DOI: 10.1088/1361-6382/ad72c8

Jun Nian and Wei-Tou Ni

{"title":"Arm-locking frequency noise suppression for astrodynamical middle-frequency interferometric gravitational wave observatory","authors":"Jun Nian and Wei-Tou Ni","doi":"10.1088/1361-6382/ad72c8","DOIUrl":"https://doi.org/10.1088/1361-6382/ad72c8","url":null,"abstract":"For space gravitational wave detection, arm locking is a proposal useful in decreasing the frequency noise of the laser sources for current developing space missions Laser Interferometer Space Antenna (LISA) and Taiji/TianQin. In this paper, we study the application of arm locking to the Astrodynamical Middle-frequency Interferometric Gravitational wave Observatory (AMIGO) to decrease the frequency noise of laser sources. For AMIGO, the arm-locking technique can suppress the laser frequency noise by three orders of magnitude. The advantage of this is to make the auxiliary noise assignment for AMIGO easier and more relaxed. For the first-generation time-delay interferometry (TDI) configuration, the laser frequency noise contribution is already below the core noise contribution. For the simple Michelson TDI configuration (X0), the arm locking makes the acceleration-thrust scheme, the delay-line scheme, or the combined scheme easier to implement. Within a relatively short period of less than a day (compared to less than twenty days for LISA/Taiji), the Doppler frequency pulling can be efficiently reduced to within ±0.001 Hz and does not affect the mission duty cycle much.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170861","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

Characteristic time scales for the geometry transition of a black hole to a white hole from spinfoams 从自旋泡沫看黑洞到白洞几何转换的特征时间尺度

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-11 DOI: 10.1088/1361-6382/ad6059

Marios Christodoulou and Fabio D’Ambrosio

{"title":"Characteristic time scales for the geometry transition of a black hole to a white hole from spinfoams","authors":"Marios Christodoulou and Fabio D’Ambrosio","doi":"10.1088/1361-6382/ad6059","DOIUrl":"https://doi.org/10.1088/1361-6382/ad6059","url":null,"abstract":"Quantum fluctuations of the metric may provide a decay mechanism for black holes through a transition to a white hole geometry. Previous studies formulated Loop Quantum Gravity amplitudes with a view to describe this process. We identify two timescales to be extracted which we call the crossing time and the lifetime and complete a calculation that gives explicit estimates using the asymptotics of the EPRL model. The crossing time is found to scale linearly in the mass, in agreement with previous results by Ambrus and Hájíček and more recent results by Barceló, Carballo–Rubio and Garay. The lifetime is found to depend instead on the spread of the quantum state, and thus its dependence on the mass can take a large range of values. This indicates that the truncation/approximation used here is not appropriate to estimate this observable with any certainty. The simplest choice of a balanced semiclassical state is shown to yield an exponential scaling of the lifetime in the mass squared. Our analysis only considers 2-complexes without bulk faces, a significant limitation. In particular it is not clear how our estimates will be affected under refinements. This work should be understood as a step towards a fuller calculation in the context of covariant Loop Quantum Gravity.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170860","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

Quantum strong cosmic censorship and black hole evaporation 量子强宇宙审查和黑洞蒸发

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-11 DOI: 10.1088/1361-6382/ad756c

Benito A Juárez-Aubry

引用次数: 0

Photon traps in nonlinear electrodynamics 非线性电动力学中的光子陷阱

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-11 DOI: 10.1088/1361-6382/ad756b

Érico Goulart and Eduardo Bittencourt

引用次数: 0

Study on temperature noise suppression characteristics of passive thermal control materials in gravitational wave detection 引力波探测中被动热控材料的温度噪声抑制特性研究

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-10 DOI: 10.1088/1361-6382/ad75de

Hua Chen, Jia-He Kang, Rui Zhao, Chang-Peng Yang, Xin Zhao and Wen-Long Cheng

{"title":"Study on temperature noise suppression characteristics of passive thermal control materials in gravitational wave detection","authors":"Hua Chen, Jia-He Kang, Rui Zhao, Chang-Peng Yang, Xin Zhao and Wen-Long Cheng","doi":"10.1088/1361-6382/ad75de","DOIUrl":"https://doi.org/10.1088/1361-6382/ad75de","url":null,"abstract":"Space-borne gravitational wave (GW) detector requires high detection sensitivity in millihertz band. Temperature noise characterized by temperature amplitude spectral density (TASD) in target frequency band (0.1 mHz–100 mHz) must be limited to μK Hz−1/2 level. However, TASD at ultra-low frequency ascends sharply, leading to temperature noise suppression failure of passive thermal control material (PTM). In this paper, we proposed ‘frequency barrier’ to denote the sharply TASD transition at ultra-low frequency and developed temperature noise transmission model to study the effect of heat flow spectral characteristics and PTM thermophysical properties on TASD and frequency barrier. The results showed that reducing PTM thermal conductivity could decrease TASD apparently at certain heat flow frequency, but minimum TASD limit exist which increases with decreasing heat flow frequency. Frequency barrier decreases with decreasing thermal conductivity and increasing specific heat capacity of PTM. High heat capacity materials accumulate more heat, while low thermal conductivity materials attenuate more temperature fluctuations, enabling effective temperature noise suppression at low heat flow frequency and broadening PTM’s temperature noise suppression range. The obtained frequency barrier correlation provides guidance for the material selection criterion of temperature noise suppression in space-borne GW detection.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142166097","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

Iterative extraction of overtones from black hole ringdown 从黑洞环降中迭代提取泛音

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-09 DOI: 10.1088/1361-6382/ad72c9

Kazuto Takahashi and Hayato Motohashi

引用次数: 0

Kinetic and hydrodynamic post-Newtonian equations in the Brans–Dicke theory 布兰斯-迪克理论中的动力学和流体力学后牛顿方程

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-09 DOI: 10.1088/1361-6382/ad74d3

Gilberto M Kremer

引用次数: 0

Demonstration of machine learning-assisted low-latency noise regression in gravitational wave detectors 引力波探测器中机器学习辅助低延迟噪声回归演示

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-09 DOI: 10.1088/1361-6382/ad708a

Muhammed Saleem, Alec Gunny, Chia-Jui Chou, Li-Cheng Yang, Shu-Wei Yeh, Andy H Y Chen, Ryan Magee, William Benoit, Tri Nguyen, Pinchen Fan, Deep Chatterjee, Ethan Marx, Eric Moreno, Rafia Omer, Ryan Raikman, Dylan Rankin, Ritwik Sharma, Michael Coughlin, Philip Harris and Erik Katsavounidis

{"title":"Demonstration of machine learning-assisted low-latency noise regression in gravitational wave detectors","authors":"Muhammed Saleem, Alec Gunny, Chia-Jui Chou, Li-Cheng Yang, Shu-Wei Yeh, Andy H Y Chen, Ryan Magee, William Benoit, Tri Nguyen, Pinchen Fan, Deep Chatterjee, Ethan Marx, Eric Moreno, Rafia Omer, Ryan Raikman, Dylan Rankin, Ritwik Sharma, Michael Coughlin, Philip Harris and Erik Katsavounidis","doi":"10.1088/1361-6382/ad708a","DOIUrl":"https://doi.org/10.1088/1361-6382/ad708a","url":null,"abstract":"Low-latency noise regression algorithms are crucial for maximizing the science outcomes of the LIGO, Virgo, and KAGRA gravitational-wave detectors. This includes improvements in the detectability, source localization and pre-merger detectability of signals thereby enabling rapid multi-messenger follow-up. In this paper, we demonstrate the effectiveness of DeepClean, a convolutional neural network architecture that uses witness sensors to estimate and subtract non-linear and non-stationary noise from gravitational-wave strain data. Our study uses LIGO data from the third observing run with injected compact binary signals. As a demonstration, we use DeepClean to subtract the noise at 60 Hz due to the power mains and their sidebands arising from non-linear coupling with other instrumental noise sources. Our parameter estimation study on the injected signals shows that DeepClean does not do any harm to the underlying astrophysical signals in the data while it can enhance the signal-to-noise ratio of potential signals. We show that DeepClean can be used for low-latency noise regression to produce cleaned output data at latencies ~1–2 s. We also discuss various considerations that may be made while training DeepClean for low latency applications.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160700","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