Classical and Quantum Gravity最新文献_第6页

On covariant and canonical Hamiltonian formalisms: weakly isolated horizons 关于协变和正则哈密顿形式：弱孤立视界

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-04 DOI: 10.1088/1361-6382/adff47

Alejandro Corichi, Juan D Reyes and Tatjana Vukašinac

{"title":"On covariant and canonical Hamiltonian formalisms: weakly isolated horizons","authors":"Alejandro Corichi, Juan D Reyes and Tatjana Vukašinac","doi":"10.1088/1361-6382/adff47","DOIUrl":"https://doi.org/10.1088/1361-6382/adff47","url":null,"abstract":"The Hamiltonian description of classical gauge theories is a well studied subject. The two best known approaches, namely the covariant and canonical Hamiltonian formalisms, have received a lot of attention in the literature. The relation between them has also been extensively analyzed. However, a complete understanding of this relation is still not available, specially for gauge theories that are defined over regions with boundaries. Here we consider this issue, for spacetimes with isolated horizons as inner boundaries (representing black holes in equilibrium), and assess whether their corresponding descriptions can be seen as equivalent. First, we review and reanalyze both formalisms from anew and show that, if we compare them at face value, there are differences between them, for instance in the derivation of horizon energy, a physical observable of the theory, as well as in the number of boundary degrees of freedom. Here we construct and compare possible extensions of the corresponding phase spaces, in a way that has not been explored before. We analyze different possible interpretations in both approaches and show how one can achieve correspondence between results within covariant and canonical formalisms. Along the way, we shed light on the role of boundary terms in the symplectic structure in relation to boundary degrees of freedom.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"22 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144995512","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

Gravitationally induced decoherence of a scalar field: investigating the one-particle sector and its interplay with renormalisation 标量场的引力诱导退相干：研究单粒子扇区及其与重整化的相互作用

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-03 DOI: 10.1088/1361-6382/adfb1d

Max Joseph Fahn and Kristina Giesel

{"title":"Gravitationally induced decoherence of a scalar field: investigating the one-particle sector and its interplay with renormalisation","authors":"Max Joseph Fahn and Kristina Giesel","doi":"10.1088/1361-6382/adfb1d","DOIUrl":"https://doi.org/10.1088/1361-6382/adfb1d","url":null,"abstract":"We investigate the one-particle sector for the field-theoretical model of gravitationally induced decoherence for a scalar field in Fahn et al (2023 Class. Quantum Grav.40 094002) with a special focus on the renormalisation of the one-particle master equation. In contrast to existing models in the literature, where the renormalisation is usually performed after the Markov and rotating wave approximation (RWA) and often only for certain limits such as the non- or ultra-relativistic limit, here we apply the renormalisation directly after the one-particle projection. With this strategy, we show that UV-divergent contributions in the one-particle master equation can be identified with the vacuum contributions in the self-energy of the scalar field in the effective quantum field theory and depending on the chosen one-particle projection method, its vacuum bubbles, while the additional thermal contributions in the self-energy are all UV-finite. To obtain the renormalised one-particle master equation, we use an on-shell renormalisation procedure of the underlying effective QFT. We then apply the Markov and RWA, specifying a condition under which the Markov approximation can be applied in the case of the ultra-relativistic limit. We compare our results with those available in the literature. This includes an analysis of two different kinds of one-particle projections, a comparison of the application and effects of renormalisation of quantum mechanical and field theoretical models, the non-relativistic and ultra-relativistic limits of the renormalised one-particle master equations, and a comparison with a quantum mechanical toy model for gravitationally induced decoherence in the context of neutrino oscillations.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"15 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144987341","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

Multipole measurements through gravitational waves of compact object binaries 通过紧致双星引力波的多极测量

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-03 DOI: 10.1088/1361-6382/adf935

Jiageng Jiao, Yuetong Zhao, Junjie Zhao and Zhoujian Cao

{"title":"Multipole measurements through gravitational waves of compact object binaries","authors":"Jiageng Jiao, Yuetong Zhao, Junjie Zhao and Zhoujian Cao","doi":"10.1088/1361-6382/adf935","DOIUrl":"https://doi.org/10.1088/1361-6382/adf935","url":null,"abstract":"The inaccessibility of a black hole’s internal structure, due to the one-way nature of the event horizon, remains a fundamental challenge in astrophysics. Nevertheless, gravitational interactions can bridge our understanding between the black hole’s internal structure and the external spacetime. Specifically, the spacetime structure is characterized by its multipole moments, which vary distinctly among different black holes. According to general relativity, black holes exhibit the no-hair property, uniquely defining their multipole moments. Gravitational waves (GWs) serve as carriers of this multipole-moment information from the spacetime of black holes. In this study, we analyze mock samples of binary black holes calibrated to the GWTC-3 catalog to investigate the measurement and associated degeneracies of their multipole moments using individual and joint observations from next-generation ground-based and space-based detectors. Our results show that measuring higher-order multipole moments, such as the octupole, remains challenging for individual detectors due to strong parameter degeneracies. However, multiband joint observations mitigate these degeneracies, improving the precision of multipole parameter estimation by approximately an order of magnitude. This advancement underscores the critical role of multiband gravitational-wave networks in probing black-hole spacetime properties and testing the no-hair theorem.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"33 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144987408","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

A cryogenic test-mass suspension with flexures operating in compression for third-generation gravitational-wave detectors 用于第三代引力波探测器的具有弯曲的低温测试质量悬架

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-02 DOI: 10.1088/1361-6382/adfd35

Fabián E Peña Arellano, Nelson L Leon, Leonardo González López, Riccardo DeSalvo, Harry Themann, Esra Zerina Appavuravther, Guerino Avallone, Francesca Badaracco, Mark A Barton, Alessandro Bertolini, Christian Chavez, Andy Damas, Richard Damas, Britney Gallego, Eric Hennes, Gerardo Iannone, Seth Linker, Marina Mondin, Claudia Moreno, Kevin Pang, Stefano Selleri, Mynor Soto, Flavio Travasso, Joris Van-Heijningen, Fernando Velez and Morgane Zeoli

{"title":"A cryogenic test-mass suspension with flexures operating in compression for third-generation gravitational-wave detectors","authors":"Fabián E Peña Arellano, Nelson L Leon, Leonardo González López, Riccardo DeSalvo, Harry Themann, Esra Zerina Appavuravther, Guerino Avallone, Francesca Badaracco, Mark A Barton, Alessandro Bertolini, Christian Chavez, Andy Damas, Richard Damas, Britney Gallego, Eric Hennes, Gerardo Iannone, Seth Linker, Marina Mondin, Claudia Moreno, Kevin Pang, Stefano Selleri, Mynor Soto, Flavio Travasso, Joris Van-Heijningen, Fernando Velez and Morgane Zeoli","doi":"10.1088/1361-6382/adfd35","DOIUrl":"https://doi.org/10.1088/1361-6382/adfd35","url":null,"abstract":"This paper presents an analysis of the conceptual design of a novel silicon suspension for the cryogenic test-mass mirrors of the low-frequency detector of the Einstein telescope gravitational-wave observatory. In traditional suspensions, tensional stress is a severe limitation for achieving low thermal noise, safer mechanical margins and high thermal conductance simultaneously. In order to keep the tensional stress sufficiently low, we propose the use of rigid beams with large cross sections, combined with short flexures under compressional load. This configuration takes advantage of the higher strength of silicon in compression with respect to its strength in tension. The flexures are mechanically robust and at the same time soft in the working direction, thus producing low suspension thermal noise and, by being short, provide high thermal conductance for cryogenic cooling. The rigid beams, located between the test mass and an intermediate mass, allow the elimination of the recoil mass used conventionally for applying control forces for interferometer lock, and the use of optical anti-springs to reduce the pendulum resonant frequency to further improve the vibration isolation of the test mass. The configuration has the capability to reach a lower mirror operational temperature, which is expected to produce a substantial reduction of the thermal noise in the mirrors of the interferometer.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"84 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144930341","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

Towards robust gravitational wave detections from individual supermassive black hole binaries 对单个超大质量黑洞双星的强大引力波探测

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-02 DOI: 10.1088/1361-6382/adfd36

Bence Bécsy, Neil J Cornish, Polina Petrov, Xavier Siemens, Stephen R Taylor, Sarah J Vigeland and Caitlin A Witt

{"title":"Towards robust gravitational wave detections from individual supermassive black hole binaries","authors":"Bence Bécsy, Neil J Cornish, Polina Petrov, Xavier Siemens, Stephen R Taylor, Sarah J Vigeland and Caitlin A Witt","doi":"10.1088/1361-6382/adfd36","DOIUrl":"https://doi.org/10.1088/1361-6382/adfd36","url":null,"abstract":"The recent discovery of the stochastic gravitational-wave background via pulsar timing arrays will likely be followed by the detection of individual black hole binaries that stand out above the background. However, to confidently claim the detection of an individual binary, we need not only more and better data, but also more sophisticated analysis techniques. In this paper, we develop two new approaches that can help us more robustly ascertain if a candidate found by a search algorithm is indeed an individual supermassive black hole binary. One of these is a coherence test that directly compares the full signal model to an incoherent version of that. The other is a model scrambling approach that builds null distributions of our detection statistic and compares that with the measured value to quantify our confidence in signal coherence. Both of these rely on finding the coherence between pulsars characteristic to gravitational waves (GWs) from a binary system. We test these methods on simple simulated datasets and find that they work well in correctly identifying both true GWs and false positives. However, as expected for such a flexible and simple signal model, confidently identifying signal coherence is significantly harder than simply finding a candidate in most scenarios. Our analyses also indicate that the confidence with which we can identify a true signal depends not only on the signal-to-noise ratio, but also on the number of contributing pulsars and the amount of frequency evolution shown by the signal.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"24 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144930342","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

Dynamic photothermal effects in different optical cavities 不同光腔中的动态光热效应

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-02 DOI: 10.1088/1361-6382/adfda6

Qiyue Wu, Jialu Chang, Zhiyuan Wang, Jingxuan Zhang, Qiang Wei, Xiaoxu Chen, Yanfang Yi, Zehuang Lu and Jie Zhang

{"title":"Dynamic photothermal effects in different optical cavities","authors":"Qiyue Wu, Jialu Chang, Zhiyuan Wang, Jingxuan Zhang, Qiang Wei, Xiaoxu Chen, Yanfang Yi, Zehuang Lu and Jie Zhang","doi":"10.1088/1361-6382/adfda6","DOIUrl":"https://doi.org/10.1088/1361-6382/adfda6","url":null,"abstract":"Ultra-stable lasers with excellent long-term stability are increasingly demanded in fields like gravitational wave detection and optical frequency standards. The dynamic photothermal effect, arising from local temperature fluctuations in cavity mirrors, is a significant limiting factor. We conduct precise measurements of the dynamic photothermal responses in various Fabry–Pérot cavities, and systematically investigate both the contributions from different materials and the characteristics of spacer photothermal noise. For ultra low expansion glass (ULE) cavities with fused silica mirror substrate and all-ULE cavities, thermoelastic noises from the substrate and coating contribute the most, respectively. In cryogenic sapphire cavities, spacer thermoelastic noise dominates and causes a more significant low frequency dynamic photothermal influence. A modulation experiment is conducted to verity the measured response coefficients. This work provides a general guidance for understanding the dynamic photothermal effect and aids in designing cavities with optimized sensitivity, advancing ultra-stable lasers with superior long-term frequency stability.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"31 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144930343","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

Characterisation of circular light rays in a plasma 等离子体中圆形光线的特性

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-02 DOI: 10.1088/1361-6382/adfeb1

Volker Perlick

引用次数: 0

Affine connections for Galilean and Carrollian structures: a unified perspective 伽利略和卡罗结构的仿射连接：一个统一的观点

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-02 DOI: 10.1088/1361-6382/adfc1e

Quentin Vigneron, Hamed Barzegar and James Read

引用次数: 0

Revisiting GW150914 with a non-planar, eccentric waveform model 用非平面偏心波形模型重访GW150914

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-02 DOI: 10.1088/1361-6382/adfe50

Rossella Gamba, Jacob Lange, Danilo Chiaramello, Jacopo Tissino and Snehal Tibrewal

{"title":"Revisiting GW150914 with a non-planar, eccentric waveform model","authors":"Rossella Gamba, Jacob Lange, Danilo Chiaramello, Jacopo Tissino and Snehal Tibrewal","doi":"10.1088/1361-6382/adfe50","DOIUrl":"https://doi.org/10.1088/1361-6382/adfe50","url":null,"abstract":"The first direct detection of gravitational waves by the LIGO collaboration, GW150914, marked the start of a new exciting era in astronomy, enabling the study of the Universe through a new messenger. Since then, the field has grown rapidly, with the development of increasingly more sophisticated techniques to detect, analyze and interpret the signals. In this paper we revisit GW150914, presenting updated estimates of its source parameters using a waveform model developed within the EOB formalism, able to describe gravitational-wave emission from generic non-circular, non-planar binaries. We provide a comprehensive analysis of the signal and its properties, considering and contrasting various scenarios for the source: from the simplest, aligned-spin quasi-circular (QC) binary black hole (BBH) merger, to more complex scenarios, including precession, eccentricity or both. Unsurprisingly, we find that the signal is consistent with a QC (e < 0.08 at 15 Hz), slowly spinning BBH merger, a-posteriori validating a considerable body of works. This is the first analysis performed with an inspiral-merger-ringdown model containing both eccentricity and precession.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"32 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144930344","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

Thermodynamics of effective loop quantum black holes 有效环量子黑洞的热力学

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-01 DOI: 10.1088/1361-6382/adf936

F G Menezes, H A Borges, I P R Baranov and S Carneiro

引用次数: 0