Classical and Quantum Gravity最新文献_第5页

κ-general-relativity I: a non-commutative GR theory with the κ-Minkowski spacetime as its flat limit 广义相对论I：以广义-闵可夫斯基时空为平面极限的非交换广义相对论

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-10 DOI: 10.1088/1361-6382/adffdf

Daniel Rozental and Ofek Birnholtz

引用次数: 0

Associativity is enough: an all-orders 2d chiral algebra for 4d form factors 结合性是足够的：四维形状因子的全阶二维手性代数

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-10 DOI: 10.1088/1361-6382/ae0089

Víctor E Fernández and Natalie M Paquette

{"title":"Associativity is enough: an all-orders 2d chiral algebra for 4d form factors","authors":"Víctor E Fernández and Natalie M Paquette","doi":"10.1088/1361-6382/ae0089","DOIUrl":"https://doi.org/10.1088/1361-6382/ae0089","url":null,"abstract":"There is a special set of massless four-dimensional gauge theories which admit local and gauge-anomaly-free uplifts to twistor space; we call such theories twistorial. In twistorial theories, generalized towers of soft modes (including states of both helicities) form a 2d chiral algebra even at the quantum level. The 2d OPE limit of this chiral algebra coincides with the holomorphic collinear limit in 4d. This is true, in particular, for self-dual Yang–Mills theory coupled to special choices of matter, the latter being required to make the theory twistorial. Costello and the second author recently proposed that form factors of such twistorial 4d theories could be computed as 2d chiral algebra correlators. In turn, there exist form factors of self-dual theories, with insertions of appropriate local operators, that compute a subclass of observables in full (i.e. non-self-dual) QCD, coupled to appropriate matter. For example, the n-point two-loop all-plus QCD amplitude has recently been computed using the 1-loop chiral algebra OPEs determined thus far, but higher orders of the quantum-deformed chiral algebra must be determined to continue the ‘chiral algebra bootstrap’ program for higher-loop-level form factors of these twistorial theories. In this paper, using only elementary constraints from symmetries and associativity, we obtain closed-form expressions for the extended chiral algebra to arbitrary loop-order. This can be viewed as providing an all-loop result for a subset of collinear splitting functions in non-supersymmetric, massless QCD coupled to special choices of matter.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"130 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145032168","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

Periodic equatorial orbits in a black bounce scenario 黑色弹跳情景下的周期性赤道轨道

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-10 DOI: 10.1088/1361-6382/adffde

Anderson Bragado and Gonzalo J Olmo

引用次数: 0

Reconstructing source motion from gravitational wave strain 从引力波应变重建震源运动

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-10 DOI: 10.1088/1361-6382/adff33

Joe Bayley, Chris Messenger and Graham Woan

引用次数: 0

AthenaK simulations of the binary black hole merger GW150914 双黑洞合并GW150914的AthenaK模拟

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-10 DOI: 10.1088/1361-6382/adfffa

David Radice, Rossella Gamba, Hengrui Zhu and Alireza Rashti

引用次数: 0

Self-force and the Schwarzschild star 自作用力和史瓦西星

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-08 DOI: 10.1088/1361-6382/adfe4f

Abhinove N Seenivasan and Sam R Dolan

引用次数: 0

Testing compact, fused silica resonator based inertial sensors in a gravitational wave detector prototype facility 在引力波探测器原型设施中测试基于熔融硅谐振器的紧凑惯性传感器

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-08 DOI: 10.1088/1361-6382/adff34

J J Carter, P Birckigt, J Lehmann, A Basalaev, S L Kranzhoff, S Al-Kershi, M Carlassara, G Chiarini, F Khan, G Leibeling, H Lück, C Rothhardt, S Risse, P Sarkar, S Takano, J von Wrangel, D S Wu and S M Koehlenbeck

{"title":"Testing compact, fused silica resonator based inertial sensors in a gravitational wave detector prototype facility","authors":"J J Carter, P Birckigt, J Lehmann, A Basalaev, S L Kranzhoff, S Al-Kershi, M Carlassara, G Chiarini, F Khan, G Leibeling, H Lück, C Rothhardt, S Risse, P Sarkar, S Takano, J von Wrangel, D S Wu and S M Koehlenbeck","doi":"10.1088/1361-6382/adff34","DOIUrl":"https://doi.org/10.1088/1361-6382/adff34","url":null,"abstract":"Future gravitational wave observatories require significant advances in all aspects of their seismic isolation; inertial sensors being a pressing example. Inertial sensors using gram-scale high mechanical Q factor (Q) glass resonators combined with compact interferometric readout are promising alternatives to kilogram-scale conventional inertial sensors. We have produced fused silica resonators suitable for low frequency inertial sensing and demonstrated that Qs of over 150 000 are possible. One resonator we produced was combined with a homodyne quadrature interferometer (HoQI) to read out the test mass displacement to form an inertial sensor. This is the first time a HoQI was used with a high Q resonator. The resulting sensor was tested against other commercial, kilogram scale inertial sensors at the AEI 10 m Prototype facility. Despite the dynamic range challenges induced by the test mass motion, we can match the excellent noise floors HoQIs have achieved so far with slow-moving or stationary test masses, showing HoQIs as an excellent candidate for the readout of such sensors. We evaluate the setup as an inertial sensor, showing the best performance demonstrated by any gram-scale sensor to date, with comparable sensitivity to the significantly bulkier sensors used in gravitational wave detectors today. These sensors’ compact size, self-calibration, and vacuum compatibility make them ideal candidates for the inertial sensing requirements in future gravitational wave detectors.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"14 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145017633","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

Multi-sheet wormholes in the gravitational soliton formalism 引力孤子形式论中的多片虫洞

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-09-07 DOI: 10.1088/1361-6382/adfeb0

Yusuke Makita, Keisuke Izumi, Daisuke Yoshida and Keiya Uemichi

引用次数: 0

Ultra-high frequency spikes of relic gravitons 遗迹引力子的超高频率尖峰

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/adff48

Massimo Giovannini

{"title":"Ultra-high frequency spikes of relic gravitons","authors":"Massimo Giovannini","doi":"10.1088/1361-6382/adff48","DOIUrl":"https://doi.org/10.1088/1361-6382/adff48","url":null,"abstract":"The maximal frequency domain of the cosmic gravitons falls in the THz region where, without conflicting with the existing phenomenological bounds, only few particles with opposite (comoving) three-momenta are produced. As a consequence, the spectral energy density of the produced species peaks in the THz range, with features that depend upon the post-inflationary expansion rate. Although any reliable scrutiny of the ultra-high frequency spikes should include all the sources of late-time suppression at lower and intermediate frequencies, some relevant properties of the averaged multiplicities and of the spectral energy density can be derived within a reduced set of approximations that may become invalid as the frequency decreases well below the Hz. The accuracy of these concurrent approaches is assessed from the properties of the transition matrix that relates the late-time spectra to the values of the mode functions during an inflationary stage. In the obtained framework the bounds on the post-inflationary expansion rate are swiftly deduced and compare quite well with the ones including a more faithful numerical treatment. It also follows that the timeline of the post-inflationary expansion rate might be observationally accessible, in the years to come, provided the electromechanical detectors (like microwave cavities or waveguides) operating between the MHz and the THz shall eventually reach sensitivities in the chirp amplitudes which are (at least) twelve orders of magnitude smaller than the ones experimentally attainable in the audio band (i.e. between few Hz and the kHz).","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"2010 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144995513","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 novel approach for slowly rotating boson stars 慢旋转玻色子恒星的新方法

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/adfac7

Jorge F M Delgado, Juan Carlos Degollado, Luis E Martínez and Marcelo Salgado

{"title":"A novel approach for slowly rotating boson stars","authors":"Jorge F M Delgado, Juan Carlos Degollado, Luis E Martínez and Marcelo Salgado","doi":"10.1088/1361-6382/adfac7","DOIUrl":"https://doi.org/10.1088/1361-6382/adfac7","url":null,"abstract":"We present solutions to the Einstein–Klein–Gordon (EKG) system representing boson stars (BSs) in the ‘slow rotation’ approximation where the form of the metric, relative to the spherically symmetric problem, is mainly modified by the inclusion of the dragging term gtϕ while the metric components are angle independent. On the other hand, the complex-valued scalar field that source the BS is kept angle dependent, but in order to maintain the self-consistency when solving the EKG system, this dependency is averaged out in the Einstein field equations. The topology of the field is toroidal and differs drastically from the spherically symmetric treatment. Under these approximations we are able to reduce the complexity of the equations yielding a system of ordinary differential equations that is conveniently solved numerically without the need of expensive computational resources. We find sequences of solutions and describe some of their physical (global) properties such as, total mass, angular momentum and compactness. We compare our results with the fully rotating non-linear problem (where no approximations are made in the equations while keeping the stationarity, axisymmetry and circularity hypothesis) and show the region of validity of our approximation. Notably, we show that those physical properties differ in the worst scenarios up to 23% relative to the full treatment when restricting to the lowest (quantum) numbers for the rotating BS. Finally, we analyze the dynamics of particles (geodesics) in the resulting spacetime and compare our results with the full non-linear problem.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"122 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144995511","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