Classical and Quantum Gravity最新文献_第2页

Linearized transverse diffeomorphism invariant spin-2 theories via gauge invariants 基于规范不变量的线性化横向微分同胚不变量自旋-2理论

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-19 DOI: 10.1088/1361-6382/ae5d1b

D Dalmazi and Luiz G M Ramos

引用次数: 0

Long short-term memory for early warning detection of gravitational waves 用于引力波预警探测的长短期记忆

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-16 DOI: 10.1088/1361-6382/ae5d1a

Reem Alfaidi and Christopher Messenger

{"title":"Long short-term memory for early warning detection of gravitational waves","authors":"Reem Alfaidi and Christopher Messenger","doi":"10.1088/1361-6382/ae5d1a","DOIUrl":"https://doi.org/10.1088/1361-6382/ae5d1a","url":null,"abstract":"Pre-merger detection of gravitational waves during the early inspiral of compact binary coalescences would enable electromagnetic observations of the earliest merger stages. This would significantly impact multi-messenger astronomy, giving astronomers potential access to rich new information. Here, we introduce a proof-of-concept deep-learning-based approach to produce early-warning alerts for binary black hole systems. We show the possibility of using a long short-term memory network trained on the whitened detector strain in the time domain to detect and classify compact binary events. In this work, we consider a single advanced laser interferometer gravitational-wave observatory detector at design sensitivity and make approximate sensitivity and early warning capability comparisons with approximations to traditional matched filtering approaches. We find that our model is competitive in both aspects, and when applied to a simulated test dataset was able to produce an early alert up to 5.3 s before the merger at a fixed false-alarm rate of one per day. These results demonstrate the feasibility of lightweight, low-latency recurrent neural networks for rapid gravitational-wave discovery, providing a pathway toward real-time early-warning systems for multi-messenger follow-up. This proof-of-concept in Gaussian noise for a single detector is readily extendable to real multi-detector observations.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"22 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147695325","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

Stabilizing charged Dyson shells through the cosmological constant 通过宇宙常数稳定带电戴森壳层

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-16 DOI: 10.1088/1361-6382/ae5da9

S Habib Mazharimousavi

引用次数: 0

Fractional holographic dark energy driven reconstruction of f(Q) gravity and its cosmological implications 分数全息暗能量驱动的f(Q)引力重建及其宇宙学意义

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-16 DOI: 10.1088/1361-6382/ae5cf4

Rajdeep Mazumdar, Kalyan Malakar and Kalyan Bhuyan

{"title":"Fractional holographic dark energy driven reconstruction of f(Q) gravity and its cosmological implications","authors":"Rajdeep Mazumdar, Kalyan Malakar and Kalyan Bhuyan","doi":"10.1088/1361-6382/ae5cf4","DOIUrl":"https://doi.org/10.1088/1361-6382/ae5cf4","url":null,"abstract":"To explain the late-time acceleration of the Universe, we reconstruct an f(Q) gravity model inspired by fractional holographic dark energy (FHDE) with the Hubble horizon as the infrared cutoff. This reconstructed f(Q) gravity model shows a geometrically motivated dark energy component and naturally recovers general relativity in the appropriate limit. The free parameters of the model are constrained using the latest DESI baryon acoustic oscillation (BAO) data, previous BAO compilations, and cosmic chronometer datasets through a Markov Chain Monte Carlo analysis. The reconstructed Hubble parameter H(z) exhibits excellent consistency with observational data, with high values of R2 and low values of , Akaike information criterion, and Bayesian information criterion, confirming the model’s strong statistical performance relative to ΛCDM. With current deceleration parameter and a transition redshift –0.46, the dynamical diagnostics show a smooth transition from a decelerated to an accelerated phase. While the Om(z) diagnostic exhibits a negative slope, indicating that the model is not ΛCDM like in behaviour, Statefinder diagnostics shows the model to have quintessence like behaviour. The analysis of classical energy conditions shows that the WEC, DEC, and NEC are satisfied throughout the cosmic evolution, with a violation of the SEC at lower-redshift, which is consistent with late-time acceleration. Linear homogeneous perturbation analysis further confirms the model’s dynamical stability. Conclusively, the FHDE-inspired reconstructed f(Q) gravity provides a stable, observationally compatible, and geometrically motivated alternative to ΛCDM, that successfully describes the late-time cosmic acceleration within the symmetric teleparallel framework.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"8 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147695330","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

Disentangling spinning and nonspinning binary black hole populations with spin sorting 带自旋分选的自旋和非自旋双黑洞居群解纠缠

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-16 DOI: 10.1088/1361-6382/ae54f7

Lillie Szemraj and Sylvia Biscoveanu

{"title":"Disentangling spinning and nonspinning binary black hole populations with spin sorting","authors":"Lillie Szemraj and Sylvia Biscoveanu","doi":"10.1088/1361-6382/ae54f7","DOIUrl":"https://doi.org/10.1088/1361-6382/ae54f7","url":null,"abstract":"The individual component spins of binary black holes (BBHs) are difficult to resolve using gravitational-wave observations but carry key signatures of the processes shaping their formation and evolution. Recent analyses have found conflicting evidence for a sub-population of black holes with negligible spin, but the Default spin magnitude population model used in LIGO-Virgo-KAGRA analyses cannot formally accommodate an excess of systems with zero spin. In this work, we analyze several different simulated BBH populations to demonstrate that even in the face of this mismodeling, spinning and nonspinning populations can be reliably distinguished using the Default spin magnitude population model coupled with spin sorting. While typical analyses sort the binary components by their masses, sorting the components by their spin magnitudes instead offers a complementary view of the properties of individual systems consistent with equal mass and of population-level properties, given binary evolution processes like tidal-spin up that predict asymmetric spin magnitudes among the binary components. We conclude that current observations of the BBH population are inconsistent with a fully nonspinning population, but could be explained by a population with only one spinning black hole per binary or a population with up to nonspinning sources.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"24 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147695326","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

Enhancing the scientific exploitation of future gravitational wave experiments through a multi-messenger approach 通过多信使方法加强对未来引力波实验的科学开发

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-15 DOI: 10.1088/1361-6382/ae59e3

Florentina-Crenguta Pislan, Laurentiu-Ioan Caramete and Ana Caramete

{"title":"Enhancing the scientific exploitation of future gravitational wave experiments through a multi-messenger approach","authors":"Florentina-Crenguta Pislan, Laurentiu-Ioan Caramete and Ana Caramete","doi":"10.1088/1361-6382/ae59e3","DOIUrl":"https://doi.org/10.1088/1361-6382/ae59e3","url":null,"abstract":"We propose a multi-messenger approach by using electromagnetically observed parameters, like masses and redshifts, to refine predictions on the gravitational wave (GW) detection, while exploring unknown parameters, such as spins. This approach aims to construct a comprehensive observational catalog consisting of potential GW sources such as mergers of supermassive black holes (BHs) in quasars and X-shaped radio galaxies. Through a literature review, we compiled a preliminary catalog of potential sources. For these identified systems, we determined the key parameters crucial for GW modeling. One of our goals with this is to create a library of potential gravitational waveforms that could serve the GW community as training/testing data for the data analysis pipelines. This database is also meant to be used for the development of future data analysis tools that will be essential in processing and interpreting the data produced by the current and upcoming GW experiments. Using the LISA data challenge tools, so far we have modeled over 20 000 gravitational waveforms coming from potential systems of massive BH binaries and we intend to extend it up to a few hundred thousand waveforms coming from other binary systems as well. In this paper, we present the methods used for estimating the parameters of those sources that could emit electromagnetic counterparts of the GWs that LISA and other next-generation GW experiments may detect.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"242 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147695339","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

Images of the accretion disk in hybrid metric-Palatini gravity 混合公制-帕拉蒂尼重力的吸积盘图像

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-15 DOI: 10.1088/1361-6382/ae5b19

P I Dyadina and N A Avdeev

{"title":"Images of the accretion disk in hybrid metric-Palatini gravity","authors":"P I Dyadina and N A Avdeev","doi":"10.1088/1361-6382/ae5b19","DOIUrl":"https://doi.org/10.1088/1361-6382/ae5b19","url":null,"abstract":"In this paper we obtain and study images of accretion disks around static spherically symmetric black holes in hybrid metric-Palatini gravity. We use Novikov–Thorne thin-disk model. Semi-analytic ray-tracing methods in curved spacetime are employed to generate the images of the disk for different scalar field configurations, including both Higgs-type potentials and cases without a potential. The resulting images, including both redshift and intensity maps, are analyzed. The results show that the scalar field parameters play a significant role in shaping both the direct and secondary images of the disk, while the inclination angle primarily affects the asymmetry and brightness distribution. In particular, configurations with extreme scalar field values lead to cooler and dimmer disk compared to general relativity (GR). Furthermore, the structure and angular size of the secondary ring exhibit noticeable deviations from GR, offering a potential observational signature. This work should be regarded as a first step toward modeling realistic accretion disks within the hybrid metric-Palatini gravity framework, and toward assessing their potential observational distinguishability from GR predictions.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"52 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147695340","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

BHaHAHA: a fast, robust apparent horizon finder library for numerical relativity BHaHAHA：一个快速、健壮的视地平仪库，用于数值相对论

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-13 DOI: 10.1088/1361-6382/ae09e9

Zachariah B Etienne, Thiago Assumpção, Leonardo Rosa Werneck and Samuel D Tootle

{"title":"BHaHAHA: a fast, robust apparent horizon finder library for numerical relativity","authors":"Zachariah B Etienne, Thiago Assumpção, Leonardo Rosa Werneck and Samuel D Tootle","doi":"10.1088/1361-6382/ae09e9","DOIUrl":"https://doi.org/10.1088/1361-6382/ae09e9","url":null,"abstract":"Apparent horizon (AH) finders are essential for characterizing black holes and excising their interiors in numerical relativity (NR) simulations. However, open-source AH finders to date are tightly coupled to individual NR codes. We introduce BHaHAHA, the BlackHoles@Home AH Algorithm, the first open-source, infrastructure-agnostic library for AH finding in NR. BHaHAHA implements the first-ever hyperbolic flow-based approach, recasting the elliptic partial differential equation for a marginally outer trapped surface as a damped nonlinear wave equation. To enhance performance, BHaHAHA incorporates a multigrid-inspired refinement strategy, an over-relaxation technique, and OpenMP parallelization. When compared to a naïve hyperbolic relaxation implementation, these enhancements result in 64x speedups for difficult common-horizon finds on a single spacetime slice, enabling BHaHAHA to achieve runtimes within 10% of the widely used (single-core) AHFinderDirect and outperform it on multiple cores. For dynamic horizon tracking with typical core counts on a high-performance-computing cluster, BHaHAHA is approximately 2.1 times faster than AHFinderDirect at accuracies limited by interpolation of metric data from the host NR code. Implemented and tested in both the Einstein Toolkit and BlackHoles@Home, BHaHAHA demonstrates that hyperbolic relaxation can be a robust, versatile, and performant approach for AH finding.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"21 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147666470","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

Detecting the Unruh effect via an engineered low-mass field in a superconducting qubit 通过超导量子比特中的工程低质量场检测Unruh效应

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-13 DOI: 10.1088/1361-6382/ae5b1c

Vladimir Toussaint

{"title":"Detecting the Unruh effect via an engineered low-mass field in a superconducting qubit","authors":"Vladimir Toussaint","doi":"10.1088/1361-6382/ae5b1c","DOIUrl":"https://doi.org/10.1088/1361-6382/ae5b1c","url":null,"abstract":"Detecting the Unruh effect is a major challenge in fundamental physics. It is known that exciting massive fields with the Unruh thermal bath is heavily suppressed when the field’s rest energy is much larger than the acceleration energy scale, . However, the standard literature lacks an explicit quantitative derivation of this suppression. In this work, we first fill this gap by deriving the exponential suppression, , in two different frameworks: a (3+1)-dimensional Unruh–deWitt detector and a (1+1)-dimensional cavity QED setup. This shows the suppression is universal and sets an insurmountable barrier for any detection method that relies on exciting massive fields. For an electron-mass field at achievable accelerations ( m s−2), the suppression exceeds 109 orders of magnitude. To avoid this suppression, the field’s rest energy must be less than or of the order of the acceleration energy scale, . Achieving this condition, however, requires astronomically high accelerations. For example, detecting the effect for an electron-mass field would require accelerations of m s−2, which is far beyond experimental reach. While using a massless field avoids this suppression, we show the best strategy is not to avoid mass, but to engineer a small effective mass that satisfies the optimal condition . We propose a concrete implementation using a superconducting circuit with a Josephson persistent-current qubit (the analog of a UdW detector) coupled to a microwave resonator (the analog of the scalar field). For this system, the optimal condition is , where is the persistent current, ΔΦ is the magnetic flux swing, and Δ is the qubit’s tunneling energy gap. For a fixed experimental setup , at the optimal condition, we predict a linear excitation probability . Here, is the frequency modulation depth and is a constant that determines the slope. This provides a direct falsifiable prediction for observing the Unruh effect in the optimal regime using a superconducting qubit.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"18 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147666466","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 new rotating axionic AdS4 black hole dressed with a scalar field 带标量场的新型旋转轴子AdS4黑洞

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2026-04-12 DOI: 10.1088/1361-6382/ae5866

Moisés Bravo-Gaete, Fabiano F Santos, Jhony A Herrera-Mendoza and Daniel F Higuita-Borja

引用次数: 0