物理与天体物理最新文献_第5页

Phonon-induced non-equilibrium dynamics in a single solid-state spin 单固体自旋声子诱导的非平衡动力学

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-27 DOI: 10.1088/2058-9565/adf092

Ariel Norambuena, Diego Tancara, Vicente Chomalí-Castro and Daniel Castillo

引用次数: 0

A compact triaxial active vibration isolator for cryogenic suspended interferometry 一种用于低温悬浮干涉测量的紧凑型三轴主动隔振器

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-27 DOI: 10.1088/1361-6382/adf0e2

S L Kranzhoff, A Bertolini, M J C Denissen, H L M M Janssen, J Lehmann, B C T van Bree, M van Dael, M Vardaro and S Hild

{"title":"A compact triaxial active vibration isolator for cryogenic suspended interferometry","authors":"S L Kranzhoff, A Bertolini, M J C Denissen, H L M M Janssen, J Lehmann, B C T van Bree, M van Dael, M Vardaro and S Hild","doi":"10.1088/1361-6382/adf0e2","DOIUrl":"https://doi.org/10.1088/1361-6382/adf0e2","url":null,"abstract":"Suspended interferometry at cryogenic temperatures down to 10–20 K requires conductive cooling in addition to radiative cooling techniques, which is challenging due to vibrations emanating from the ground and direct force perturbations from the cryogenic system potentially acting back on the seismically isolated mirrors. In this work, the passive and active isolation performance of a triaxial cryogenic active vibration isolator designed to operate at temperatures below 10 K and ultra-high vacuum conditions with pressures below 10−9 mbar is investigated. While passive isolation of ground motion is effective for frequencies above 6.5 Hz, active suppression of motion and force disturbances can be achieved between 2.46 Hz and 21.4 Hz leading to a reduction of root-mean-square motion by one order of magnitude in the active control band. The performance limits of the current system are evaluated and compared with requirements of ETpathfinder, a prototype facility for investigating cryogenic technologies that enable the target low-frequency sensitivity improvement of the planned Einstein Telescope compared to current terrestrial gravitational-wave detectors.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"145 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144715336","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

Light in the dark forest. Part I. An efficient optimal estimator for 3D Lyman-alpha forest power spectrum 黑暗森林里的光。第一部分三维Lyman-alpha森林功率谱的高效最优估计

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-27 DOI: 10.1088/1475-7516/2025/07/085

Naim Göksel Karaçaylı and Christopher M. Hirata

{"title":"Light in the dark forest. Part I. An efficient optimal estimator for 3D Lyman-alpha forest power spectrum","authors":"Naim Göksel Karaçaylı and Christopher M. Hirata","doi":"10.1088/1475-7516/2025/07/085","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/07/085","url":null,"abstract":"The highly anisotropic nature of the Lyman-alpha (Lyα) forest data introduces a complex survey window function that complicates the measurement of the three-dimensional power spectrum (P3D). In this paper, we present the first fully optimal estimator for P3D, which exactly deconvolves the survey window function and marginalizes contaminated modes that distort the power spectrum. Our approach adapts optimal estimator techniques developed for the 2D cosmic microwave background data to the 3D case. To achieve computational feasibility, we employ the conjugate gradient method and implement the P3M formalism to handle large-scale and small-scale operations separately and efficiently. We validate our estimator using Monte Carlo mocks and Gaussian simulations, demonstrating its accuracy and computational efficiency. We confirm that mode marginalization eliminates distortions arising from quasar continuum errors and delivers robust power spectrum estimation, though it also inflates errors at large scales. This first implementation works in the flat-sky case; we discuss the remaining steps needed to generalize it to the curved-sky case. This formalism offers a foundation for the Lyα forest P3D measurements and a new path toward cosmological constraints from the Lyα forest data.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"37 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144719642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

The impact of initial conditions on quasi-normal modes 初始条件对拟正态模态的影响

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-27 DOI: 10.1088/1475-7516/2025/07/084

Ameya Chavda, Macarena Lagos and Lam Hui

{"title":"The impact of initial conditions on quasi-normal modes","authors":"Ameya Chavda, Macarena Lagos and Lam Hui","doi":"10.1088/1475-7516/2025/07/084","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/07/084","url":null,"abstract":"This study investigates the influence of initial conditions on the evolution and properties of linear quasi-normal modes (QNMs). Using a toy model with a delta effective potential in which the quasi-normal mode can be unambiguously identified, we highlight an aspect of QNMs that is long known yet often ignored: the amplitude of a QNM (after factoring out the corresponding exponential with a complex frequency) is not constant but instead varies with time. We stress that this is true even within the regime of validity of linear perturbation theory. The precise time variation depends on the initial conditions, as we show here for Gaussian and S-shaped initial conditions. Furthermore, it is possible to find initial conditions for which the QNM even fails to materialize; it is also possible to find those for which the QNM amplitude grows indefinitely. Focusing on cases where the QNM amplitude does stabilize at late times, we explore how this timescale for amplitude stabilization depends on the shape and location of the initial perturbation profile. Our findings underscore the need for care in fitting linear QNMs to ringdown data, and for a better understanding of the initial conditions. They also suggest recent computations of quadratic QNMs, sourced purely by stabilized linear QNMs, may not fully capture what determines the amplitude of the quadratic QNMs, even at late times. Our results motivate a detailed investigation of the initial perturbations generated in the aftermath of a binary merger.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"18 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144719641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Signal-to-noise ratio analytic formulae of the inspiral binary black holes in TianQin 天琴吸气双黑洞的信噪比解析公式

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-27 DOI: 10.1088/1361-6382/adecd9

Hong-Yu Chen, Han Wang, En-Kun Li and Yi-Ming Hu

引用次数: 0

Constraints on the γ-parameter for the vacuum solution of Cotton gravity with geodesics and shadows 带测地线和阴影的棉花重力真空解的γ参数约束

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-27 DOI: 10.1088/1361-6382/adf0ba

Ednaldo L B Junior, José Tarciso S S Junior, Francisco S N Lobo, Manuel E Rodrigues, Diego Rubiera-Garcia, Luís F Dias da Silva and Henrique A Vieira

{"title":"Constraints on the γ-parameter for the vacuum solution of Cotton gravity with geodesics and shadows","authors":"Ednaldo L B Junior, José Tarciso S S Junior, Francisco S N Lobo, Manuel E Rodrigues, Diego Rubiera-Garcia, Luís F Dias da Silva and Henrique A Vieira","doi":"10.1088/1361-6382/adf0ba","DOIUrl":"https://doi.org/10.1088/1361-6382/adf0ba","url":null,"abstract":"We consider a recently introduced extension of General Relativity based on the use of the Cotton tensor and dubbed as Cotton gravity, to estimate the size of a new constant γ appearing within a spherically symmetric, vacuum solution of such theory. Taking into account its non-asymptotically flat character, we use the inferred size of the central brightness depression of the supermassive object at the heart of the Milky Way galaxy (Sgr A*) by the Event Horizon Telescope to constrain at 2σ) the CG parameter as . We study the potential observational consequences from the smallness of such a value using exact and numerical expressions for the deflection angle, optical images from optically and geometrically thin accretion disks, isoradials, and instability scales (Lyapunov index) of nearly bound geodesics associated to photon rings. Our results point towards the impossibility to distinguish between these two geometries using current and foreseeable techniques in the field of interferometric detection of optical sources.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"63 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144715346","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

Reconfigurable integrated photonic processor based on parallel-coupled microring assisted MZI 基于并行耦合微环辅助MZI的可重构集成光子处理器

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2025-07-26 DOI: 10.1016/j.optcom.2025.132262

Hao Hou , Yaohui Sun , Qichao Wang , Enze Zhou , Guohua Hu , Binfeng Yun , Liguo Shuai , Yiping Cui

{"title":"Reconfigurable integrated photonic processor based on parallel-coupled microring assisted MZI","authors":"Hao Hou , Yaohui Sun , Qichao Wang , Enze Zhou , Guohua Hu , Binfeng Yun , Liguo Shuai , Yiping Cui","doi":"10.1016/j.optcom.2025.132262","DOIUrl":"10.1016/j.optcom.2025.132262","url":null,"abstract":"<div><div>To address the diverse demands in various application scenarios, such as optical filtering and microwave signal processing, an integrated photonic processor with function reconfigurability and performance tunability is increasingly attracting attention and research efforts. In this work, we propose and experimentally validate a reconfigurable photonic processor based on parallel-coupled microring assisted Mach-Zehnder interferometer (MZI). By controlling metal heaters above the device, the device can be reconfigured to perform multiple functions with distinct performance characteristics, including optical switch, finite impulse response (FIR) and infinite impulse response (IIR) filtering, resonance splitting, electromagnetically induced transparency (EIT)-like resonance, and Fano resonances. The experimental results demonstrate that the proposed photonic processor has flexible function reconfigurability and can be effectively tuned to meet specific application requirements, highlighting its significant practical value.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"592 ","pages":"Article 132262"},"PeriodicalIF":2.2,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713844","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

STMFuse: spatiotemporal feature saliency change-driven mimic fusion for infrared and visible video STMFuse：时空特征显著性变化驱动的红外和可见光视频模拟融合

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-07-26 DOI: 10.1016/j.optlastec.2025.113640

Yanchen Meng , Fengbao Yang , Jiangtao Xi , Xiaoxia Wang , Linna Ji , Bo Li , Xiaoming Guo

{"title":"STMFuse: spatiotemporal feature saliency change-driven mimic fusion for infrared and visible video","authors":"Yanchen Meng , Fengbao Yang , Jiangtao Xi , Xiaoxia Wang , Linna Ji , Bo Li , Xiaoming Guo","doi":"10.1016/j.optlastec.2025.113640","DOIUrl":"10.1016/j.optlastec.2025.113640","url":null,"abstract":"<div><div>The variable and unpredictable distribution of spatiotemporal features in infrared–visible videos under complex dynamic environments is addressed, where traditional fusion algorithms with fixed architectures are found to fail when adapting to continuous dynamic changes in feature distributions, resulting in blurred fusion outcomes and loss of critical detail information. To overcome this bottleneck, a mimic fusion method based on spatiotemporal feature saliency change-driven approach, termed STMFuse, is proposed, whereby spatiotemporal feature variations are continuously monitored and the fusion architecture is dynamically reconfigured, thereby ensuring optimal fusion performance. Specifically, a spatiotemporal dual-domain feature perception module extracts single-modal temporal change features and cross-modal difference features to comprehensively capture dynamic scene characteristics. To address the inadequacy of single threshold settings in measuring dynamic feature variations, a possibility distribution function and synthesis rules is constructed to quantify feature change degree, utilizing significant change features as driving factors for mimic variant adjustments. By investigating the dynamic correlation between feature changes and fusion quality metrics, a mimic variant evaluation function based on correlation coefficient weighting is established, mapping the relationship between features and mimic variants. Finally, a multi-feature collaborative decision mechanism based on energy functions is designed to determine the optimal mimic variant combination by integrating various feature change characteristics. Extensive experimental validation demonstrates that STMFuse significantly outperforms existing methods in terms of adaptive fusion performance and robustness in dynamic scenes, exhibiting superior preservation of edges, texture details, and enhanced visual perception quality.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113640"},"PeriodicalIF":4.6,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144711162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Higher Speed Multispectral Imaging Using a Thin Liquid Crystal Layer in Metal Cavity and Artificial Intelligence Reconstruction Algorithm 金属腔内薄液晶层高速多光谱成像及人工智能重建算法

IF 11 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2025-07-26 DOI: 10.1002/lpor.202500547

Doron Pasha, Majd Abu Aisheh, Isaac Y. August, Ibrahim Abdulhalim

{"title":"Higher Speed Multispectral Imaging Using a Thin Liquid Crystal Layer in Metal Cavity and Artificial Intelligence Reconstruction Algorithm","authors":"Doron Pasha, Majd Abu Aisheh, Isaac Y. August, Ibrahim Abdulhalim","doi":"10.1002/lpor.202500547","DOIUrl":"https://doi.org/10.1002/lpor.202500547","url":null,"abstract":"A concept and demonstration of a fast multispectral imager operating across the visible (Vis) and near‐infrared (NIR) ranges is presented. This system utilizes a specially designed LC tunable metal‐insulator‐metal (MIM) cavity combined with a passive multiband pass filter (MBF). The integration of the MBF with the MIM device, along with advanced artificial intelligence algorithms, provides several key benefits: i) lower production cost, ii) dual functionality of the metal layers as reflectors and electrodes, iii) a richer spectrum exhibiting a larger number of peaks and valleys at reduced thickness, enabling faster switching and robust spectrum reconstruction, iv) a broader operational spectrum, v) higher light throughput as only one polarizer is needed, vi) reduced tolerance requirements on the contrast of the spectrum due to the use of artificial neural nets reconstruction algorithm, and vii) lower operation voltage. The MIM tunable device exhibits as fast as 50 µs stabilization time with an average value of 250 µs, and a total acquisition time of <5 ms, highlighting the potential of this technology for high‐rate multispectral video. The system's applicability is demonstrated in food monitoring, showcasing its potential for real‐time efficient spectral analysis.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"118 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Timing‐Injection Locking in a Self‐Starting Mamyshev Oscillator Induced by the Dissipative Faraday Instability 耗散法拉第不稳定性诱导的自启动马米舍夫振荡器的定时注入锁定

IF 11 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2025-07-26 DOI: 10.1002/lpor.202500742

Changqing Li, Ran Xia, Yutai Zhao, Yifang Li, Jia Liu, Christophe Finot, Xiahui Tang, Gang Xu

{"title":"Timing‐Injection Locking in a Self‐Starting Mamyshev Oscillator Induced by the Dissipative Faraday Instability","authors":"Changqing Li, Ran Xia, Yutai Zhao, Yifang Li, Jia Liu, Christophe Finot, Xiahui Tang, Gang Xu","doi":"10.1002/lpor.202500742","DOIUrl":"https://doi.org/10.1002/lpor.202500742","url":null,"abstract":"Mamyshev oscillators (MOs), a novel class of passively mode‐locked fiber lasers, serve as an excellent platform to explore complex nonlinear dynamics, ranging from localized structures to chaos. Despite their versatility, achieving self‐starting mode‐locking remains a significant challenge. In this study, the critical role of the dissipative Faraday instability (DFI) in facilitating the self‐starting process of Mos is unveiled, where the DFI triggers the symmetry breaking of the homogeneous solution to overcome the initiation barriers. A panoramic view of several distinct operational regimes with distinct DFI patterns is provided, namely the non‐self‐starting states, the irregular patterns, the harmonic mode locking regime, the stable single pulse and the stable multi pulse regime. For the latest case, the origins of randomness in these pulse sequences through analyzing the causality between the timing of the random pulses and the initial seeding conditions are uncovered. Building upon these findings, the novel time‐injection locking technique is proposed to customize the temporal locations of the pulses as well as the pattern timing in MOs, thus demonstrating its potential for applications in all‐optical data storage and tunable ultrashort pulse sources.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"12 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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