Science China Physics, Mechanics & Astronomy最新文献

{"title":"The impact of the Hubble tension on the evidence for dynamical dark energy","authors":"Ye-Huang Pang,&nbsp;Xue Zhang,&nbsp;Qing-Guo Huang","doi":"10.1007/s11433-025-2713-8","DOIUrl":"10.1007/s11433-025-2713-8","url":null,"abstract":"<div><p>Recent findings from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2) favor a dynamical dark energy characterized by a phantom crossing feature. This result also implies a lower value of the Hubble constant, thereby intensifying the so-called Hubble tension. To alleviate the Hubble tension, we consider the early dark energy and explore its impact on the evidence for dynamical dark energy including the Hubble constant calibrated by the SH0ES collaboration. We find that incorporating SH0ES prior with CMB, DESI DR2 BAO and Pantheon Plus/Union3/DESY5 data reduces the preference to dynamical dark energy to 1.5<i>σ</i>/1.4<i>σ</i>/2.4<i>σ</i> level, respectively. Our results suggest a potential tension between the Hubble constant <i>H</i>₀ of the SH0ES measurement and the phantom-to-quintessence transition in dark energy favored by DESI DR2 BAO data.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 8","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169202","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}

{"title":"Unveiling the origins of repeating fast radio bursts through long-term polarimetric observations","authors":"Shi Dai","doi":"10.1007/s11433-025-2681-5","DOIUrl":"10.1007/s11433-025-2681-5","url":null,"abstract":"","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 8","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169546","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}

{"title":"Manipulating perfect vector vortex beams with six degrees of freedom","authors":"Xianzhong Chen","doi":"10.1007/s11433-025-2683-9","DOIUrl":"10.1007/s11433-025-2683-9","url":null,"abstract":"","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 8","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169545","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}

{"title":"Multi-year polarimetric monitoring of four CHIME-discovered repeating fast radio bursts with FAST","authors":"Yi Feng,&nbsp;Yong-Kun Zhang,&nbsp;Jintao Xie,&nbsp;Yuan-Pei Yang,&nbsp;Yuanhong Qu,&nbsp;Dengke Zhou,&nbsp;Di Li,&nbsp;Bing Zhang,&nbsp;Weiwei Zhu,&nbsp;Wenbin Lu,&nbsp;Jiaying Xu,&nbsp;Chenchen Miao,&nbsp;Shiyan Tian,&nbsp;Pei Wang,&nbsp;Ju-Mei Yao,&nbsp;Chen-Hui Niu,&nbsp;Jiarui Niu,&nbsp;Heng Xu,&nbsp;Jinchen Jiang,&nbsp;Dejiang Zhou,&nbsp;Zenan Liu,&nbsp;Chao-Wei Tsai,&nbsp;Zigao Dai,&nbsp;Xuefeng Wu,&nbsp;Fayin Wang,&nbsp;Jinlin Han,&nbsp;Kejia Lee,&nbsp;Renxin Xu,&nbsp;Yongfeng Huang,&nbsp;Yuanchuan Zou,&nbsp;Jinhuang Cao,&nbsp;Xianglei Chen,&nbsp;Jianhua Fang,&nbsp;Dongzi Li,&nbsp;Ye Li,&nbsp;Wanjin Lu,&nbsp;Jiawei Luo,&nbsp;Jintao Luo,&nbsp;Rui Luo,&nbsp;Fen Lyu,&nbsp;Bojun Wang,&nbsp;Weiyang Wang,&nbsp;Qin Wu,&nbsp;Mengyao Xue,&nbsp;Di Xiao,&nbsp;Wenfei Yu,&nbsp;Jianping Yuan,&nbsp;Chunfeng Zhang,&nbsp;Junshuo Zhang,&nbsp;Lei Zhang,&nbsp;Songbo Zhang,&nbsp;Rushuang Zhao,&nbsp;Yuhao Zhu","doi":"10.1007/s11433-024-2668-5","DOIUrl":"10.1007/s11433-024-2668-5","url":null,"abstract":"<div><p>Fast radio bursts (FRBs) are bright, millisecond-duration radio emissions originating from cosmological distances. In this study, we report multi-year polarization measurements of four repeating FRBs initially discovered by the Canadian Hydrogen Intensity Mapping Experiment (CHIME): FRBs 20190117A, 20190208A, 20190303A, and 20190417A. We observed the four repeating FRBs with the Five-hundred-meter Aperture Spherical Radio Telescope (FAST), detecting a total of 66 bursts. Two bursts from FRB 20190417A exhibit a circular polarization signal-to-noise ratio greater than 7, with the highest circular polarization fraction recorded at 35.7%. While the bursts from FRBs 20190208A and 20190303A are highly linearly polarized, those from FRBs 20190117A and 20190417A show depolarization due to multi-path propagation, with <i>σ</i>_RM = 2.78 ± 0.05 and 5.19 ± 0.09 rad m⁻², respectively. The linear polarization distributions among five repeating FRBs—FRBs 20190208A, 20190303A, 20201124A, 20220912A, and 20240114A—are nearly identical but show distinct differences from those of non-repeating FRBs. FRBs 20190117A, 20190303A, and 20190417A exhibit substantial rotation measure (RM) variations between bursts, joining other repeating FRBs in this behavior. Combining these findings with published results, 64% of repeating FRBs show RM variations greater than 50 rad m⁻², and 21% exhibit RM reversals. A significant proportion of repeating FRBs reside in a dynamic magneto-ionic environment. The structure function of RM variations shows a power-law index of <i>γ</i> ∼ (0–0.8), corresponding to a shallow power spectrum <i>α</i> = −(<i>γ +</i> 2) ∼ −(2.0–2.8) of turbulence, if the RM variations are attributed to turbulence. This suggests that the variations are dominated by small-scale RM density fluctuations. We perform K-S tests to compare the RMs of repeating and non-repeating FRBs, which reveal a marginal dichotomy in the distribution of their RMs. We caution that the observed dichotomy may be due to the small sample size and selection biases.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 8","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169203","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}

{"title":"Hydrodynamics of ultralight complex scalar field dark matter and its impact on the growth of structure","authors":"Qi Yang,&nbsp;Bohua Li,&nbsp;Paul R. Shapiro","doi":"10.1007/s11433-025-2700-y","DOIUrl":"10.1007/s11433-025-2700-y","url":null,"abstract":"<div><p>The mass window of ultralight axion dark matter motivated by suppressing the growth of structure on subgalactic scales, <i>m</i> ∼ 10⁻²² eV, is now severely constrained by various observation data (e.g., Lyman-<i>α</i> forest). As an attempt to reopen this mass window, we investigate an alternative ultralight dark matter candidate, the complex scalar field dark matter (SFDM). We derive the relativistic hydrodynamics of the complex SFDM in the framework of cosmological perturbation theory. Our formalism contains two novel ingredients uniquely associated with the complex SFDM model: the Eckart frame defined by the conserved Noether current, and the stiff gauge condition, <span>(c_{s}^{2}equiv(delta P/deltarho)vert_{s}=1)</span>. In the Eckart frame, the complex SFDM is effectively an imperfect fluid with a dissipative energy flux, distinguishing itself from axion dark matter. The energy flux can affect the growth of density fluctuations dynamically. Meanwhile, we apply the stiff gauge condition to find new constitutive equations for the complex SFDM. We revisit the homogeneous evolution of the complex SFDM and present illustrative early-stage solutions for perturbations of the complex SFDM in a simplified setting. We demonstrate the effects of varying the model parameters on the evolution of the perturbation variables.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 8","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168514","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}

{"title":"3d flat bands and coupled 4f moments in the kagome-honeycomb permanent magnet Sm2Co17","authors":"Hao Zheng,&nbsp;Zhiguang Xiao,&nbsp;Ze Pan,&nbsp;Guowei Yang,&nbsp;Yonghao Liu,&nbsp;Jianzhou Bian,&nbsp;Yi Wu,&nbsp;Teng Hua,&nbsp;Jiawen Zhang,&nbsp;Jiayi Lu,&nbsp;Jiong Li,&nbsp;Tulai Sun,&nbsp;Yu Song,&nbsp;Ruihua He,&nbsp;J. Larrea Jiménez,&nbsp;Guanghan Cao,&nbsp;Huiqiu Yuan,&nbsp;Yuanfeng Xu,&nbsp;Yi Yin,&nbsp;Ming Shi,&nbsp;Chao Cao,&nbsp;Yang Liu","doi":"10.1007/s11433-025-2677-x","DOIUrl":"10.1007/s11433-025-2677-x","url":null,"abstract":"<div><p>Rare earth permanent magnets (REPMs) with both localized moments and itinerant conduction bands are not only important for fundamental research but also have significant technological applications. In particular, Sm₂Co₁₇ is a prototypical high-temperture REPM, where the Co atoms form a kagome-honeycomb stacked lattice. Here we report the synthesis of epitaxial Sm₂Co₁₇ films using molecular beam epitaxy and measurements of their momentum-resolved electronic structure from <i>in-situ</i> angle-resolved photoemission spectroscopy. Our results unveil two flat bands from Co 3<i>d</i> orbitals near the Fermi level (<i>E</i>_<i>F</i>), one at ∼ −300 meV and another right at <i>E</i>_<i>F</i>, which arise from orbital-selective destructive interference and strong electron correlations, respectively. In addition, our results reveal that Sm 4<i>f</i> states are far away from <i>E</i>_<i>F</i> (hence mostly localized) and exhibit an anomalous temperature dependence, caused by the 3<i>d</i>-4<i>f</i> magnetic coupling. Our findings provide direct spectroscopic insights to understand the strong uniaxial ferromagnetism in Sm₂Co₁₇ (and REPMs alike). Our work also opens avenues to explore flat-band physics near <i>E</i>_<i>F</i> and emergent phenomena in correlated kagome-honeycomb lattices.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 8","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169506","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}

{"title":"Finding high-velocity stars from globular clusters: Completing the final link in the evidence chain for IMBHs","authors":"Warren R. Brown","doi":"10.1007/s11433-025-2728-y","DOIUrl":"10.1007/s11433-025-2728-y","url":null,"abstract":"","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 9","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167947","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}

{"title":"Breaking the bottleneck: A dual-narrowband imaging system for scalable radial velocity monitoring","authors":"David Buckley","doi":"10.1007/s11433-025-2724-6","DOIUrl":"10.1007/s11433-025-2724-6","url":null,"abstract":"","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 9","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168471","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}

{"title":"A quantum-inspired deep neural network framework for physically constrained PDEs","authors":"Jinsong Tang,&nbsp;Jia Xiong,&nbsp;Ali Minaeian,&nbsp;Yekang Jie,&nbsp;Shiying Xiong","doi":"10.1007/s11433-025-2649-9","DOIUrl":"10.1007/s11433-025-2649-9","url":null,"abstract":"<div><p>We propose a novel quantum-inspired deep neural network framework (QIDNNF) for solving partial differential equations (PDEs), specifically Schrödinger equation and those derived through Schrödingerization. QIDNNF integrates fundamental quantum mechanics principles, including global phase invariance and normalization, to ensure unitary quantum dynamics and the preservation of conservation laws. Through numerical experiments, QIDNNF exhibits superior stability over finite difference schemes for large time steps, improved long-term accuracy over neural ordinary differential equations (Neural ODEs) and physics-informed neural networks (PINNs), and predictive precision unaffected by variations in initial phase angles. Furthermore, QIDNNF effectively models real-world physical systems, including 1D nonlinear wave propagation and 2D and 3D flow evolution, demonstrating their accuracy and consistency in simulating complex physical phenomena.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 10","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169000","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}

{"title":"A review on periodic orbits of the general planar three-body problem","authors":"Xiaoming Li,&nbsp;Shijun Liao","doi":"10.1007/s11433-024-2686-6","DOIUrl":"10.1007/s11433-024-2686-6","url":null,"abstract":"<div><p>The three-body problem continues to be an unsolved challenge in the scientific community. It serves as a foundational model for exploring nonlinear dynamics, astrophysics, and orbital mechanics. Due to the inherently chaotic nature of the three-body problem, periodic orbits are regarded as the primary framework that forms the backbone of the system, which provides crucial insights into its dynamical properties. In this review, we examine both historical and recent advances in the study of periodic orbits for the planar three-body problem. We provide an overview of the general three-body problem, the definition and identification of numerical periodic orbits, and the topological classification methods used to categorize these solutions. Additionally, we describe the clean numerical simulation (CNS) employed to obtain accurate trajectories, as well as both analytical and numerical results for periodic orbits in systems with different initial configurations, with equal or unequal masses, with or without angular momentum. The review also covers key topics such as linear stability analysis and the extension of Kepler’s third law to general three-body problems. Finally, we highlight several open questions and promising directions for future research in this field.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 8","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168460","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}