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The rapid advancement of diffusion models has significantly improved high-quality image generation, making generated content increasingly challenging to distinguish from real images and raising concerns about potential misuse. In this…

Computer Vision and Pattern Recognition · Computer Science 2025-11-04 Beilin Chu , Xuan Xu , Xin Wang , Yufei Zhang , Weike You , Linna Zhou

We report the properties of more than 600 bursts (including cluster-bursts) detected from the repeating fast radio burst (FRB) source FRB 20201124A with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) during an extremely…

High Energy Astrophysical Phenomena · Physics 2023-01-04 D. J. Zhou , J. L. Han , B. Zhang , K. J. Lee , W. W. Zhu , D. Li , W. C. Jing , W. -Y. Wang , Y. K. Zhang , J. C. Jiang , J. R. Niu , R. Luo , H. Xu , C. F. Zhang , B. J. Wang , J. W. Xu , P. Wang , Z. L. Yang , Y. Feng

The $\Lambda$CDM model successfully explains the majority of cosmological observations. However, the $\Lambda$CDM model is challenged by Hubble tension, a remarkable difference of Hubble constant $H_0$ between measurements from local probe…

Cosmology and Nongalactic Astrophysics · Physics 2022-04-18 Q. Wu , G. Q. Zhang , F. Y. Wang

The discovery of radio pulsars over a half century ago was a seminal moment in astronomy. It demonstrated the existence of neutron stars, gave a powerful observational tool to study them, and has allowed us to probe strong gravity, dense…

High Energy Astrophysical Phenomena · Physics 2019-06-05 E. Petroff , J. W. T. Hessels , D. R. Lorimer

We present a survey for transient and variable sources, on timescales from 28 seconds to $\sim$1 year, using the Murchison Widefield Array (MWA) at 182 MHz. Down to a detection threshold of 0.285 Jy, no transient candidates were identified,…

Fast Radio Bursts (FRBs) are extragalactic millisecond-duration radio transients whose nature remains unknown. The advent of numerous facilities conducting dedicated FRB searches has dramatically revolutionised the field: hundreds of new…

High Energy Astrophysical Phenomena · Physics 2024-12-03 Inés Pastor-Marazuela

Recently, about five hundred fast radio bursts (FRBs) detected by CHIME/FRB Project have been reported. The vast amounts of data would make FRBs a promising low-redshift cosmological probe in the forthcoming years, and thus the issue of how…

Cosmology and Nongalactic Astrophysics · Physics 2022-02-04 Xing-Wei Qiu , Ze-Wei Zhao , Ling-Feng Wang , Jing-Fei Zhang , Xin Zhang

Fast radio bursts (FRBs) are transient radio sources at cosmological distances. No counterparts in other bands have been observed for { non-repeating FRBs}. Here we suggest the collapse of strange star crusts as a possible origin for FRBs.…

High Energy Astrophysical Phenomena · Physics 2018-05-15 Yue Zhang , Jin-Jun Geng , Yong-Feng Huang

The origins of fast radio bursts (FRBs), astronomical transients with millisecond timescales, remain unknown. One of the difficulties stems from the possibility that observed FRBs could be heterogeneous in origin; as some of them have been…

High Energy Astrophysical Phenomena · Physics 2021-10-20 Bo Han Chen , Tetsuya Hashimoto , Tomotsugu Goto , Seong Jin Kim , Daryl Joe D. Santos , Alvina Y. L. On , Ting-Yi Lu , Tiger Y. -Y. Hsiao

We present the results of a pilot study search for Fast Radio Bursts (FRBs) using the Murchison Widefield Array (MWA) at low frequencies (139 - 170 MHz). We utilised MWA data obtained in a routine imaging mode from observations where the…

Fast Radio Bursts (FRBs) are short-duration radio transients that occur at random times in host galaxies distributed all over the sky. Large field of view instruments can play a critical role in the blind search for rare FRBs. We present a…

Instrumentation and Methods for Astrophysics · Physics 2024-11-04 R. Luo , R. D. Ekers , G. Hobbs , A. Dunning , C. W. James , M. E. Lower , V. Gupta , A. Zic , M. Sokolowski , C. Phillips , A. T. Deller , L. Staveley-Smith

Estimating the all-sky rate of fast radio bursts (FRBs) has been difficult due to small-number statistics and the fact that they are seen by disparate surveys in different regions of the sky. In this paper we provide limits for the FRB rate…

High Energy Astrophysical Phenomena · Physics 2016-06-08 Liam Connor , Hsiu-Hsien Lin , Kiyoshi Masui , Niels Oppermann , Ue-Li Pen , Jeffrey B. Peterson , Alexander Roman , Jonathan Sievers

The paper presents algorithms to realize effectively and accurately the stepped-frequency waveform reflectometry (SFWR), i.e. the reflectometric technique based on the use of sinusoidal bursts. This technique is useful for monitoring the…

Signal Processing · Electrical Eng. & Systems 2020-02-19 Nicola Giaquinto , Marco Scarpetta , Maurizio Spadavecchia

Fast radio bursts (FRBs) are enigmatic high-energy events with unknown origins, which are observationally divided into two categories, i.e., repeaters and non-repeaters. However, there are potentially a number of non-repeaters that may be…

High Energy Astrophysical Phenomena · Physics 2025-02-14 Wan-Peng Sun , Ji-Guo Zhang , Yichao Li , Wan-Ting Hou , Fu-Wen Zhang , Jing-Fei Zhang , Xin Zhang

We propose that fast radio bursts (FRBs) can be used as the probes to constrain the possible anisotropic distribution of baryon matter in the Universe. Monte Carlo simulations show that, 400 (800) FRBs are enough to detect the anisotropy at…

Cosmology and Nongalactic Astrophysics · Physics 2021-11-29 Hai-Nan Lin , Yu Sang

Fast radio bursts (FRB) are millisecond-duration radio pulses with apparent extragalactic origins. All but two of the FRBs have been discovered using the Parkes dish which employs multiple beams formed by an array of feed horns on its focal…

High Energy Astrophysical Phenomena · Physics 2016-10-19 H. K. Vedantham , V. Ravi , G. Hallinan , R. Shannon

Nonuniform Fourier data are routinely collected in applications such as magnetic resonance imaging, synthetic aperture radar, and synthetic imaging in radio astronomy. To acquire a fast reconstruction that does not require an online inverse…

Numerical Analysis · Mathematics 2016-10-05 Anne Gelb , Guohui Song

The standing waves existed in radio telescope data are primarily due to reflections among the instruments, which significantly impact the spectrum quality of the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Eliminating…

Instrumentation and Methods for Astrophysics · Physics 2025-01-09 Chen Xu , Jie Wang , Yingjie Jing , Fujia Li , Hengqian Gan , Ziming Liu , Tiantian Liang , Qingze Chen , Zerui Liu , Zhipeng Hou , Hao Hu , Huijie Hu , Shijie Huang , Peng Jiang , Chuan-Peng Zhang , Yan Zhu

Fast Radio Bursts (FRBs), like pulsars, display radio emission from compact regions such that they can be treated as point sources. As this radiation propagates through space, they encounter sources of lensing such as a gravitational field…

High Energy Astrophysical Phenomena · Physics 2026-05-11 Zarif Kader , Matt Dobbs , Calvin Leung , Kiyoshi W. Masui , Mawson W. Sammons
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