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Search for Dark-Matter–Nucleon Interactions with a Dark Mediator in PandaX-4T

Physical Review Letters 2023年第19期131卷 191002-191002页

作者： Di Huang Abdusalam Abdukerim Zihao Bo Wei Chen Xun Chen Chen Cheng Zhaokan Cheng Xiangyi Cui Yingjie Fan Deqing Fang Changbo Fu Mengting Fu Lisheng Geng Karl Giboni Linhui Gu Xuyuan Guo Chencheng Han Ke Han Changda He Jinrong He Yanlin Huang Junting Huang Zhou Huang Ruquan Hou Yu Hou Xiangdong Ji Yonglin Ju Chenxiang Li Jiafu Li Mingchuan Li Shuaijie Li Tao Li Qing Lin Jianglai Liu Congcong Lu Xiaoying Lu Lingyin Luo Yunyang Luo Wenbo Ma Yugang Ma Yajun Mao Yue Meng Xuyang Ning Ningchun Qi Zhicheng Qian Xiangxiang Ren Nasir Shaheed Xiaofeng Shang Xiyuan Shao Guofang Shen Lin Si Wenliang Sun Andi Tan Yi Tao Anqing Wang Meng Wang Qiuhong Wang Shaobo Wang Siguang Wang Wei Wang Xiuli Wang Zhou Wang Yuehuan Wei Mengmeng Wu Weihao Wu Jingkai Xia Mengjiao Xiao Xiang Xiao Pengwei Xie Binbin Yan Xiyu Yan Jijun Yang Yong Yang Yukun Yao Chunxu Yu Ying Yuan Zhe Yuan Xinning Zeng Dan Zhang Minzhen Zhang Peng Zhang Shibo Zhang Shu Zhang Tao Zhang Wei Zhang Yang Zhang Yingxin Zhang Yuanyuan Zhang Li Zhao Qibin Zheng Jifang Zhou Ning Zhou Xiaopeng Zhou Yong Zhou Yubo Zhou Ran Huo Haibo Yu School of Physics and Astronomy Shanghai Jiao Tong University Key Laboratory for Particle Astrophysics and Cosmology (MoE) Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai 200240 China Shanghai Jiao Tong University Sichuan Research Institute Chengdu 610213 China School of Physics Sun Yat-Sen University Guangzhou 510275 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University Zhuhai 519082 China Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai 200240 China Department of Physics Yantai University Yantai 264005 China Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) Institute of Modern Physics Fudan University Shanghai 200433 China School of Physics Peking University Beijing 100871 China School of Physics Beihang University Beijing 102206 China International Research Center for Nuclei and Particles in the Cosmos and Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing 100191 China School of Physics and Microelectronics Zhengzhou University Zhengzhou Henan 450001 China Yalong River Hydropower Development Company Ltd. 288 Shuanglin Road Chengdu 610051 China School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology Shanghai 200093 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Physics University of Maryland College Park Maryland 20742 USA State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei 230026 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary Science Shandong University Qingdao 266237 Shandong China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong University Qingdao 266237 Shandong China Scho

We report results of a search for dark-matter–nucleon interactions via a dark mediator using optimized low-energy data from the PandaX-4T liquid xenon experiment. With the ionization-signal-only data and utilizing the Migdal effect, we set the most stringent limits on the cross section for dark matter masses ranging from 30 MeV/c2 to 2 GeV/c2. Under the assumption that the dark mediator is a dark photon that decays into scalar dark matter pairs in the early Universe, we rule out significant parameter space of such thermal relic dark-matter model.

关键词： Dark matter particle dark matter Hypothetical gauge bosons

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Exploring the secondary peaks of autocorrelation in black hole flare movies

arXiv

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arXiv 2025年

作者： Zhang, Zhenyu Hou, Yehui Guo, Minyong Mizuno, Yosuke Chen, Bin School of Physics Peking University No.5 Yiheyuan Rd Beijing100871 China School of physics and astronomy Beijing Normal University Beijing100875 China Beijing Normal University Beijing100875 China Tsung-Dao Lee Institute Shanghai Jiao-Tong University Shanghai201210 China School of Physics & Astronomy Shanghai Jiao-Tong University Shanghai200240 China Key Laboratory for Particle Physics Astrophysics and Cosmology Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai Jiao-Tong University Shanghai200240 China Institut für Theoretische Physik Goethe Universität Max-von-Laue-Str. 1 Frankfurt am Main60438 Germany Institute of Fundamental Physics and Quantum Technology School of Physical Science and Technology Ningbo University Zhejiang Ningbo315211 China Center for High Energy Physics Peking University No.5 Yiheyuan Rd Beijing100871 China

The strong gravitational field of a black hole bends light, forming multi-level images, yet extracting precise spacetime information from them remains challenging. In this study, we investigate how gravitational lensing leaves unique and detectable signatures in black hole movies using autocorrelation analysis. By examining the two-dimensional autocorrelation of a movie depicting a hotspot orbiting a Kerr black hole, as viewed by a near-axis observer, we identify a persistent secondary peak structure induced by gravitational lensing. Notably, these secondary peaks converge to a fixed point in the time-lag domain, largely independent of the hotspot’s orbital radius. This key property suggests that combining future black hole flare observations with advanced autocorrelation analysis could effectively disentangle lensing effects from orbital dynamics, enabling direct measurement of black hole parameters. Our findings establish autocorrelation as a powerful tool for probing spacetime geometry, offering new insights into gravitational physics through time-resolved black hole images. © 2025, CC BY.

关键词： Black holes

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The peculiar disk evolution of 4U 1630–472 observed by Insight-HXMT during the 2022 and 2023 outbursts

arXiv

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arXiv 2025年

作者： Peng, Jing-Qiang Zhang, Shu Shui, Qing-Cang Chen, Yu-Peng Zhang, Shuang-Nan Kong, Ling-Da Santangelo, A. Yu, Zhuo-Li Ji, Long Wang, Peng-Ju Chang, Zhi Li, Jian Li, Zhao-Sheng Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing100049 China Institute für Astronomie und Astrophysik Kepler Center for Astro and Particle Physics Eberhard Karls Universität Sand 1 TübingenD-72076 Germany School of Physics and Astronomy Sun Yat-Sen University Zhuhai519082 China CAS Key Laboratory for Research in Galaxies and Cosmology Department of Astronomy University of Science and Technology of China Hefei230026 China School of Astronomy and Space Science University of Science and Technology of China Hefei230026 China Key Laboratory of Stars and Interstellar Medium Xiangtan University Hunan Xiangtan411105 China

We study the spectral properties of the black hole X-ray transient binary 4U 1630–472 during the 2022 and 2023 outbursts with Insight-HXMT observations. We find that the outbursts are in peculiar soft states. The effect of the hardening factor on the disk temperature is taken into account by kerrbb, and the flux and temperature of the disk are found to follow F ∝ Teff3.92±0.13 and F ∝ Teff4.91±1.00, for the two outbursts respectively. The flux-temperature relation is roughly consistent with holding a standard disk, By fitting with the p-free model, the p-value is found to have anti-correlation with disk temperature. Combined a joint diagnostic in a diagram of the relation between the non-thermal fraction and luminosity, by enclosing as well the previous outbursts, reveals a possible pattern for the disk evolution toward a slim one, and such an evolution may depend on the fraction of the non-thermal emission in the high soft state. Copyright © 2025, The Authors. All rights reserved.

关键词： Black holes

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First measurement of the yield of He8 isotopes produced in liquid scintillator by cosmic-ray muons at Daya Bay

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Physical Review D 2024年第1期110卷 L011101-L011101页

作者： F. P. An W. D. Bai A. B. Balantekin M. Bishai S. Blyth G. F. Cao J. Cao J. F. Chang Y. Chang H. S. Chen H. Y. Chen S. M. Chen Y. Chen Y. X. Chen Z. Y. Chen J. Cheng Y.-C. Cheng Z. K. Cheng J. J. Cherwinka M. C. Chu J. P. Cummings O. Dalager F. S. Deng X. Y. Ding Y. Y. Ding M. V. Diwan T. Dohnal D. Dolzhikov J. Dove H. Y. Duyang D. A. Dwyer J. P. Gallo M. Gonchar G. H. Gong H. Gong W. Q. Gu J. Y. Guo L. Guo X. H. Guo Y. H. Guo Z. Guo R. W. Hackenburg H. C. Han Y. Han S. Hans M. He K. M. Heeger Y. K. Heng Y. K. Hor Y. B. Hsiung B. Z. Hu J. R. Hu T. Hu Z. J. Hu H. X. Huang J. H. Huang X. T. Huang Y. B. Huang P. Huber D. E. Jaffe K. L. Jen X. L. Ji X. P. Ji R. A. Johnson D. Jones L. Kang S. H. Kettell S. Kohn M. Kramer T. J. Langford J. Lee J. H. C. Lee R. T. Lei R. Leitner J. K. C. Leung F. Li H. L. Li J. J. Li Q. J. Li R. H. Li S. Li S. C. Li W. D. Li X. N. Li X. Q. Li Y. F. Li Z. B. Li H. Liang C. J. Lin G. L. Lin S. Lin J. J. Ling J. M. Link L. Littenberg B. R. Littlejohn J. C. Liu J. L. Liu J. X. Liu C. Lu H. Q. Lu K. B. Luk B. Z. Ma X. B. Ma X. Y. Ma Y. Q. Ma R. C. Mandujano C. Marshall K. T. McDonald R. D. McKeown Y. Meng J. Napolitano D. Naumov E. Naumova T. M. T. Nguyen J. P. Ochoa-Ricoux A. Olshevskiy J. Park S. Patton J. C. Peng C. S. J. Pun F. Z. Qi M. Qi X. Qian N. Raper J. Ren C. Morales Reveco R. Rosero B. Roskovec X. C. Ruan B. Russell H. Steiner J. L. Sun T. Tmej K. Treskov W.-H. Tse C. E. Tull Y. C. Tung B. Viren V. Vorobel C. H. Wang J. Wang M. Wang N. Y. Wang R. G. Wang W. Wang X. Wang Y. F. Wang Y. G. Wang Z. Wang Z. M. Wang H. Y. Wei L. H. Wei W. Wei L. J. Wen K. Whisnant C. G. White H. L. H. Wong E. Worcester D. R. Wu Q. Wu W. J. Wu D. M. Xia Z. Q. Xie Z. Z. Xing H. K. Xu J. L. Xu T. Xu T. Xue C. G. Yang L. Yang Y. Z. Yang H. F. Yao M. Ye M. Yeh B. L. Young H. Z. Yu Z. Y. Yu C. Z. Yuan B. B. Yue V. Zavadskyi S. Zeng Y. Zeng L. Zhan C. Zhang F. Y. Zhang H. H. Zhang J. L. Zhang J. W. Zhang Q. M. Zhang S. Q. Zhang X. T. Zhang Y. M. Zhang Y. X. Zhang Y. Y. Zhang Z. J. Zhang Z. P. Zhang Z. Y. Zhang Guangzhou China University of Wisconsin Madison Wisconsin 53706 USA Brookhaven National Laboratory Upton New York 11973 USA Department of Physics National Taiwan University Taipei Taiwan Institute of High Energy Physics Beijing China New Cornerstone Science Laboratory Institute of High Energy Physics Beijing China National United University Miao-Li Taiwan Department of Engineering Physics Tsinghua University Beijing China Shenzhen University Shenzhen China North China Electric Power University Beijing China Chinese University of Hong Kong Hong Kong China Siena College Loudonville New York 12211 USA Department of Physics and Astronomy University of California Irvine California 92697 USA University of Science and Technology of China Hefei China Shandong University Jinan China Charles University Faculty of Mathematics and Physics Prague Czech Republic Joint Institute for Nuclear Research Dubna Moscow Region Department of Physics University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics Illinois Institute of Technology Chicago Illinois 60616 USA Beijing Normal University Beijing China Department of Nuclear Science and Technology School of Energy and Power Engineering Xi’an Jiaotong University Xi’an China Wright Laboratory and Department of Physics Yale University New Haven Connecticut 06520 USA China Institute of Atomic Energy Beijing China Guangxi University No. 100 Daxue East Road Nanning China Center for Neutrino Physics Virginia Tech Blacksburg Virginia 24061 USA Institute of Physics National Chiao-Tung University Hsinchu Taiwan Department of Physics University of Cincinnati Cincinnati Ohio 45221 USA Department of Physics College of Science and Technology Temple University Philadelphia Pennsylvania 19122 USA Dongguan University of Technology Dongguan China Department of Physics University of California Berkeley California 94

Daya Bay presents the first measurement of cosmogenic He8 isotope production in liquid scintillator, using an innovative method for identifying cascade decays of He8 and its child isotope, Li8. We also measure the production yield of Li9 isotopes using well-established methodology. The results, in units of 10−8μ−1g−1 cm2, are 0.307±0.042, 0.341±0.040, and 0.546±0.076 for He8, and 6.73±0.73, 6.75±0.70, and 13.74±0.82 for Li9 at average muon energies of 63.9 GeV, 64.7 GeV, and 143.0 GeV, respectively. The measured production rate of He8 isotopes is more than an order of magnitude lower than any other measurement of cosmogenic isotope production. It replaces the results of previous attempts to determine the ratio of He8 to Li9 production that yielded a wide range of limits from 0% to 30%. The results provide future liquid-scintillator-based experiments with improved ability to predict cosmogenic backgrounds.

关键词： Neutrino oscillations Neutrino detection

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B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source

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Nuclear science and Techniques 2024年第8期35卷 1-11页

作者： Li, Qiang Wang, Li-Jiao Tang, Jing-Yu Qiu, Xiang-Biao Chen, Zhen Zhao, Mao-Yuan Ning, Chang-Jun Pan, Kai Xu, Wei Li, Tao Lu, Su-Peng Yi, Han Fan, Rui-Rui Feng, Chang-Qing Zhang, Rong Sun, Xiao-Yang An, Qi Bai, Hao-Fan Bai, Jiang-Bo Bao, Jie Cao, Ping Chen, Qi-Ping Chen, Yong-Hao Cui, Zeng-Qi Fan, An-Chuan Feng, Fan-Zhen Gu, Min-Hao Han, Chang-Cai Han, Zi-Jie He, Guo-Zhu He, Yong-Cheng Hong, Yang Hu, Yi-Wei Huang, Han-Xiong Jiang, Wei Jiang, Zhi-Jie Jin, Zheng-Yao Kang, Ling Li, Bo Li, Gong Li, Xiao Li, Yang Liu, Jie Liu, Rong Liu, Shu-Bin Liu, Yi-Na Luan, Guang-Yuan Ren, Jie Ren, Zhi-Zhou Ruan, Xi-Chao Song, Zhao-Hui Sun, Kang Tan, Zhi-Xin Tang, Sheng-Da Wang, Jin-Cheng Wang, Peng-Cheng Wang, Zhao-Hui Wen, Zhong-Wei Wu, Xiao-Guang Wu, Xuan Xia, Cong Yu, Yong-Ji Zhang, Guo-Hui Zhang, Hang-Chang Zhang, Lin-Hao Zhang, Qi-Wei Zhang, Xian-Peng Zhang, Yu-Liang Zhang, Yue Zhang, Zhi-Yong Zhou, Zhi-Hao Zhu, Ke-Jun Zou, Chong Institute of High Energy Physics Chinese Academy of Sciences (CAS) Beijing China Spallation Neutron Source Science Center Dongguan China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of Sciences Beijing China Dongguan Songshan Lake Future School Dongguan China School of Nuclear Science and Technology University of Science and Technology of China Hefei China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei China North Night Vision Science and Technology (Nanjing) Research Institute Co. Ltd Nanjing China Department of Modern Physics University of Science and Technology of China Hefei China State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing China Institute of Modern Physics Fudan University Shanghai China Key Laboratory of Nuclear Data China Institute of Atomic Energy Beijing China China Academy of Engineering Physics Institute of Nuclear Physics and Chemistry Mianyang China USTC archaeometry lab University of Science and Technology of China Hefei China Northwest Institute of Nuclear Technology Xi’an China University of Chinese Academy of Sciences Beijing China China Shipbuilding Trading Co. Ltd Beijing China

Neutron resonance imaging (NRI) has recently emerged as an appealing technique for neutron radiography. Its complexity surpasses that of conventional transmission imaging, as it requires a high demand for both a neutron source and detector. Consequently, the progression of NRI technology has been sluggish since its inception in the 1980s, particularly considering the limited studies analyzing the neutron energy range above keV. The white neutron source (Back-n) at the China Spallation Neutron Source (CSNS) provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to MeV. Neutron-sensitive microchannel plates (MCP) have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions, high detection efficiency, and low noise. In this study, we report the development of a $$^{10}$$ B-doped MCP detector, along with its associated electronics, data processing system, and NRI experiments at the Back-n. Individual heavy elements such as gold, silver, tungsten, and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range; the more difficult medium-weight elements such as iron, copper, and aluminum with resonance peaks in the 1–100 keV energy range can also be identified. In particular, results in the neutron energy range of dozens of keV (Aluminum) are reported here for the first time.

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Records from the S-Matrix Marathon: A Timeless History of Time

arXiv

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arXiv 2024年

作者： Lee, Mang Hei Gordon Pajer, Enrico Giroux, Mathieu Hannesdottir, Holmfridur S. Mizera, Sebastian Pasiecznik, Celina Department of Applied Mathematics and Theoretical Physics University of Cambridge Wilberforce Road CambridgeCB3 0WA United Kingdom Leung Center for Cosmology and Particle Astrophysics National Taiwan University Taipei10617 Taiwan Department of Physics McGill University 3600 Rue University MontréalQCH3A 2T8 Canada Institute for Advanced Study PrincetonNJ08540 United States Department of Physics Princeton University PrincetonNJ08544 United States Princeton Center for Theoretical Science Princeton University PrincetonNJ08544 United States

By directly probing the initial conditions of our universe, cosmological surveys offer us a unique observational handle on quantum field theory in curved spacetime with dynamical gravity and might even allow us to glean information about a full theory of quantum gravity. Here we report on recent progress to study the natural observables in the problem, namely cosmological correlators. After setting the stage, we review results from three different approaches. First, we present the in-out formalism as an interesting alternative to the well-known in-in formalism and stress some of its advantages, such as the derivation of recursion relations, correlators cutting rules and a proposal for a de Sitter scattering matrix. Second, we tackle the important open problem of constructing effective theories in curved spacetime, which generally requires an open quantum system approach. Third, we provide an executive summary of general properties of the field-theoretic wavefunction that follow from symmetries, unitarity, causality and locality. We describe how these properties can be leveraged to bootstrap all tree-level results and we discuss loop contributions. These notes are based on a series of lectures held during the S-Matrix Marathon workshop at the Institute for Advanced Study on 11-22 March 2024. Copyright © 2024, The Authors. All rights reserved.

关键词： cosmology

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Simultaneous Determination of Fragmentation Functions and Test on Momentum Sum Rule

arXiv

引用

arXiv 2024年

作者： Gao, Jun Liu, ChongYang Shen, XiaoMin Xing, Hongxi Zhao, Yuxiang INPAC Shanghai Key Laboratory for Particle Physics and Cosmology School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Shanghai200240 China Deutsches Elektronen-Synchrotron DESY Notkestr. 85 Hamburg22607 Germany Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Institute of Quantum Matter South China Normal University Guangzhou510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Guangdong Provincial Key Laboratory of Nuclear Science Southern Nuclear Science Computing Center South China Normal University Guangzhou510006 China Institute of Modern Physics Chinese Academy of Sciences Huizhou516000 China Institute of Modern Physics Chinese Academy of Sciences Gansu Lanzhou730000 China University of Chinese Academy of Sciences Beijing100049 China Institute of Particle Physics Central China Normal University Wuhan430079 China

We perform a simultaneous global analysis of hadron fragmentation functions (FFs) to various charged hadrons (π±, K± and p/p¯) at next-to-leading order in QCD. The world data include results from electron-positron single-inclusive annihilation, semi-inclusive deep inelastic scattering, as well as proton-proton collisions including jet fragmentation measurements for the first time which lead to strong constraints on the gluon fragmentations. By carefully selecting hadron kinematics to ensure the validity of QCD factorization and the convergence of perturbative calculations, we achieve a satisfying best fit with χ2/d.o.f.= 0.90. The total momentum of u, d quarks and gluon carried by light charged hadrons have been determined precisely, urging precision determinations of FFs to neutral hadrons for a test of fundamental sum rules in QCD fragmentation. © 2024, CC0.

关键词： Inelastic scattering

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Stringent Tests of Lorentz Invariance Violation from LHAASO Observations of GRB 221009A

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Physical Review Letters 2024年第7期133卷 071501-071501页

作者： Zhen Cao F. Aharonian Axikegu Y. X. Bai Y. W. Bao D. Bastieri X. J. Bi Y. J. Bi W. Bian A. V. Bukevich Q. Cao W. Y. Cao Zhe Cao J. Chang J. F. Chang A. M. Chen E. S. Chen H. X. Chen Liang Chen Lin Chen Long Chen M. J. Chen M. L. Chen Q. H. Chen S. Chen S. H. Chen S. Z. Chen T. L. Chen Y. Chen N. Cheng Y. D. Cheng M. Y. Cui S. W. Cui X. H. Cui Y. D. Cui B. Z. Dai H. L. Dai Z. G. Dai Danzengluobu X. Q. Dong K. K. Duan J. H. Fan Y. Z. Fan J. Fang J. H. Fang K. Fang C. F. Feng H. Feng L. Feng S. H. Feng X. T. Feng Y. Feng Y. L. Feng S. Gabici B. Gao C. D. Gao Q. Gao W. Gao W. K. Gao M. M. Ge L. S. Geng G. Giacinti G. H. Gong Q. B. Gou M. H. Gu F. L. Guo X. L. Guo Y. Q. Guo Y. Y. Guo Y. A. Han M. Hasan H. H. He H. N. He J. Y. He Y. He Y. K. Hor B. W. Hou C. Hou X. Hou H. B. Hu Q. Hu S. C. Hu D. H. Huang T. Q. Huang W. J. Huang X. T. Huang X. Y. Huang Y. Huang X. L. Ji H. Y. Jia K. Jia K. Jiang X. W. Jiang Z. J. Jiang M. Jin M. M. Kang I. Karpikov D. Kuleshov K. Kurinov B. B. Li C. M. Li Cheng Li Cong Li D. Li F. Li H. B. Li H. C. Li Jian Li Jie Li K. Li S. D. Li W. L. Li X. R. Li Xin Li Y. Z. Li Zhe Li Zhuo Li E. W. Liang Y. F. Liang S. J. Lin B. Liu C. Liu D. Liu D. B. Liu H. Liu H. D. Liu J. Liu J. L. Liu M. Y. Liu R. Y. Liu S. M. Liu W. Liu Y. Liu Y. N. Liu Q. Luo Y. Luo H. K. Lv B. Q. Ma L. L. Ma X. H. Ma J. R. Mao Z. Min W. Mitthumsiri H. J. Mu Y. C. Nan A. Neronov L. J. Ou P. Pattarakijwanich Z. Y. Pei J. C. Qi M. Y. Qi B. Q. Qiao J. J. Qin A. Raza D. Ruffolo A. Sáiz M. Saeed D. Semikoz L. Shao O. Shchegolev X. D. Sheng F. W. Shu H. C. Song Yu. V. Stenkin V. Stepanov Y. Su D. X. Sun Q. N. Sun X. N. Sun Z. B. Sun J. Takata P. H. T. Tam Q. W. Tang R. Tang Z. B. Tang W. W. Tian C. Wang C. B. Wang G. W. Wang H. G. Wang H. H. Wang J. C. Wang Kai Wang L. P. Wang L. Y. Wang P. H. Wang R. Wang W. Wang X. G. Wang X. Y. Wang Y. Wang Y. D. Wang Y. J. Wang Z. H. Wang Z. X. Wang Zhen Wang Zheng Wang D. M. Wei J. J. Wei Y. J. Wei T. Wen C. Y. Wu H. R. Wu Q. W. Wu S. Wu X. F. Wu Y. S. Wu S. Q. Xi J. Xia G. M. Xiang D. X. Xiao Key Laboratory of Particle Astrophysics and Experimental Physics Division and Computing Center Institute of High Energy Physics Chinese Academy of Sciences 100049 Beijing China University of Chinese Academy of Sciences 100049 Beijing China Tianfu Cosmic Ray Research Center 610000 Chengdu Sichuan China Dublin Institute for Advanced Studies 31 Fitzwilliam Place 2 Dublin Ireland Max-Planck-Institut for Nuclear Physics P.O. Box 103980 69029 Heidelberg Germany School of Physical Science and Technology and School of Information Science and Technology Southwest Jiaotong University 610031 Chengdu Sichuan China School of Astronomy and Space Science Nanjing University 210023 Nanjing Jiangsu China Center for Astrophysics Guangzhou University 510006 Guangzhou Guangdong China Tsung-Dao Lee Institute and School of Physics and Astronomy Shanghai Jiao Tong University 200240 Shanghai China Institute for Nuclear Research of Russian Academy of Sciences 117312 Moscow Russia Hebei Normal University 050024 Shijiazhuang Hebei China University of Science and Technology of China 230026 Hefei Anhui China State Key Laboratory of Particle Detection and Electronics China Key Laboratory of Dark Matter and Space Astronomy and Key Laboratory of Radio Astronomy Research Center for Astronomical Computing Zhejiang Laboratory 311121 Hangzhou Zhejiang China Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences 200030 Shanghai China School of Physics and Astronomy Yunnan University 650091 Kunming Yunnan China Key Laboratory of Cosmic Rays (Tibet University) Ministry of Education 850000 Lhasa Tibet China National Astronomical Observatories Chinese Academy of Sciences 100101 Beijing China School of Physics and Astronomy (Zhuhai) and School of Physics (Guangzhou) and Sino-French Institute of Nuclear Engineering and Technology (Zhuhai) Sun Yat-sen University 519000 Zhuhai and 510275 Guangzhou Guangdong China Institute of Frontier a

On 9 October 2022, the Large High Altitude Air Shower Observatory (LHAASO) reported the observation of the very early TeV afterglow of the brightest-of-all-time gamma-ray burst 221009A, recording the highest photon statistics in the TeV band ever obtained from a gamma-ray burst. We use this unique observation to place stringent constraints on the energy dependence of the speed of light in vacuum, a manifestation of Lorentz invariance violation (LIV) predicted by some quantum gravity (QG) theories. Our results show that the 95% confidence level lower limits on the QG energy scales are EQG,1>10 times the Planck energy EPl for the linear LIV effect, and EQG,2>6×10−8EPl for the quadratic LIV effect. Our limits on the quadratic LIV case improve previous best bounds by factors of 5–7.

关键词： Gamma ray bursts Gravitation Quantum gravity

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A Search for Solar Axions and Anomalous Neutrino Magnetic Moment with the Complete Panda X-Ⅱ data

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Chinese physics Letters 2021年第1期38卷 30-34页

作者： Xiaopeng Zhou Xinning Zeng Xuyang Ning Abdusalam Abdukerim Wei Chen Xun Chen Yunhua Chen Chen Cheng Xiangyi Cui Yingjie Fan Deqing Fang Changbo Fu Mengting Fu Lisheng Geng Karl Giboni Linhui Gu Xuyuan Guo Ke Han Changda He Di Huang Yan Huang Yanlin Huang Zhou Huang Xiangdong Ji Yonglin Ju Shuaijie Li Huaxuan Liu Jianglai Liu Xiaoying Lu Wenbo Ma Yugang Ma Yajun Mao Yue Meng Kaixiang Ni Jinhua Ning Xiangxiang Ren Changsong Shang Guofang Shen Lin Si Andi Tan Anqing Wang Hongwei Wang Meng Wang Qiuhong Wang Siguang Wang Wei Wang Xiuli Wang Zhou Wang Mengmeng Wu Shiyong Wu Weihao Wu Jingkai Xia Mengjiao Xiao Pengwei Xie Binbin Yan Jijun Yang Yong Yang Chunxu Yu Jumin Yuan Ying Yuan Dan Zhang Tao Zhang Li Zhao Qibin Zheng Jifang Zhou Ning Zhou INPAC School of Physics and AstronomyShanghai Jiao Tong Universityand Shanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China School of Physics Beihang UniversityBeijing 100191China Shanghai Jiao Tong University Sichuan Research Institute Chengdu 610213China Yalong River Hydropower Development Company Ltd.288 Shuanglin RoadChengdu 610051China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China School of Physics Nankai UniversityTianjin 300071China Key Laboratory of Nuclear Physics and Ion-Beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Physics Peking UniversityBeijing 100871China International Research Center for Nuclei and Particles in the Cosmos&Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 100191China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Physics University of MarylandCollege ParkMaryland 20742USA School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE) Shandong UniversityJinan 250100China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Center for High Energy Physics Peking UniversityBeijing 100871China

We report a search for new physics signals using the low energy electron recoil events in the complete data set from PandaX-Ⅱ,in light of the recent event excess reported by XENON1 *** data correspond to a total exposure of 100.7 ton·day with liquid *** robust estimates of the dominant background spectra,we perform sensitive searches on solar axions and neutrinos with enhanced magnetic *** is found that the axionelectron coupling gAe<4.6×10^(-12) for an axion mass less than 0.1 keV/c^(2) and the neutrino magnetic moment μv<4.9×10^(-11)μB at 90%confidence *** observed excess from XENON1 T is within our experimental constraints.

关键词： moment. excess estimates

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One-loop thermal radiation exchange in gravitational wave power spectrum

arXiv

引用

arXiv 2023年

作者： Ota, Atsuhisa Sasaki, Misao Wang, Yi Department of Physics Chongqing Key Laboratory for Strongly Coupled Physics Chongqing University Chongqing401331 China University of Tokyo Chiba277-8583 Japan Center for Gravitational Physics and Quantum Information Yukawa Institute for Theoretical Physics Kyoto University Kyoto606-8502 Japan Leung Center for Cosmology and Particle Astrophysics National Taiwan University Taipei10617 Taiwan Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Hong Kong Hong Kong HKUST Jockey Club Institute for Advanced Study The Hong Kong University of Science and Technology Clear Water Bay Hong Kong Hong Kong

The radiation-dominated universe is a key ingredient of the standard Big Bang cosmology. Radiation comprises numerous quantum elementary particles, and the macroscopic behavior of radiation is described by taking the quantum thermal average of its constituents. While the interactions between individual particles and gravitational waves are often neglected in this context, it raises the question of whether these elementary particles interact with gravitational waves in the framework of quantum field theory. To address this question, this paper aims to explore the quantum mechanical aspects of gravitational waves in a universe dominated by a massless scalar field, whose averaged energy-momentum tensor plays the role of background radiation. We establish the equivalence between the classical Einstein equation and the mean-field approximation of the Heisenberg equation in a local thermal state. Beyond the mean-field approximation, we analyze the quantum corrections to gravitational waves, particularly focusing on the thermal radiation loop corrections. Interestingly, we find the 1-loop correction surpasses the tree-level spectrum of primordial gravitational waves, which is O(α2) where α = Hinf./Mpl is the ratio of the inflationary Hubble parameter to the Planck mass. Then, to see if this result persists even if we take into account all the higher order loop corrections, the loop expansion is reorganized in the series expansion in α. We schematically discuss two-loop diagrams that may give O(α2) contributions. We leave explicit computations of these diagrams for future studies. Thus, although we cannot claim that the whole loop corrections exceed the tree-level spectrum at the moment, our findings highlight the significance of considering quantum effects when studying the interaction between radiation and gravitational waves in the cosmological context. Copyright © 2023, The Authors. All rights reserved.

关键词： Heat radiation

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