Fast Radio Bursts (FRBs) are short astrophysical transients of extragalactic origin. Their burst signal is dispersed by the free electrons in the large-scale-structure (LSS), leading to delayed arrival times at different frequencies. Another potential source of time delay is the well known Shapiro delay, which measures the space-space and time-time metric perturbations along the line-of-sight. If photons of different frequencies follow different trajectories, i.e. if the universality of free fall guaranteed by the weak equivalence principle (WEP) is violated, they would experience an additional relative delay. This quantity, however, is not an observable on the background level as it is not gauge independent, which has led to confusion in previous papers. Instead, an imprint can be seen in the correlation between the time delays of different pulses. In this paper, we derive robust and consistent constraints from twelve localised FRBs on the violation of the WEP in the energy range between 4.6 and 6 meV. In contrast to a number of previous studies, we consider our signal to be not in the model, but in the covariance matrix of the likelihood. To do so, we calculate the covariance of the time delays induced by the free electrons in the LSS, the WEP breaking terms, the Milky Way and host galaxy. By marginalising over both host galaxy contribution and the contribution from the free electrons, we find that the parametrised post-Newtonian parameter $γ$ characterising the WEP violation must be constant in this energy range to 1 in $10^{13}$ at 68$\;\%$ confidence. These are the tightest constraints to-date on $Δγ$ in this low energy range.
Search for persistent radio emission towards selected localised Fast Radio Burst positions using the MeerKAT Telescope
North-West University（西北大学）；National Institute for Theoretical and Computational Sciences (NITheCS)（国家理论与计算科学研究所）；University of South Africa（南非大学）；University of Nigeria（尼日利亚大学）；SKA Observatory（平方公里阵列射电望远镜天文台）
Probing the Cosmic Web with Fast Radio Bursts. I. Scattering
Racah Institute of Physics, The Hebrew University（拉卡物理研究所，希伯来大学）；Astrophysics Research Center of the Open University (ARCO), The Open University of Israel（开放大学天体物理研究中心（ARCO），以色列开放大学）；Department of Natural Sciences, The Open University of Israel（自然科学系，以色列开放大学）；Department of Physics, The George Washington University（物理系，乔治华盛顿大学）；Department of Physics, University of California, Santa Barbara（物理系，加州大学圣塔芭芭拉分校）
A first measurement of baryonic feedback with Fast Radio Bursts
Argelander-Institut für Astronomie, Universität Bonn（波恩大学天体物理研究所）；Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians Universität München（慕尼黑大学物理学院天文台）；Excellence Cluster ORIGINS（ORIGINS卓越集群）
A stochastic forward model for the intergalactic dispersion-measure distribution of Fast Radio Bursts
University of Cape Town（开普敦大学）；African Institute for Mathematical Sciences（非洲数学科学研究所）；National Institute for Theoretical and Computational Sciences (NITheCS)（国家理论与计算科学研究所）；Universidade Federal de Ouro Preto（欧罗普雷图联邦大学）；INAF – Osservatorio Astronomico di Trieste（意大利国家天体物理研究所的里雅斯特天文台）；IFPU – Institute for Fundamental Physics of the Universe（宇宙基础物理研究所）；Universidade Federal do Espírito Santo（圣埃斯皮里图联邦大学）
The University of Sydney（悉尼大学）；University of Cape Town（开普敦大学）；African Institute for Mathematical Sciences（非洲数学科学研究所）；Curtin University（科廷大学）；Swinburne University of Technology（斯威本科技大学）；ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)（引力波发现卓越研究中心（OzGrav））；Stanford University（斯坦福大学）；Trinity College Dublin（都柏林圣三一学院）；Stellenbosch University（斯坦伦布什大学）；Aix-Marseille University（艾克斯-马赛大学）；Australian National University（澳大利亚国立大学）；Indian Institute of Technology, Indore（印度理工学院印多尔分校）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；University of Chinese Academy of Sciences（中国科学院大学）
Cavendish experiment with fast radio bursts on cosmological scales
Tsung-Dao Lee Institute, Shanghai Jiao Tong University（上海交大李政道研究所）；School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院）；Key Laboratory for Particle Astrophysics and Cosmology (MOE)/Shanghai Key Laboratory for Particle Physics and Cosmology（粒子天体物理与宇宙学教育部重点实验室/上海粒子物理与宇宙学重点实验室）；State Key Laboratory of Dark Matter Physics（暗物质物理全国重点实验室）
Fast Radio Bursts in the Era of the Vera C. Rubin Observatory's Legacy Survey of Space and Time
International Centre for Radio Astronomy Research, Curtin University（国际无线电天文研究中心，科廷大学）；Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS)（南里奥格兰德联邦大学物理研究所）；Australia Telescope National Facility, CSIRO Space & Astronomy（澳大利亚望远镜国家设施，CSIRO空间与天文学部）；Sydney Institute for Astronomy, School of Physics, The University of Sydney（悉尼大学物理学院悉尼天体物理研究所）；Department of Physics, University of Washington（华盛顿大学物理系）；Centre for Astrophysics and Supercomputing, Swinburne University of Technology（斯威本科技大学天体物理学与超级计算中心）；Kavli IPMU (WPI), UTIAS, The University of Tokyo（东京大学宇宙起源研究核心理论中心（ Kavli IPMU））；School of Mathematical and Physical Sciences, Macquarie University（麦考瑞大学数理科学学院）；Department of Physics, University of Oxford（牛津大学物理系）
