Article
Astronomy & Astrophysics
Eleni Tsaprazi, Nhat-Minh Nguyen, Jens Jasche, Fabian Schmidt, Guilhem Lavaux
Summary: In this study, constraints on the linear alignment model were provided using a fully Bayesian field-level approach, and 4 sigma evidence of intrinsic alignment was found.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Multidisciplinary
Barun Kumar Pal
Summary: We investigate the prospects and consequences of spectral level reconstruction of primordial B-mode power by solving linear equations. The reconstruction technique proves to be useful in estimating the amplitude of primordial gravity waves and the tensor-to-scalar ratio. Accurate reconstruction of the intrinsic B-mode power up to a few hundred multipoles is achieved, providing sufficient information for estimating the tensor-to-scalar ratio.
PRAMANA-JOURNAL OF PHYSICS
(2023)
Article
Astronomy & Astrophysics
L. F. Secco, M. Jarvis, B. Jain, C. Chang, M. Gatti, J. Frieman, S. Adhikari, A. Alarcon, A. Amon, K. Bechtol, M. R. Becker, G. M. Bernstein, J. Blazek, A. Campos, A. Carnero Rosell, M. Carrasco Kind, A. Choi, J. Cordero, J. DeRose, S. Dodelson, C. Doux, A. Drlica-Wagner, S. Everett, G. Giannini, D. Gruen, R. A. Gruendl, I Harrison, W. G. Hartley, K. Herner, E. Krause, N. MacCrann, J. McCullough, J. Myles, A. Navarro-Alsina, J. Prat, R. P. Rollins, S. Samuroff, C. Sanchez, I Sevilla-Noarbe, E. Sheldon, M. A. Troxel, D. Zeurcher, M. Aguena, F. Andrade-Oliveira, J. Annis, D. Bacon, E. Bertin, S. Bocquet, D. Brooks, D. L. Burke, J. Carretero, F. J. Castander, M. Crocce, L. N. da Costa, M. E. S. Pereira, J. De Vicente, H. T. Diehl, P. Doel, K. Eckert, I Ferrero, B. Flaugher, D. Friedel, J. Garcia-Bellido, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. Huterer, K. Kuehn, N. Kuropatkin, M. A. G. Maia, J. L. Marshall, F. Menanteau, R. Miquel, J. J. Mohr, R. Morgan, J. Muir, F. Paz-Chinchon, A. Pieres, A. A. Plazas Malagon, M. Rodriguez-Monroy, A. Roodman, E. Sanchez, S. Serrano, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, C. To, J. Weller
Summary: We present high signal-to-noise measurements of three-point shear correlations and the third moment of the mass aperture statistic using the first 3 years of data from the Dark Energy Survey. We additionally obtain the first measurements of the configuration and scale dependence of the four three-point shear correlations which carry cosmological information. The results indicate promise for including these measurements in future cosmological analyses, and validate that the measured signals are likely to be of astrophysical and gravitational origin.
Article
Materials Science, Multidisciplinary
Chaofu Zhou, Feng Lin, Yongliang Tang, Yu Liu, Xin Luo, Yu Qi, Songzi Xu, Yunao Qiu, Hongzhen Yan, Xin Tong, Arup Neogi, Zhaoping Liu, Xufeng Zhou, Chong Wang, Jiming Bao, Zhiming Wang
Summary: Graphene nanosheets (GNS) have been considered as excellent fillers in polymers for electromagnetic interference (EMI) shielding composites. However, preparing well-dispersed and highly aligned GNS for optimal EMI shielding is still a challenge. We have developed a new technology that allows uniform alignment of GNS in polymer composites in any direction, and enables systematic tuning of the composites for optimal EMI performance.
MATERIALS TODAY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Tianyu Zhang, Xiangkun Liu, Chengliang Wei, Guoliang Li, Yu Luo, Xi Kang, Zuhui Fan
Summary: This paper investigates the effects of galaxy intrinsic alignment (IA) on weak lensing (WL) peak statistics through large simulations. The results show that IA mainly affects peak abundances in two aspects, including an additional contribution to the shape noise and an impact on peak signals from host clusters through satellite IA.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Jun-Sung Moon, Jounghun Lee
Summary: A numerical detection of the radius-dependent spin transition of dark matter halos is reported. The halo spin vectors in the high-mass section exhibit a transition from the Tweb intermediate to major principal axes as they are measured at more inner radii. This transition depends on the smoothing scale, R(f). Additionally, the vorticity vectors show a critical difference from the spins.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Pavel Motloch, Ue-Li Pen, Hao-Ran Yu
Summary: Using data from the Sloan Digital Sky Survey, the study examines the correlations between directions of galaxy angular momenta and various observables. They find a systematic effect consistent with galaxy orientation-dependent selection function, and hints of excess/deficit correlation for two observables. After correcting for redshift space distortions, the significance of these correlations decreases. No other systematic issues were found, but a thorough analysis beyond the scope of this work is needed.
Review
Astronomy & Astrophysics
Bin Shen, Mingyang Yu
Summary: Gravitational lensing is an important topic in astronomy with great application value. Its properties and research methods are closely related to the geometric and relativistic characteristics of the universe. This review focuses on the theoretical research and application of strong lenses and weak lenses. It introduces the basic principles of gravitational lensing and summarizes its wide range of applications in areas such as black holes, time delay, weak lensing, signal extraction, dark matter, and dark energy. Gravitational lensing plays a significant role in understanding the structure of galaxies and expanding our knowledge of the universe.
Article
Astronomy & Astrophysics
Jiaqi Wang, Xiaohu Yang, Jun Zhang, Hekun Li, Matthew Fong, Haojie Xu, Min He, Yizhou Gu, Wentao Luo, Fuyu Dong, Yirong Wang, Qingyang Li, Antonios Katsianis, Haoran Wang, Zhi Shen, Pedro Alonso Vaquero, Cong Liu, Yiqi Huang, Zhenjie Liu
Summary: Based on a large group/cluster catalog constructed from the DESI Legacy Imaging Surveys DR9, we measured and modeled the weak lensing signals of groups/clusters in several redshift bins. Our results provide measurements of the cumulative halo mass functions up to redshift z = 0.6 with high precision.
ASTROPHYSICAL JOURNAL
(2022)
