2020/09/30 by Kazuhiro Kogai, Kazuyuki Akitsu, Fabian Schmidt +1
Physics and Astronomy · #Astronomy #Astrophysics #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #Galaxy #Inflation (cosmology) #Physics #Redshift #Spin (aerodynamics) #Universe #Weak gravitational lensing #astro-ph.CO #astro-ph.HE #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2021/03/060
published as JCAP03(2021)060 · 50 pages, 8 figures
openalex publication_date 2021/03/01 · arxiv created 2021/03/18 · arxiv updated 2021/03/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract Galaxy imaging surveys provide us with information on both the galaxy distribution and their shapes. In this paper, we systematically investigate the sensitivity of galaxy shapes to new physics in the initial conditions. For this purpose, we decompose the galaxy shape function into spin components, and compute the contributions to each spin component from both intrinsic alignment and weak lensing. We then consider the angular-dependent primordial non-Gaussianity, which is generated by a non-zero integer spin particle when active during inflation, and show that a galaxy imaging survey essentially functions as a spin-sensitive detector of such particles in the early universe. We also perform a forecast of the PNG generated from a higher spin particle, considering a Rubin Observatory LSST-like galaxy survey.