Constraints on anisotropic primordial non-Gaussianity from intrinsic alignments of SDSS-III BOSS galaxies

開始日時 2023/05/11 13:00
終了日時 2023/05/11 14:00
講演者 Dr. Toshiki Kurita (IPMU)
会場 Hybrid (On-site: 研究本館セミナールーム Online: Zoom)
連絡先 浦川 優子 /
言語 English


The current standard cosmological model, LambdaCDM model, predicts that the present-day cosmic large-scale structure (LSS) has formed as a result of a gravitational amplification of seed primordial fluctuations that were generated in the early universe such as inflationary scenario. The standard method to analyze LSS is based on the three-dimensional distribution of galaxies, inferred from their positions on the sky and redshifts. Here we show that “shapes” of galaxies, inferred from light (star) distribution in each galaxy, similarly originate from the primordial fluctuations in LSS formation — this phenomenon is called intrinsic alignments (IAs) of galaxy shapes. In this talk I will describe what the IA effect is, and show the actual measurement results from the SDSS-III BOSS datasets and the constraints on the anisotropic (quadrupolar) local primordial non-Gaussianity.