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Specially Appointed Assistant Professor    SHIRASAKI, Masato

Research Field

  • Large-scale Structures in the Universe

Degree

  • Ph.D. in physics, the University of Tokyo, 2015

Summary of Research

    The celestial objects we can observe, such as galaxies, are not randomly distributed on the celestial sphere; rather, they are known to exhibit a regular, web-like distribution. This distribution is called the large-scale structure of the universe, and many mysteries remain regarding its origin and evolution over time. The origin of the large-scale structure is related to the physical laws that governed the very early stages of the universe before the Big Bang. Furthermore, the time evolution of the large-scale structure is closely connected to the mysterious energy that accelerates the expansion of the universe (dark energy) and to dark matter, which is invisible yet accounts for most of the universe’s mass. My research goal is to combine multiple sets of observational data on large-scale structure and examine their statistical properties in detail, in order to uncover the physical laws of the primordial universe and the true nature of the dark components in the universe. To achieve this goal, I employ not only analytical methods but also numerical simulations and machine learning techniques.

Research Achievements or Papers

  • M. Shirasaki et al., “Noise reduction for weak lensing mass mapping: an application of generative adversarial networks to Subaru Hyper Suprime-Cam first-year data”, Monthly Notices of the Royal Astronomical Society, Volume 504, Issue 2, pp.1825-1839, 2021, https://doi.org/10.1093/mnras/stab982
  • M. Shirasaki et al., “Mock galaxy shape catalogues in the Subaru Hyper Suprime-Cam Survey”, Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 1, p.52-69, 2019, https://doi.org/10.1093/mnras/stz791
  • M. Shirasaki et al., “Robust covariance estimation of galaxy-galaxy weak lensing: validation and limitation of jackknife covariance”, Monthly Notices of the Royal Astronomical Society, Volume 470, Issue 3, p.3476-3496, 2017, https://doi.org/10.1093/mnras/stx1477
  • M. Shirasaki, S. Horiuchi, N. Yoshida, “Cross correlation of cosmic shear and extragalactic gamma-ray background: Constraints on the dark matter annihilation cross section”, Physical Review D, Volume 90, Issue 6, id.063502, 2014, https://doi.org/10.1103/PhysRevD.90.063502

Academic Society

  • Astronomical Society of Japan

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