S
Sunao Sugiyama
Researcher at Institute for the Physics and Mathematics of the Universe
Publications - 19
Citations - 934
Sunao Sugiyama is an academic researcher from Institute for the Physics and Mathematics of the Universe. The author has contributed to research in topics: Gravitational microlensing & Dark matter. The author has an hindex of 6, co-authored 9 publications receiving 659 citations. Previous affiliations of Sunao Sugiyama include University of Tokyo.
Papers
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Journal ArticleDOI
Microlensing constraints on primordial black holes with Subaru/HSC Andromeda observations
Hiroko Niikura,Hiroko Niikura,Masahiro Takada,Naoki Yasuda,Robert H. Lupton,Takahiro Sumi,Surhud More,Surhud More,Toshiki Kurita,Toshiki Kurita,Sunao Sugiyama,Sunao Sugiyama,Anupreeta More,Anupreeta More,Masamune Oguri,Masamune Oguri,Masashi Chiba +16 more
TL;DR: In this paper, the abundance of primordial black holes in the Galactic halo is constrained through their microlensing of stars in M31, but only a single candidate event is found, providing stringent upper bounds on their abundance.
Journal ArticleDOI
Microlensing constraints on primordial black holes with the Subaru/HSC Andromeda observation
Hiroko Niikura,Masahiro Takada,Naoki Yasuda,Robert H. Lupton,Takahiro Sumi,Surhud More,Toshiki Kurita,Sunao Sugiyama,A. More,Masamune Oguri,Masashi Chiba +10 more
TL;DR: In this paper, the authors carried out a 7 hour-long observation of the Andromeda galaxy (M31) with the Subaru Hyper Suprime-Cam to search for microlensing of stars in M31 by primordial black holes lying in the halo regions of the Milky Way (MW) and M31.
Journal ArticleDOI
Exploring Primordial Black Holes from the Multiverse with Optical Telescopes.
Alexander Kusenko,Alexander Kusenko,Misao Sasaki,Misao Sasaki,Misao Sasaki,Sunao Sugiyama,Sunao Sugiyama,Masahiro Takada,Volodymyr Takhistov,Edoardo Vitagliano +9 more
TL;DR: It is demonstrated with numerical studies that future observations of HSC, as well as other optical surveys, will be able to provide a definitive test for this generic PBH formation mechanism if it is the dominant source of dark matter.
Journal ArticleDOI
Testing stochastic gravitational wave signals from primordial black holes with optical telescopes
Sunao Sugiyama,Sunao Sugiyama,Volodymyr Takhistov,Volodymyr Takhistov,Edoardo Vitagliano,Alexander Kusenko,Alexander Kusenko,Misao Sasaki,Misao Sasaki,Misao Sasaki,Masahiro Takada +10 more
TL;DR: In this article, the authors show that the broad mass function of a primordial black hole DM is already being probed by Subaru Hyper Suprime-Cam (HSC) microlensing data and is consistent with a detected candidate event.
Journal ArticleDOI
On the wave optics effect on primordial black hole constraints from optical microlensing search
TL;DR: In this paper, the authors examined the impact of wave effect on the primordial black hole (PBH) constraints obtained from the $r$-band (6210\AA) monitoring observation of M31 stars.