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Date: February 26th (Thursday) , 2026
Place: KEK Tsukuba campus, Kenkyu-Honkan Building 1F Kobayashi Hall
Place: KEK Tsukuba campus, Kenkyu-Honkan Building 1F Kobayashi Hall
This one-day workshop focuses on the latest results from the Dark Energy Spectroscopic Instrument (DESI) and their implications for cosmology. We aim to bring together researchers to discuss observational findings, theoretical interpretations, and connections to related surveys and probes. The program will also include introductory and pedagogical components intended for participants from outside the immediate DESI community and from neighboring fields. The meeting will provide a platform for exchanging ideas and fostering new collaborations within the community.
Program
Program
10:30 – 10:40 Opening remark by IPNS director
Chair: Kazuyuki Akitsu
10:40 – 11:40 DESI data analysis and interpretation
Speaker: Shi-Fan Chen (Columbia University)
(Lunch break)
Chair: Ippei Obata
13:15 – 14:15 DESI implications on the model of the Universe
Speaker: Shinji Tsujikawa (Waseda University)
14:15 – 15:15 Related physics 1: Application of AI/ML to Large Scale Structure
Speaker: Takahiro Nishimichi (Kyoto Sangyo University)
(Pre-Seminar Tea Time)
Chair: Yuko Urakawa
15:45 – 16:45 (IPNS Seminar) Related physics 2: Subaru Prime Focus Spectrograph
Speaker: Masahiro Takada (Kavli IPMU)
Abstract: The instrument, the Prime Focus Spectrograph (PFS) is one of the flagships, next-generation instruments on the 8.2m Subaru Telescope, at 4,200m summit of Maunakea in Hawaii. Taking advantage of the ultrawide field of view of the Subaru Telescope, approximately 1.3 degrees in diameter at the prime focus, and large light-gathering power, the PFS will position 2,400 fibers to collect light from celestial objects and simultaneously obtain spectra across the entire visible light range and part of the near-infrared band. This highly ambitious instrument dramatically enhances the Subaru Telescope’s spectroscopic observation efficiency. The international PFS collaboration team is conducting large-area survey programs over the next five years, utilizing a total of 360 nights of telescope time. By creating a three-dimensional map of the universe and studying its evolution over cosmic time, the team aims to uncover the nature of dark energy, which drives the accelerated expansion of the universe. In this talk, I would like to introduce the PFS project.
17:00 - Discussion
Registration: closed
Registration: closed
Travel support will be provided upon request; however, we may not be able to accommodate all applications.
If you wish to apply for travel support, please complete your registration by February 5th → 8th→closed.
Registration deadline: February 19th
Participants:
Participants:
Organizers:
Kazuyuki Akitsu (IPNS), Yuji Chinone (QUP), Masaya Hasegawa (IPNS/QUP), Ippei Obata (IPNS), Naohito Saito (IPNS), Yuko Urakawa (IPNS)
This workshop is co-hosted by KEK Institute of Particle and Nuclear Studies (IPNS) and QUP.
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