Overview：
The first joint meeting among ISSP/IPMU/KEK theory groups.
The theme is “θ＝π” in field theories, and its relation to spin systems. There seems to be recent new understandings of physics at θ＝π by using new techniques in numerical computations in field theories. We start with the reviews of how the ground state at θ＝π in 2d field theories has been understood in the past and discuss its relation to 4d Yang-Mills theories. The recently proposed techniques to simulate θ＝π physics and their results will be presented.

Organizers: Ryuichiro Kitano, Norikazu Yamada, Masahito Yamazaki, and Masaki Oshikawa

Program：
13:00-13:20 Speaker: Masaki Oshikawa (ISSP)
Title: Mini introduction to the relation among spin systems, non-linear sigma models and the WZW model
13:20-13:50 Speaker: Masahito Yamazaki (Kavli IPMU)
Title : Relation between 4d SU(2) YM and 2d CP¹ model
13:50-14:20 Speaker: Norikazu Yamada (KEK)
Title: Gapped or gapless, case of 4d SU(2) YM at θ＝π
14:20-15:00 Break
15:00-16:00 Speaker: Katsumasa Nakayama (Riken)
Title : Gapped or gapless, case of 2d CP¹ at θ＝π
16:00-17:00 Discussion

Please access here for the registration in advance.
**Due to the capacity of the lecture room, we will limit the number of participants up to about “50“