ISSP/IPMU/KEK informal meeting on "theta=pi"

Wednesday 25 Jan 2023, 13:00 → 18:00 Asia/Tokyo

Lecture room (ISSP)

The first joint meeting among ISSP/IPMU/KEK theory groups. The theme is "theta=pi" in field theories, and its relation to spin systems.

There seems to be recent new understandings of physics at theta=pi by using new techniques in numerical computations in field theories. We start with the reviews of how the ground state at theta=pi 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 theta=pi physics and their results will be presented.

Guest invited speaker: Katsumasa Nakayama (Riken)

** Due to the capacity of the lecture room, we will limit the number of participants up to about 50.

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

The meeting is supported by Kakenhi No.19H00689.

13:00 → 13:20 mini introduction to the relation among spin systems, non-linear sigma models and the WZW model

Speaker: Masaki Oshikawa (ISSP)

Oshikawa-theta_pi_review-ISSP-Jan2023.pdf

13:20 → 13:50 Relation between 4d SU(2) YM and 2d CP^1 model

Speaker: Masahito Yamazaki (Kavli IPMU)

20230125_4dYM_2dCPN.pdf

13:50 → 14:20 Gapped or gapless, case of 4d SU(2) YM at theta=pi

Speaker: Norikazu Yamada (KEK)

20230125-ISSP-IPMU-KEK-meeting_yamada.pdf

14:20 → 15:00 break

15:00 → 16:00 Gapped or gapless, case of 2d CP^1 at theta=pi

Speaker: Katsumasa Nakayama (Riken)

00_Tokyo_2023_0125_Kats Katsumasa NAKAYAMA.pdf

16:00 → 17:00 discussion