Seminars

We organize various seminars on recent advances in quantum field theories and string theory. These seminars are in Japanese.


Recent Seminars

2021/9/9 (Thu) 9:00 --

Speaker: Tomoki Nosaka (SISSA)

Title: M2-branes and discrete Painleve systems

Abstract:
It is known that the generating function of the partition function of the ABJM theory, the 3d Chern-Simons matter theory on N M2-branes probing C^4/Z_k orbifold background, enjoys a non-linear difference relation called the q-deformed Painleve III equation. We found that a similar relation holds also when the theory is deformed by the mass terms of the matter fields. The mass deformed ABJM theory is conjectured to exhibit a large N phase transition where the standard large N expansion formula for the massless case breaks down. The q-difference relation we found might be a useful tool to approach the phase transition in the future research.

Based on the idea of Painleve/gauge correspondence and the conjectured relation between the five dimensional Yang-Mills theories and the quantization of algebraic curves, it is further suggested that the same non-linear relation is also enjoyed by the theories of M2-branes placed on more general backgrounds. As an example I will also comment on the relation between the four node circular quiver Chern-Simons matter theory and the q-deformed Painleve VI equations.


2021/8/5 (Thu) 10:00 --

Speaker: Nobuchika Okada (Alabama U.)

Title: Non-Local extension of the Standard Model

Abstract:
In this talk, I will discuss a non-local extension of quantum field theory with an infinite series of derivatives in the kinetic terms of the fields. I will show that this modification provides us withinteresting phenomenology once applied to the Standard Model of particle physics.


2021/7/1 (Thu) 10:00 --

Speaker: Toshifumi Noumi

Title: Swampland conjectures and gravitational positivity

Abstract:
The goal of the Swampland program is to identify consistency conditions for a gravitational effective theory to have a consistent UV completion and clarify their phenomenological implications toward quantum gravity phenomenology. In the first half of the talk, I will provide an introduction to the Swampland program, especially focusing on the so-called Weak Gravity Conjecture. In the latter half, I will introduce our recent attempts toward its derivation based on consistency of scattering amplitudes.



You can see [Japanese Website] for more on the recent seminars.