## Joint Seminar

NITEP holds joint seminars with the OCU Research Group for Mathematical Physics and with the Particle Theory Laboratory.

Monopole bubbling and BPS 't Hooft operators in three, four, and five dimensions indico link

タイトル：Monopole bubbling and BPS 't Hooft operators in three, four, and five dimensions

アブストラクト： We evaluate the vacuum expectation values of half-BPS 't Hooft operators in supersymmetric gauge theories with eight supercharges in three, four, and five dimensions in terms of supersymmetric localization.
In localization formulas, there exist non-perturbative contributions from the moduli of Dirac monopoles screened by 't Hooft-Polyakov monopoles, called monopole bubbling effects (a.k.a. monopole screening effects). By introducing orientifolds, we generalize the brane construction of monopole bubbling effects for SU(N) gauge theories to SO(N) and USp(N) gauge theories.

Constructing Massive Scattering Amplitudes for Electroweak Effective Field Theory indico link

日時：2021年10月29日(金)　午前10時

タイトル：Constructing Massive Scattering Amplitudes for Electroweak Effective Field Theory

アブストラクト： Usual calculation for quantum field theory relies on Lagrangian under a certain symmetry. Then, one can obtain amplitudes by taking Feynman rules and diagrams. In contrast, a method called ''scattering amplitudes'' (also called on-shell
amplitudes, modern amplitude method, or spinor-helicity formalism) directly provides the amplitudes from symmetries without relying on Lagrangian. For example, calculations of gluon n-point scattering amplitudes can be greatly reduced in
this method. This approach is expected to extract some essences in quantum field theory, which are not obvious in the usual Feynman methods. Basically, conventional scattering amplitudes are methods for the massless theory. From 2017,
this method has been generalized to involve any-spin massive particles by Nima Arkani-Hamed group. In this talk, first, I will provide a brief review of the massless and massive scattering amplitudes. Next, I will introduce the scattering amplitude
calculations connected with electroweak symmetry breaking, which are related to masses, vev, and longitudinal waves. In particular, we do not use the standard model Lagrangian. We derived (strictly speaking, we re-derived) several equations
for electroweak symmetry breaking that are supposed to be inherent in field theory. Also, in such a bottom-up approach, we present the systematic derivation of independent three-point and four-point contact terms. This talk is based on arXiv:1909.10551 and arXiv:2008.09652.

M2-branes and discrete Painleve systems indico link

タイトル：M2-branes and discrete Painleve systems

アブストラクト：
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.

Non-Local extension of the Standard Model indico link

日時：2021年8月5日(木)　午前10時

タイトル：Non-Local extension of the Standard Model

アブストラクト：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.

Swampland conjectures and gravitational positivity indico link

タイトル：Swampland conjectures and gravitational positivity

アブストラクト：
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.

Peculiar relations between Argyres-Douglas theories and Lagrangian theories indico link

日時 : 2021年5月13日(木) 10:00～

の新しい関係について、超共形指数とネクラソフ分配関数の観点から議論する。

Modeling evolution of dark matter substructure and annihilation boost indico link

Matrix-valued higher spin holography indico link

Catalytic Creation of Baby Bubble Universe with Small Positive Cosmological Constant indico link

Finite N corrections to the superconformal index from D3-brane analysis in AdS5/CFT4 indico link

In the context of the AdS/CFT, the Type IIB superstring theory on $AdS_5 \times SE_5$ corresponds to an $\mathcal{N}=1$ quiver gauge theory, where $SE_5$ is a five-dimensional Sasaki-Einstein manifold. We study this correspondence by using the superconformal index, which contains the information of the BPS spectrum in the theory. It is known that the index of the large $N$ limit is evaluated by the Kaluza-Klein modes on $SE_5$ and the agreement with CFT results was confirmed in many examples. In this talk, we consider the finite $N$ corrections to the index on the AdS side as a next step. To do this, we focus on a single D3-brane wrapped around a three-cycle on $SE_5$. Because there are in general several three-cycles on $SE_5$, we need to sum up contributions of these single D3-branes. By using the D3-brane analysis, we propose a prescription to calculate the finite $N$ corrections to the index on the AdS side. We explain our prescription through some examples and see the agreement with the CFT results calculated by the localization method.

Dark Matter Signals on a Laser Interferometer indico link

Lepton-flavor violation via four-Fermi contact interactions at e+e- linear collider indico link

How to "cool down" Ising model on 2d dynamical triangulations indico link

Search for charged lepton flavor violation using nucleus indico link