The 4^th KEK-NAOJ Joint Seminar at KAGRA+ToyamaU

[Program in English]

Precautions for entering the KAGRA mine

http://www2.yukawa.kyoto-u.ac.jp/~kazunori.kohri/Precautions4enteringKAGRAmine.html

Map of convenience stores

http://www2.yukawa.kyoto-u.ac.jp/~kazunori.kohri/ConbiniMap.pdf

Hotel JAL City Toyama Floor Guide

http://www2.yukawa.kyoto-u.ac.jp/~kazunori.kohri/JAL-City-Hotel.pdf

October 19, 2023

15:00 -- 15:30 Check-in at Hotel JAL City Toyama

15:30 Meet at the front of Hotel JAL City Toyama at the south exit of Toyama Station

15:30 -- 16:00 Heading to University of Toyama by a chartered bus

16:00 Arrive at University of Toyama, Gofuku Campus

16:00 -- 16:25 Preparation for the seminar

16:25 -- 18:00 SOKENDAI(NAOJ+KEK)- University of Toyama joint seminar

at Room A239 in Dept. of Phys., Faculty of Science

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16:25 -- 16:30 Welcome address (Dr. Mitsuru Kakizaki)

16:30 -- 16:45 Shuhei Ohzawa (Toyama U, Particle Physics Theory Group D1)

Title: Investigation of Extended Higgs Models

Abstract:

The Standard Model of particle physics has been established by the discovery of the Higgs boson in 2012.

However, the nature of the Higgs boson has not been determined in detail. Therefore, extended Higgs models with different Higgs potentials are proposed to explain phenomena beyond the Standard Model. In this presentation, we report on the discrimination of various extended Higgs models through the Higgs boson trilinear couplings at the 1-loop level. We discuss the discrimination of these Higgs models at future colliders such as the High-Luminosity LHC and the International Linear Collider at 1 TeV.

16:45 -- 17:00 Junpei Kato (Toyama U, Yamamoto Group 2^nd year (M2))

Title: Laser Intensity Stabilization System of KAGRA for O4

Abstract:

The gravitational wave telescope KAGRA is based on the Michelson interferometer and has Fabry-Perot cavities in both arms. The arrival of a gravitational wave causes a difference in the length of the two arms, which changes the amount of light received by the photodetector, thereby observing gravitational waves. Since the amplitude of gravitational waves is very small, it is necessary to remove various noise sources in order to detect them. One of the noise sources is laser intensity fluctuation, and we are developing a system to reduce this intensity fluctuation (laser intensity stabilization system). Intensity Stabilization system (ISS) is a control system in which a part of the light entering the interferometer is extracted as a voltage signal by a photodetector PD and fed back negatively to the acousto-optic elements through a filter using Servo circuit.

In this presentation, I will give an overview of the ISS and discuss the new optical system and results in O4a

17:00 -- 17:15 Shunsuke Sasaki (NAOJ, Sokendai 4^th year (D2))

Title: Developing "1D+" simulation of core-collapse supernovae

Abstract:

Core-collapse supernova(CCSN) explosion is an explosion that occurs when a massive star dies. Researches into simulations of CCSN mechanism have succeeded in showing that such explosions are possible even in three-dimensional (3D) simulations. Theoretical studies of supernova explosions are moving on to the next step. One of the several efforts is the development of 1D+ simulation that can reproduce 3D simulation. 1D+ is expected to be an important tool for promoting collaboration with other research fields. I am developing 1D+ simulation that reproduces 3D by introducing a phenomenological model of multidimensional turbulent effects. As a result, our 1D+ can mimic the evolution of shock in 3D. In order to reproduce 3D more accurately in the future, I will conduct a detailed analysis of the 3D simulation and construct a theoretical model for the development of 1D+. In my tolk, I will explain our 1D+ simulation model and examples of collaborations with other fields using 1D+.

17:15 -- 17:30 Moka Nishigaki (NAOJ, Sokendai 3^rd year (D1))

Title: Modeling the Mass-Metallicity Relation with Dark Matter Halo Assembly from z=0–10

Abstract: Cosmic baryon cycling plays a crucial role in galaxy evolution. While direct observations of the gases involved in this process are particularly challenging in the distant universe, recent advancements in galaxy metallicity observations have provided us with indirect insights into these baryon cycling mechanisms. Our study aims to enhance our understanding of galaxy evolution by developing models that can self-consistently explain various observations including the mass-metallicity relation, ranging from the early universe to the present. In this talk, I will provide an overview of our preliminary results from this project.

17:30 -- 17:45 Jinyang Li (KEK, Sokendai 2^nd year (M2))

Title: QCD preheating: New frontier of baryogenesis

Abstract:

We find that QCD can create the cosmological matter abundance via out-of

-equilibrium processes during the QCD phase transition, that is what we

call the QCD preheating, where the dynamic transition of the QCD vacuum

characterized by the quark condensate takes place instantaneously. This

mechanism works when the Universe undergoes subsequent supercooled QCD

transition. We also find that the QCD preheating can work to create the

baryon asymmetry of the Universe if there is the new physics

communicated with QCD. These are new pictures of the thermal history

around the QCD-phase transition epoch, and thus the dynamic aspect of

the QCD vacuum opens a new frontier to explore low-scale matter

generation such as baryogenesis. Pursuing the QCD reheating era would

also help deeply understanding the subatomic-scale physics in the

thermal history of the Universe.

(Based on 10.1103/PhysRevD.108.023512 )

17:45 -- 18:00 Haruki Takahashi (KEK, Sokendai 3^rd year (D1))

Title: Gauge coupling unification in simplified grand gauge-Higgs unification

Abstract:

In this talk, I will talk about grand gauge-Higgs unification (GGHU) of five-dimensional SU(6) gauge theory compactified on an orbifold S^1/Z_2 with localized gauge kinetic terms. The SM fermions on the boundaries and some massive bulk fermions coupling to the SM fermions on the boundary are introduced. The number of bulk fermions is reduced to realize perturbative gauge coupling unification, which could not be done in the previous model. Although this reduction will lead to the additional generation mixings in the bulk which makes our analysis more complicated and nontrivial, the generation mixing of the SM fermions is reproduced in addition to the SM fermion mass hierarchy by mild tuning the bulk masses and parameters of the localized kinetic terms. Taking the power-law running contributions from the bulk fields into account, perturbative gauge coupling unification is shown to be realized at around 10^{14} GeV, which is a few orders smaller than the unification scale of four-dimensional grand unified theories.

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18:00 -- 18:30 Preparation for leaving Toyama U

18:30 -- 19:00 Heading to Hotel JAL City Toyama by a chartered bus

Overnight stay in Toyama City (Hotel JAL City Toyama)

October 20, 2023

08:00 Meet at the front of Hotel JAL City Toyama

08:00 — 09:00 Heading to KAGRA Observatory

09:00 Arrive at KAGRA Observatory

09:00 — 09:30 Tour of Research Building, Restroom break, Preparation for entering the mine

09:30 — 09:45 Arrival at the mine entrance of KAGRA, Entering the mine on foot

09:45 -- 11:00 Tour of the KAGRA research facilities

11:00 — 11:15 Walking out of the mine

11:15 -- 11:45 Arrive at research building, Restroom break, Prepare to leave

11:45 -- 12:45 Heading to Toyama Station by a chartered bus

12:45 -- Dispersing on your own at Toyama Station

【世話人】

関井隆 (国立天文台大学院教育室長・天文学コース長)

竝木則行 (国立天文台RISE月惑星探査プロジェクト長・天文学コース副コース長)

都丸隆行 (国立天文台重力波プロジェクト長)

野村英子 (国立天文台科学研究部)

郡　和範 (国立天文台科学研究部)

本田融 (高エネルギー加速器科学研究科長)

紙谷琢哉 (高エネルギー加速器科学研究科加速器科学コース長)

瀬戸秀紀(高エネルギー加速器科学研究科物質構造科学コース長)

西村淳 (高エネルギー加速器科学研究科素粒子原子核コース長)

原　隆宣 (高エネルギー加速器科学研究科素粒子原子核副コース長)

松原隆彦 (高エネルギー加速器科学研究科素粒子原子核副コース長)

問い合わせ先: 郡　和範 (こおり　かずのり)

https://sci.nao.ac.jp/main/member

高エネ研–国立天文台連携セミナートップページ

https://research.kek.jp/people/kohri/KEK-NAOJ-JointSeminar.html

The 1^st meeting on Friday, 1^st Oct., 2021 at 10:00 -- 12:00

https://research.kek.jp/people/kohri/01-KEK-NAOJ-JointSeminar.html

The 2^nd meeting on Friday, 24^thJune, 2022

https://research.kek.jp/people/kohri/02-KEK-NAOJ-JointSeminar.html

The 3^rd meeting on Friday, 21^stOct, 2022

https://research.kek.jp/people/kohri/03-KEK-NAOJ-JointSeminar.html

The 4^th meeting from Thursday, 19^thto Friday, 20^th Oct, 2023

https://research.kek.jp/people/kohri/04-KEK-NAOJ-JointSeminar.html