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

第4回高エネ研–国立天文台連携セミナー

KAGRAサイト-富山大学

[Photos]

https://research.kek.jp/people/kohri/photo-20231019.html

[Program]

Program in English

https://research.kek.jp/people/kohri/Program_E-20231019-20.html

KAGRA坑内に立ち入る際の注意事項

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

コンビニエンスストア地図

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

ホテルJALシティ富山館内ご利用案内

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

[10月19日(木)]

15:00 -- 16:30 ホテル JAL City 富山でチェックインを済ます

-- 15:30 富山駅南口の「ホテルJALシティ富山」正面に集合

15:30 -- 16:00 富山大学五福キャンパスにバスで移動 (借り上げバス)

-- 16:00 富山大学に到着

16:00 -- 16:25 セミナー室の準備

16:25 -- 18:00 総研大(NAOJ+KEK)と富山大との研究交流セミナー

(富山大学五福キャンパス理学部物理教室 A239教室)

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16:25 -- 16:30 挨拶 (富山大素粒子論研究室柿崎充)

16:30 -- 16:45 大澤周平 (富山大素粒子論研究室 D1)

タイトル：Investigation of Extended Higgs Models

アブストラクト：

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 加藤順平 (富山大山元研 M2)

タイトル：Laser Intensity Stabilization System of KAGRA for O4

アブストラクト：

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 佐々木俊輔 (国立天文台総研大4年(D2))

タイトル： Developing "1D+" simulation of core-collapse supernovae

アブストラクト：

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 西垣萌香 (国立天文台総研大3年(D1))

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

アブストラクト: 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総研大2年(M2))

タイトル: QCD preheating: New frontier of baryogenesis

アブストラクト:

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 高橋晴輝 (KEK総研大3年(D1))

タイトル: Gauge coupling unification in simplified grand gauge-Higgs unification

アブストラクト:

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 帰る準備

18:30 -- 19:00 宿泊施設(ホテルJALシティ富山)へ移動 (借り上げバス)

[10月20日 (金)]

08:00 「ホテルJALシティ富山」正面に集合

08:00 -- 09:00 バスで重力波研究棟へ移動

09:00 重力波研究棟到着

09:00 — 09:30研究棟見学、トイレ休憩、入坑準備

09:30 — 09:45 KAGRA坑口到着、徒歩入坑

09:45 -- 11:00 KAGRA見学 (都丸隆行さん他解説)

11:00 — 11:15 徒歩出坑

11:15 — 11:45 研究棟到着、トイレ休憩、帰る準備