안녕하십니까.

오는 수요일(12월 10일) 오후 4:00에 아래와 같이 2025년 하반기 정규 콜로키움이 진행될 예정입니다.

발표 후에는 연사와의 대화시간(5:00-5:40) 및 저녁 식사가 예정되어 있으니 많은 참여 부탁드립니다.

발표자: 김주한 교수 (Korea Institute for Advanced Study)

호스트: 강용우

장소: 장영실홀 331-2 및 원격 연결

일시: 12월 10일 (수) 오후 4:00

접속주소: https://zoom.us/j/96778730290?pwd=guUS8r1bFbggZKMRVcSiTBnIGnZL8p.1

교육학점: 천문연 소속 현장참석자의 경우 필수 0.5 학점 부여

제목: Cosmology & Extragalactic Astronomy: From LCDM tensions to Space Observations

초록: 

The standard LCDM model has long served as a successful concordance model, reconciling the majority of cosmological observations. However, the era of "precision cosmology" has recently unveiled significant discrepancies, most notably the Hubble Tension and the debate over the dynamic nature of Dark Energy. This presentation suggests that the field is shifting from merely refining known parameters to searching for "new physics" through unexpected phenomena. We explore the synergistic research cycle between extragalactic observations and cosmological simulations. A primary focus is the Horizon Run 5 (HR5), a massive cosmological hydrodynamic simulation designed to capture both large-scale power and small-scale physics with high resolution. We compare HR5 predictions with recent high-redshift (z >= 5) galaxy stellar mass functions derived from JWST observations, discussing current agreements and discrepancies, particularly the underestimation of massive galaxy populations at 5< z <8. Furthermore, the presentation addresses the "Missing LSBG problem" and the study of Low Surface Brightness Galaxies (LSBGs) and IntraCluster Light (ICL) as key tracers for the mass-assembly history of galaxies and dark matter distribution in clusters. Finally, we introduce the DARWIN (DAzzling Realization of dWarf galaxies In the Next generation) project, a Korean consortium initiative aimed at resolving small-scale $Lambda$CDM tensions and understanding the origin of dwarf galaxies through next-generation high-resolution simulations.

진행언어: 한국어

슬라이드언어: 영어

원격 접속 방법 :

A. 웹 브라우저: Chrome을 추천하며 아래 주소를 실행시 Zoom 구동을 위한 프로그램이 설치될 수 있음

B. 접속 주소: https://zoom.us/j/96778730290?pwd=guUS8r1bFbggZKMRVcSiTBnIGnZL8p.1

C. 유의사항: 접속 후 "마이크는 뮤트로 설정" - 기본설정은 뮤트로 되어있음 > 질의 응답시간에는 마이크를 사용해서 질문 가능함

천문연 콜로키움 위원회 (김종수, 선광일, 이창원, 문홍규, 노혜림, 한정열)

운영위원회 (김진호, 김영민, 이석호, 홍준석, 석지연, 이재현)

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Dear all,

The KASI's regular colloquium is scheduled at Dec. 10, as shown below.

A conversation session with speakers and dinner are scheduled after the colloquium.

Speaker: Prof. Juhan Kim (Korea Institute for Advanced Study)

Host: 강용우

Place: Jang Yeong-sil Hall 331-2 & Online

Time: December 10 (Wed) 4:00 pm 

Access: https://zoom.us/j/96778730290?pwd=guUS8r1bFbggZKMRVcSiTBnIGnZL8p.1

KASI Educational credits: 0.5 educational credits are awarded to off-line attendees.

Title: Cosmology & Extragalactic Astronomy: From LCDM tensions to Space Observations

Abstract: 

The standard LCDM model has long served as a successful concordance model, reconciling the majority of cosmological observations. However, the era of "precision cosmology" has recently unveiled significant discrepancies, most notably the Hubble Tension and the debate over the dynamic nature of Dark Energy. This presentation suggests that the field is shifting from merely refining known parameters to searching for "new physics" through unexpected phenomena. We explore the synergistic research cycle between extragalactic observations and cosmological simulations. A primary focus is the Horizon Run 5 (HR5), a massive cosmological hydrodynamic simulation designed to capture both large-scale power and small-scale physics with high resolution. We compare HR5 predictions with recent high-redshift (z >= 5) galaxy stellar mass functions derived from JWST observations, discussing current agreements and discrepancies, particularly the underestimation of massive galaxy populations at 5< z <8. Furthermore, the presentation addresses the "Missing LSBG problem" and the study of Low Surface Brightness Galaxies (LSBGs) and IntraCluster Light (ICL) as key tracers for the mass-assembly history of galaxies and dark matter distribution in clusters. Finally, we introduce the DARWIN (DAzzling Realization of dWarf galaxies In the Next generation) project, a Korean consortium initiative aimed at resolving small-scale $Lambda$CDM tensions and understanding the origin of dwarf galaxies through next-generation high-resolution simulations.

Language: Korean

Slide Language: English

Remote access procedure:

A. Web browser: Chrome - When executing the address below, a program for additional zoom operation can be installed.

B. Access: Go to  https://zoom.us/j/96778730290?pwd=guUS8r1bFbggZKMRVcSiTBnIGnZL8p.1

C. Notice: After join, Please mute your microphone. - The default setting is microphone mute. > After the presentation, during the Q&A session, you can use the microphone to ask questions.

KASI Colloquium committee (Jongsoo Kim, Kwang-Il Seon, Chang Won Lee, Hong-Kyu Moon, Hyerim Noh, Jeong-Yeol Han)

Working committee (Jinho Kim, Young-Min Kim, Seokho Lee, Junseok Hong,  Ji Yeon Seok, Jaehyun Lee)