안녕하십니까.
오는 수요일(2월 28일) 오후 4:00에 아래와 같이 2024년 상반기 첫 정규 콜로키움이 진행될 예정입니다.
발표자: 채규현 교수 (세종대학교)
호스트: 노혜림
장소: 장영실홀 331-1 및 원격 연결
일시: 2월 28일 (수) 오후 4:00
접속주소: https://zoom.us/j/92444602963?pwd=VXJzWE1zd3VkYmZ1SjRMeXRFQy9kQT09
교육학점: 천문연 소속 현장참석자의 경우 필수 0.5 학점 부여
제목: Current observational evidence
for the low-acceleration gravitational anomaly in wide binary stars
observed by the Gaia satellite and future prospect
초록:
Gaia DR3 provides state-of-art data of proper motions (transverse
velocities), parallaxes (distances), radial velocities, and luminosities
for nearby stars. Statistical analyses of binary stars show that
Newton-Einstein standard gravity holds for the orbit size less than about
1000 astronomical units (au) or the internal acceleration greater than
about 6 nanometer per second squared. However, binary orbital motions
exhibit a gradual systematic anomaly from 1000 to 5000 au and a
pseudo-Newtonian gravity with Newton’s constant boosted by a factor of
1.4 holds for > 5000 au. Remarkably, this behavior agrees with the
prediction of Milgromian (modified Newtonian dynamics) gravity.
Consistent results are obtained from three independent methods of
statistical analysis, the "acceleration plane analysis”, the
“normalized velocity profile analysis”, and the “stacked velocity profile
analysis” based on various samples of binaries. These results indicate
that general relativity breaks down in the low acceleration limit because
its nonrelativistic limit becomes Newtonian. A paradigm shift is under
way in astrophysics, cosmology, and theoretical physics. Implications of
the results and future prospect are discussed.
진행언어 : 영어
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/92444602963?pwd=VXJzWE1zd3VkYmZ1SjRMeXRFQy9kQT09
C. 유의사항 : 접속 후 "마이크는 뮤트로 설정" - 기본설정은 뮤트로 되어있음
> 질의 응답시간에는 마이크를 사용해서 질문 가능함
2024년 상반기 천문연구원 콜로키움 일정
https://www.kasi.re.kr/kor/publication/post/notice/29938
(위 일정은 연사분의 상황에 따라서 변경될 수 있습니다.)
천문연 콜로키움 위원회 (김종수, 선광일, 이창원, 문홍규, 노혜림, 한정열)
운영위원회(김진호, 송영범, 오재석, 윤용민, 조영수, 홍경수)
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Dear all,
The first KASI's regular colloquium in the first half of 2024 is
scheduled at February 28, as shown below.
Speaker: Prof. Kyu-Hyun Chae (Sejong University)
Host: Hyerim Noh
Place : Jang Yeong-sil Hall 331-1 & Online
Time : February 28 (Wed) 4:00 pm
Access: https://zoom.us/j/92444602963?pwd=VXJzWE1zd3VkYmZ1SjRMeXRFQy9kQT09
KASI Educational credits: 0.5 educational credits are awarded to off-line
attendees.
Title: Current observational evidence for the low-acceleration gravitational
anomaly in wide binary stars observed by the Gaia satellite and future prospect
Abstract:
Gaia DR3 provides state-of-art data of proper motions (transverse
velocities), parallaxes (distances), radial velocities, and luminosities
for nearby stars. Statistical analyses of binary stars show that
Newton-Einstein standard gravity holds for the orbit size less than about
1000 astronomical units (au) or the internal acceleration greater than
about 6 nanometer per second squared. However, binary orbital motions
exhibit a gradual systematic anomaly from 1000 to 5000 au and a
pseudo-Newtonian gravity with Newton’s constant boosted by a factor of
1.4 holds for > 5000 au. Remarkably, this behavior agrees with the
prediction of Milgromian (modified Newtonian dynamics) gravity.
Consistent results are obtained from three independent methods of
statistical analysis, the "acceleration plane analysis”, the
“normalized velocity profile analysis”, and the “stacked velocity profile
analysis” based on various samples of binaries. These results indicate
that general relativity breaks down in the low acceleration limit because
its nonrelativistic limit becomes Newtonian. A paradigm shift is under
way in astrophysics, cosmology, and theoretical physics. Implications of
the results and future prospect are discussed.
Language : English
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/92444602963?pwd=VXJzWE1zd3VkYmZ1SjRMeXRFQy9kQT09
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.
2024A KASI Colloquium Schedule
https://www.kasi.re.kr/kor/publication/post/notice/29938
(This schedule may vary depending on the speakers' schedule.)
KASI Colloquium committee (Jongsoo Kim, Kwang-Il Seon, Chang Won Lee, Hong-Kyu
Moon, Hyerim Noh, Jeong-yeol Han)
Working committee (Jinho Kim, Youngbum Song, Jae Sok Oh, Yongmin Yoon, Youngsoo
Jo, Kyeongsoo Hong)
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