한국중력파연구협력단 - 한국천문연구원 공동 콜로퀴움

최근 전세계적으로 달탐사에대한 관심이 고조되고 있는 가운데 중력파에 의해 야기될 수 있는 달 표면의 진동을 이용해 중력파를 측정하고자 하는 논의가 시작되고 있습니다. 이에 한국중력파 연구협력단(KGWG)와 한국천문연구원(KASI)은 공동으로 이태라 그랜드 사소 과학연구소의 Jan Harms 교수를모시고 관련된 주제에 대한 온라인 콜로퀴움을 개최하고자 하니 많이 참석해 주시기 바랍니다.

KGWG-KASIJoint Colloquium

Recently the old idea measuring the surface vibration of the Moon excited by gravitational waves is now being discussed among scientists worldwide. The Korean Gravitational Wave Group (KGWG) and KASI are planning to hold a joint colloquium on this subject by inviting a specialist, Prof. Jan Harms at Grand Sasso Institute, Italy. Please join this colloquium.

ZoomInformation:

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Topic:Lunar Gravitational Antenna

Time:Apr 27, 2021 05:00 PM Seoul

JoinZoom Meeting

https://snu-ac-kr.zoom.us/j/87267497851?pwd=ODJHTjNvNklPOFMrNmxUZTBmdlF6UT09

MeetingID: 872 6749 7851

Passcode:762189

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Dateand Time: April 27, 2021 5:00 PM KST

Speaker:Prof. Jan Harms (Grand Sasso Science Institute, Italy)

Title:Lunar Gravitational-Wave Antenna

Abstract:

Gravitational waves excite quadrupolar vibrations of elastic bodies. Monitoring these vibrations was one of the first concepts proposed for the detection of gravitational waves by Joseph Weber. At laboratory scale, these experiments became known as resonant-bar detectors, which form an important part of the history of GW detection. Due to the dimensions of these bars, the targeted signal frequencies were in the kHz range. It was also Weber who suggested to monitor vibrations of Earth and Moon to search for gravitational waves in the mHz band. His Lunar Surface Gravimeter was deployed on the Moon in 1972 by the Apollo 17 crew. A design error made it impossible to carry out the intended search for GWs, but the idea remains intriguing. We have proposed a new concept, the Lunar Gravitational-Wave Antenna (LGWA), based on Weber’s idea. LGWA would have a rich GW and multi-messenger science case with galactic binaries and massive black-hole binaries. It would also serve as a high-precision geophysical station shedding light on the interior structure of the Moon, the mechanisms of moonquakes, and the Moon's formation history. The key component is a next-generation, high-sensitivity seismometer to be deployed on the Moon. For its most sensitive realization, LGWA would have to be deployed in a permanent shadow near the south pole of the Moon to benefit from the natural cryogenic environment. This would improve the sensitivity of the seismometer and also provide a lower-noise environment due to the absence of thermally induced seismic events that were observed in large numbers by the Apollo seismometers. Powering of the seismic stations and data transfer pose additional challenges for such a deployment.