세미나

[2020-2 BK세미나시리즈] 2020년 11월 30일 16:00, 김정리 교수(이화여자대학교)
2021-02-16 11:45:53 조회수6

    Hunting for black hole binaries with gravitational waves

  • 일 시 : 2020년 11월 30일 월요일 16:00

  • 연 사 : 김 정 리 교수 (이화여자대학교 물리학과)

  • 장 소 : 자연과학관 747호

  • 초 록

The discovery of GW150914 showed some black holes do merge and the coalescence of a binary black hole (BBH) can be "directly observable" with gravitational waves (GWs). Although imaging is not possible with GW observation, masses of individual black holes in a binary can be measured by GW observation with impressive accuracy. With the mass and distance estimates of many BBHs,  we can apply the 'standard siren' method to measure a Hubble constant , which was first suggested by Bernard Schutz in 1986. Stellar-mass BBHs are observable with km-scale laser interferometry in the GW frequency range of 10-2000 Hz. Supermassive BBHs would be observable by precision timing of millisecond radio pulsars at nano Hertz frequencies of GW signals. In this talk, I will give an overview on the second Gravitational-Wave Transient Catalog (GWTC-2) published in October, 2020 by the LIGO-Virgo collaboration. If time allows, I will try to briefly touch on the pulsar timing array and their expected constraints for GW background formed by superpositions of supermassive BBHs. Then, I will conclude with prospects for BH astrophysics and "GW cosmology" for the next decades.

KakaoTalk_20201130_162311164_05 

 
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