세종대학교 두드림 비교과통합관리시스템

With the LIGO-Virgo-KAGRA (LVK) detectors, the first part of the fourth Observing Run (O4) of gravitational waves (GWs) was successfully done. The second part of the O4  has been on-going since May 2023. Compact binary coalescences (CBCs) that consist of stellar-mass black holes or neutron stars are accessible in the GW frequency of 10-2000 Hz based on the sensitivities of existing detectors. In this talk, I will present what we have learned about black holes and neutron stars by GW observations and discuss what we can do in the next decades with future detectors. If time allows, I would also touch on the implications of multimessenger astronomy and cosmology with the example of GW170817, a double neutron star system.