Pulsar timing array is an experiment to detect gravitational waves with a frequency of nanohertz by accurate long-term observation of pulsars. It will not only open a new door for cosmology and astrophysics but also pave the way for multi-wavelength gravitational-wave astronomy. However, pulsar timing array suffers from various systematic errors such as dispersion delays caused by interstellar...
Supermassive black holes (SMBHs), with masses exceeding 10^6
solar masses (Msun), are believed to reside at the centers of nearly
all galaxies and significantly influence their host galaxies through
the so-called "co-evolution" of galaxies and SMBHs. However, the
origin of SMBHs remains a mystery and a major challenge in modern
astronomy. In this talk, I will first review the current...
Our universe has experienced phase transitions/crossovers several times throughout its thermal history. The gravitational wave (GW) as a cosmological phonograph can record and tell us about such history thanks to its high penetration ability. In particular, GWs sourced by oscillations of density contrasts called scalar-induced GWs (SIGWs), have sensitivity not only to the background...
