Although black holes can be the remnants of dead stars, it is also possible that some predate stars. Such primordial black holes(PBHs) are a special (non-particle) dark matter candidate, and they could also explain some of the unexpected properties of the black hole mergers that LIGO-Virgo-KAGRA have detected. The speaker will summarise the evidence and challenges behind this claim, linking PBH formation to inflation. There is an interesting coincidence of scales between the black hole merger events, the Chandrasekhar limit, the horizon mass during the Quantum chromodynamics(QCD) transition in the early universe, and the wavelength of gravitational waves on which NANOGrav may (potentially) have detected a stochastic gravitational wave background.
頻道：(網上講授)Zoom ID:421-480-1692 ← cosmology
講者：Christian Byrnes(Sussex University)
“Copernicus Webinar and Colloquium Series”: To promote scientific discussions during this pandemic, they are organizing an online seminar series, i.e. Copernicus Webinar Series, seeking the most outstanding speakers to introduce innovative ideas and important progress in the field of gravity and cosmology. This series is named after the famous Polish Astronomer, Nicolaus Copernicus, whose discovery eventually marked the dawn of modern science.