2018/03/28(Wed) 14:00 -15:30 七樓研討室 7F, P7F Seminar Room
Title
Probing The Supermassive Black Hole Formation At High Redshifts: gravitational radiation from the collapse of supermassive stars
Speaker
Dr. Jung-Tsung Li (University of California, San Diego, USA)Abstract
I will talk about the neutrino-burst generated linear memory gravitational wave signals produced during the collapse of supermassive stars to supermassive black holes. An object with a mass ~ 10^5 M_sun, with primordial metallicity, is an optimal case with respect to the fraction of its rest mass emitted in neutrinos as it collapses to a black hole: lower initial mass objects will be subject to scattering-induced neutrino trapping; while higher masses will not get hot enough to radiate significant neutrino energy before producing a black hole. The optimal case collapse will radiate several percents of the star’s rest mass in neutrinos and, with an assumed small asymmetry in temperature at peak neutrino production, produces a characteristic lineaar memory gravitational wave burst signature. With the envisioned ultimate DECIGO design sensitivity, we estimate that the linear memory signal from these events could be detectable to the epoch of reionization.
Language
演講語言 (Language): in English