Lunch talk on Nov. 28, 2022

Gravitational Waves from Primordial Black Hole Inspiralling inside Compact Star: Novel Probe for Dense Matter Equation of State

Speaker: Zecheng Zou (Nanjing University)

Venue: Video Conference

Time: 12:30 PM, Monday, Nov. 28, 2022

Abstract: 

Primordial black holes have long been considered a candidate for dark matter. Their collisions with compact stars (e.g., neutron stars) are widely used to constrain their composition of dark matter, which was initially thought to be quite strict for asteroid- or planet-mass primordial black holes. However, such constraints are later found to be ambiguous due to a lack of detailed dynamics and possible signatures. In this talk, I will first briefly review the current constraints on the dark matter composition by asteroid- or planet-mass primordial black holes. I will illustrate the capture process of a primordial black hole by a compact star, and discuss the possible observation signatures. Focusing on the gravitational-wave emission from the process, I will show that the detections of gravitational-wave signals can remove the ambiguity of a capture event. Finally, I will discuss the possibility of using such potential signatures to further probe the interior structure of compact stars and the corresponding dense matter equation of state.

Report PPT:  SWIFAR_Zecheng Zou.pdf