3rd Seminar on Gravitational Waves and Numerical Relativity
 Date: Sep. 12 (Fri.), 2018, 1 pm  5 pm
 Venue: Room 501, Building #56, SNU
Sessions
 GravitationalWave Fringes at LIGO: Detecting Compact Dark Matter by Gravitational Lensing
 Speaker: Sunghoon Jung (SNU)
 Abstract: Utilizing gravitationalwave (GW) lensing opens a new way to understand the smallscale structure of the universe. We show that, in spite of its coarse angular resolution and short duration of observation, LIGO can detect the GW lensing induced by small structures, in particular by compact dark matter (DM) of \(10 − 10^5 M_{\odot}\), which remains an interesting DM candidate. The lensing is detected through GW frequency chirping, creating the natural and rapid change of lensing patterns: frequencydependent amplification and modulation of GW waveforms. As a highestfrequency GW detector, LIGO is a unique GW lab to probe such light compact DM. With the design sensitivity of Advanced LIGO, oneyear observation by three detectors can optimistically constrain the compact DM fraction as small as \(f_{\rm{DM}} \ge 10^{−2}\).

Slide File
 Gravitational Waveform Modulation from Binary Black Hole Spin Precession
Photos