Detection prospects of higher memory effects.

Gravitational-wave (GW) memory effects cause lasting changes in spacetime metric following the passage of GWs. Recent work identified a new hierarchy of "higher memory effects." These include the displacement, spin, and center-of-mass memories at the two lowest orders. The detection prospects for measuring the displacement and spin memory effects have been previously studied, and they were expected to be the largest signals detectable from binary black hole mergers. In this talk, we will discuss the prospects for detecting a second-order higher memory effect, which is named the "ballistic" memory effect. The detection of this effect from individual GW events is challenging with current GW detectors. However, we follow the procedure of combining the sub-threshold evidence from individual events to obtain more significant evidence for the effect in a population of black-hole mergers. The study forecasts the detection prospects for the ballistic memory effect in current and future ground-based GW detectors.