Title：How to identify the gravitational wave events from merging stellar mass black binaries like GW150914?

　　Speaker：Shuang-Nan ZHANG (IHEP）

　　Abstract：We study how to identify the gravitational wave events from merging stellar mass black binaries like GW150914. We briefly investigate the possible growth and merging processes of the two stellar mass black holes in the merging event of GW150914 detected by aLIGO, as clocked by a distant external observer, as well as the prospect of detecting the GW150914-like events using pulsar timing. Our main results are: (1) The description of the black hole growth using stationary metric of a pre-existing black hole is inconsistent with GW150914; (2) Only gravitational wave radiation can be produced in the coalescence of two black holes such as that in the GW150914 event; and (3) Pulsar timing can not detect the GW150914-like events. Future high sensitivity detections of gravitational waves from merging black holes might be used to probe matter distribution and space-time geometry in the vicinity of the horizon. Perhaps the GW150914-like events can be identified with traditional astronomy observations only if the black holes are embedded in extremely dense medium before their final merge, when very strong electromagnetic radiation is produced and can escape from the system.

　　Time：April 19 (Tuesday), 10:00am

　　Place：Room 212, Astronomy Building

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