The Basic Physics of the Binary Black Hole Merger GW150914
The first direct gravitational-wave detection was made by the Advanced Laser Interferometer Gravitational Wave Observatory on September 14, 2015. The GW150914 signal was strong enough to be apparent, without using any waveform model, in the filtered detector strain data. Here, features of the signal visible in the data are analyzed using concepts from Newtonian physics and general relativity, accessible to anyone with a general physics background. The simple analysis presented here is consistent with the fully general-relativistic analyses published elsewhere, in showing that the signal was produced by the inspiral and subsequent merger of two black holes. The black holes were each of approximately 35 M⊙, still orbited each other as close as ∼350 km apart and subsequently merged to form a single black hole. Similar reasoning, directly from the data, is used to roughly estimate how far these black holes were from the Earth, and the energy that they radiated in gravitational waves.
B. P. Abbott et al., "The Basic Physics of the Binary Black Hole Merger GW150914," Annalen der Physik, vol. 529, no. 1-2, John Wiley & Sons, Jan 2017.
The definitive version is available at https://doi.org/10.1002/andp.201600209
Keywords and Phrases
Gravitational effects; Gravity waves; Interferometers; Laser interferometry; Merging; Orbits; Relativity; Stars; Black holes; General Relativity; Gravitational-wave detection; GW150914; Laser interferometer gravitational-wave observatories; Newtonian physics; Relativistic analysis; Waveform modeling; Gravitation; Black holes; Gravitational waves
International Standard Serial Number (ISSN)
Article - Journal
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