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Astrophysicists find no 'hair' on black holes
According to Einstein’s theory of gravity, black holes have only a small handful of distinguishing characteristics. Quantum theory implies they may have more. Now an experimental search finds that any of this extra ‘hair’ has to be pretty short.
“As years went by and the events piled up, we realized that we could have stronger, more robust tests of the theory [of general relativity] — or alternatives,” said Vitor Cardoso, a physicist at the Niels Bohr Institute in Copenhagen. Then, at a conference later that year, a graduate student in the Leuven group, Simon Maenaut, met Gregorio Carullo, a postdoctoral researcher in Copenhagen at the time who was an expert in analyzing gravitational wave signals. When they met at a conference, Gregorio Carullo (left) and Simon Maenaut realized that they could combine the latter’s analysis techniques with the former’s gravitational wave data to conduct a test of the no-hair conjecture.
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