This new insight into the behavior of fast-spinning black holes or neutron stars would come as an extension to Einstein’s theory of gravity. 

“While previous studies have already provided examples of ‘hairy’ black hole solutions, we have shown for the first time, thanks to numerical simulations, that black holes can spontaneously grow the simplest form of permanent hair (a scalar field) once they start spinning fast enough,” says Alexandru Dima, astrophysicist at SISSA and INFN and first author of the paper.



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