Black hole with nearly extreme spin attempts to regrow hair but could become bald again

Black holes ‘have no hair’: no attributes that can be used to tell them apart. Extreme black holes (spinning at maximally allowed rate) can have an additional property, permanent hair that is made of a massless scalar field. Nearly extreme black holes (like Gargantua, the black hole featured in the movie "Interstellar") have hair that is a transient phenomenon: nearly extreme black holes that attempt to regrow hair will lose it and become bald again.

 

The black holes of Einstein’s theory of relativity can be completely described by just three parameters: their mass, spin angular momentum, and electric charge. Since two black holes that share these parameters cannot be distinguished, regardless of how they were made, black holes are said to "have no hair"—they have no additional attributes that can be used to tell them apart.

 

 

Sourced through Scoop.it from: phys.org