Unveiling the Complexity of Black Holes: Paired Entities Pulled by Cosmic Expansion

A new paper suggests that black holes might not be as simple as previously thought. According to the metaphorically-named 'no-hair theorem', all the information about a black hole can be described by its mass, angular momentum, and charge. However, researchers have identified scenarios where black holes could become 'hairy', violating this theorem. By considering binary black hole systems and the repulsion between charged black holes, they propose the existence of stable equilibrium and multiple horizons. This analysis also suggests that a cosmological constant, similar to dark energy, could prevent certain black holes from merging. While these findings challenge current theorems, further research is needed to test their validity.