"Physics Unveils: The Deceptive Dance of Dual Black Holes"
Researchers have discovered that the uniqueness theorems for black holes, which state that all black holes with the same mass and rotation are identical, can be violated in the presence of a positive cosmological constant. By positioning two black holes in such a way that their gravitational attraction is balanced by the acceleration due to the cosmological constant, they appear as a single black hole to distant observers. This finding challenges our understanding of black hole simplicity and raises the possibility of isolated pairs of black holes in the universe that are indistinguishable from a single black hole.