What does Stephan Hawking think about the holographic universe theory?
Stephen Hawking had earlier shown that the total horizon area of a collection of black holes always increases with time. The horizon is a boundary defined by lightlike geodesics, it is those light rays that are just barely unable to escape. If neighboring geodesics start moving toward each other they eventually collide, at which point their extension is inside the black hole. So the geodesics are always moving apart, and the number of geodesics which generate the boundary, the area of the horizon, always increases. Hawking’s result was called the second law of black hole thermodynamics, by analogy with the law of entropy increase, but at first, he did not take the analogy too seriously. Hawking knew that if the horizon area was an actual entropy, black holes would have to radiate. When heat is added to a thermal system, the change in entropy is the increase in mass-energy divided by temperature: If black holes have a finite entropy, they should also have a finite temperature. In partic
