Similarly, in 2014, a team led by theoretical physicist Carlo Rovelli suggested that once black holes could no longer evaporate and shrink due to the constraints of space-time, the black hole would then experience a quantum bounce (an outward pressure) and transform into a white hole. This means that black holes become white holes almost at the instant they form. However, outside observers continue to see a black hole for billions of years because of gravity’s time dilation. If this theory is correct, black holes that formed in the early years of the universe could be ready to die and burst into cosmic rays or another form of radiation at any moment.
A rare dip in entropy could temporarily reverse time and form a white hole. The only problem is that once time resumed its normal course, the white hole would explode and vanish in a powerful burst of energy. Some scientists speculate that this is exactly what created our universe; the Big Bang does mathematically look a lot like a white hole, the only difference being that the Big Bang had no singularity and instead occurred everywhere at the same time. But it would explain why so much matter and energy suddenly appeared.