Decay of black hole 

Black Hole

 Region of space resulting from the collapse of a star. It is a region of space with strong gravitational field that even light cannot escape it. The largest thing in the universe is the black hole. In contrast to things like planets or stars they have no physical size limit, and can grow endlessly. Although specific things need to happen to create various kinds of black holes, from tiny ones to the largest single things in the universe.  

 Primordial Black Holes.  

The smallest Black holes may or may not exist. If they do, they are the oldest objects in the universe, older even than atoms, they would have formed just after the big bang, when the universe was so dense with violent energy, that any tiny pocket that was just slightly denser than its neighbors could produce a black hole. The smallest Primordial Black Hole that could still be around would be a trillion kilograms or so, the mass of a big mountain. And yet they would be no bigger than a proton. A Primordial Black hole with the mass of earth would barely be larger than a coin, this makes them extremely hard to find, so we have not observed any yet – if they exist, they may even be the mysterious dark matter that holds galaxies together.  

Stellar Black Holes 

 Stellar Black Holes To make a black hole we need to compress enough matter so that it collapses into itself. After   that, the more mass we throw at it, the larger it becomes.  

Hawking radiation (1974) 

Hawking radiation is thermal radiation that is theorized to be released outside a black hole event horizon because of relativistic quantum effect. It is named after the physicist Stephen Hawking. A theoretical argument for its existence was proposed in 194. 



Black hole Evaporation 

Black holes are decaying, and losing mass over time, because the energy emitted by this Hawking radiation is slowly reducing the curvature of space in that region. Once enough time passes, and the duration is enormous for realistic black holes, they will have evaporated entirely. The radiation temperature is inversely proportional to the black hole's mass, so micro black holes are predicted to be larger emitters of radiation than large black holes and should dissipate faster.