In my previous post, I introduced a character or more specifically a cat named Jürgen. The previous post was about Schwarzschild radii and what would happen if our beloved cat, Jürgen, became one. We also established the fact that if Jürgen were to turn into a black hole, he would indeed be a very short lived one.
Why would this happen? Why cannot Jürgen remain a creature of darkness and terrorize all of humanity?
Let's try answering these, shall we?
A black hole, thermodynamically speaking, is what is called a perfectly black body(no surprises there). What is a perfectly black body? It is defined as a body which absorbs all the radiation that is incident on it and does not reflect or transmit that radiation. Although a perfectly black body is only allowed to absorb radiation, it is not restricted from radiating heat. However, in the case of a black hole, its gravitational pull is so strong that it sucks back the radiation into itself, thereby making it difficult to detect. However, black holes can be detected by the means of something known as Hawking radiation.
In what is known as the quantum vacuum, virtual particles(particle-antiparticle pairs) keep winking in and out of existence and is a very common phenomenon. However when this happens near the event horizon of the black hole, one of these particles in the pair tend to get sucked in, while the other escapes. When this happens, the particle that escapes, whether it’s matter or antimatter, has real, positive energy, and the black hole loses a corresponding amount of mass to make up for it. This kind of radiation is what is called Hawking radiation. For a big black hole this radiation is very cold, and the temperature and the amount of radiation keeps increasing. Since more and more radiation is evolved, more mass of the black gets converted, thus leading to a vicious cycle of events. This leads to the black hole getting evaporated and finally going out with a bang.
How does this affect our dear Jürgen? Jürgen is a black hole(originally was a cat but now no longer has the properties of a cat) whose radius is 1.5*10^-27 m. As mentioned in the previous post, this is extremely smaller smaller than an atom. A black hole of this size would evaporate completely almost as soon as it is created, thereby leading to the untimely demise of our beloved Jürgen. But don't mourn him yet for this will make him immortal as he will become pure energy and continue on forever.
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