Very intuitive and simple to understand right.

Hawking radiation is usually explained as the result when one pair of virtual particles are formed, and one of them enter the black hole, and the other escapes. We take the results of our two approximate solutions and add them up, to get another good approximation. Then, we take a little harder case (harder, but still way away from reality) and do the calculation for it. So, to make it easier, we take a very simple case (which is far far far away from what is actually happening like the first Feynman diagram we saw) and do the calculations. Two repelling electrons may not seem like much, but it it involves a lot of complicated (and a rather messy) range of calculations. Sometimes we have to solve problems that are too hard, like the interaction we saw above. This was a crude analogy of what perturbation theory is. If that does not work, then you would try fiddle around by adding or subtracting something, and then apply the formula. What would you do? You would try to solve the problem using the formula you know. But the problem is a more harder version than that. You know the formula (x +a)² = x² + 2ax + a². Imagine you want to solve an algebra problem. Now, this point requires a bit more attention. We won’t go deep into the exact specifics of all the possible Feynman diagrams, but maybe I will follow up in the future. The slight caveat, as you can see in my messy diagram above, is that there are many possible ways by which the two electrons can repel each other.

Virtual particles