I'm currently studying A level physics, but I enjoy reading as much as I can on more advanced Physics, in particular theoretical physics.
I recently read into Hawking radiation and how virtual particles manifesting on the edge of a black hole's event horizon cause Hawking radiation (with one particle being sucked into the black hole whilst the other is free to radiate out).
My question is twofold; "Is it correct in stating that virtual particles used 'borrowed energy' that they 'give' back when they collide and destroy one another?" and secondly "If so, in the case of Hawking radiation when they never collide, how is this 'borrowed energy' given back, or more to the point; how is energy conserved?"
P.S. I know this isn't classical mechanics but there isn't a topic for it! :)