I was reading this post Black holes and positive/negative-energy particles because I was wondering how Hawking radiation works and why always the anti-particle falls into a black hole, which is nicely explained there.
However, I feel that I have an understanding problem what vacuum fluctuation really is. Is it a pair of particle-anti-particle, e.g. electron and positron (as I assumed...) or positive-negative-mass-particle? If the latter is true, what is the negative particle then, surely not a positron...?
Matter/antimatter or matter/negative-matter is not the same and it's important when understanding Hawking radiation (as in the post mentioned above). That is because anti-particles like positrons have still positive mass, thus falling into the black hole would just grow the hole. (Or in other words: If we would produce antimatter in particle accelerators and pour it into a black hole, it would grow, correct?)
Also, if vacuum fluctuations consist of positive and negative mass (or energy), the annihilation would produce zero energy, whereas I thought the explanation for vacuum fluctuations is some remaining "zero-point-energy" in quantum mechanics... thus I assumed real antimatter.