Thread:Ghelæ/@comment-29927902-20161001081010/@comment-47205-20170324085255

Assuming you want to ignore both why negative-energy particles don't exist, and the problems that would arise if we allowed all quanta to have negative-energy states, the main effect of a negative-energy photon will be to lower an excited state of an atom to a lower state, down to a minimum (the ground state). In this case, the laser's effect will be limited: by removing energy from excited molecules there, it might be able to slightly cool down an area of skin (depending on the photons' wavelength), but not more than a positive-energy laser pointer of the same wavelength will heat it up. The ability of the negative-energy laser to remove energy is equivalent to the ability of the positive-energy laser to add it, because the two processes are simply the reverse of each other.