In quantum physics, a particle is "defined" by a wavefunction. If you would take 2 particles with the same wavefunction, and negate one of them. They would cancel each other other out. Take for example two photons. If light cancels out itself, it dissapears, but where does the energy go? Due to the "Preservation of Energy" it cant just dissappear. Also, both photons alone would be "light", so they aren't really anti-particles(relative to each other), right?
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1"If you would take 2 particles with the same wavefunction" Individual particles don't have a wavefunction, systems do. So what you are saying might no work. Related to energy conservation: https://physics.stackexchange.com/questions/23930 – jinawee Jul 18 '15 at 07:38
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@jinawee: thanks for the link. question can be closed. – Mystery Jul 18 '15 at 09:01