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Dark matter annihilation is the matter/antimatter annihilation of WIMPs, i.e., dark matter particles. A favorable WIMP candidate, the neutralino, would be its own antiparticle, and an interaction between two would annihilate (in the manner of an electron and positron). Given the lack of much of a force bringing them together (only gravity, which is quite weak at particle scale), the total amount of annihilation could be too small to make much mass difference after the time of the very early universe. Details of such annihilation, such as the relevant cross section, are part of theories of Big Bang nucleosynthesis and the resulting particle abundances. Such annihilation would produce some kind of particles, perhaps photons, and detection of some possible results has been proposed as a means to help confirm dark matter's existence.