Re: Do WIMPS have antiparticles?

Hi Isaac,

Sorry about the long delay in replying. The short answer is yes, every particle has an antiparticle, so if there are WIMPs, there are also anti-WIMPs.

The more interesting question (and one that is yet to be answered) is whether or not WIMPs and anti-WIMPs would be mirror images of each other (like electrons and positrons) or whether WIMPs and anti-WIMPs are the same particle (like photons.) Particles identical with their antiparticles are called Majorana particles.

So far, the only elementary Majorana particles known to exist have integer spins (bosons), but some theories suggest that Majorana fermions may also exist, which would be half-integer spin particles that are also their antiparticles. It is still not fully settled whether the neutrino is a Majorana fermion or not, and since we still don't know what WIMPs are (if they exist at all), some physicists are investigating models where WIMPs are also Majorana fermions.

I hope this helps!