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I have been watching videos of WIMP's and have a simple question..

The larger the particles, the shorter their lifetime. A top quark is so massive that it cannot form a "stable" bond with any other particle to form a meson or baryon.

If WIMPS are too massive to make in a particle accelerator, how can they still be around today to affect gravity of galaxies? Wouldn't they have decayed by now into things we could see or detect?

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