this post was submitted on 28 Sep 2023
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Physics
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There are no known particles. However, you can get a great foray into negative inertial mass from a PBS Spacetime that was done on the subject.
The answer is, we don't know, but it seems unlikely as negative inertial mass breaks a lot of well established things. But you never know, could be something we're missing that "fixes" all the breakage negative inertial mass causes.