What are the hypothetical subatomic particles known as dybbuks?

Question

What are the hypothetical subatomic particles known as dybbuks?

Answer 1

hypothetical faster-than-light particle called a dybbuk (Hebrew for a "roving spirit"), which would have imaginary mass, energy, and momentum. Dybbuks, proposed by Raymond Fox of the Israel Institute of Technology, are so strange that some of their odd properties cancel out to an observer yet, interestingly, they avoid the causality problem of tachyons.