A possible "uncrossable" boarder between bradyons and hypothetical tachyons... I would like to ask about a correlation between baryonic matter and hypothetical tachyons. From this I assume that there is a barrier between the highest speed a bradyon can achieve(infinetly close to c) and the lowest speed a tachyon could achieve(?)... So from the above I could assume that for the bradyon: v~e, and for the tachyon v~1/e. I'm not great at maths or physics, but could someone help me equate the two. Or maybe it would be better to equate e=mc^2(bradyon) and e^(-1)=mc^2 ?(tachyon)...but now I think we would need complex numbers. :( Thanks for any help Maybe it's just c that can't be achieved by anything other than light?