Finally we are getting out of bandaid of dark matter. But... To constantly move faster than light, don't you need constant input of energy to at least keep the speed? Especially when you are an object with some mass?
There is nothing in space to apply force on particles. One would also presume these tachyons don't interact much with regular matter, like neutrinos
Model in article is another form of dark matter. And tachyonic dark matter has been considered for at least 20 years.
dark matter is observed.