Tachyons: Properties, Predictions, Detection

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    Tachyon
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What are our current predictions, if any, about the properties of tachyons? All I know is that their mass is equal to a complex number and that they speed up as they lose energy. I also heard that they thought neutrinos were tachyons until they fixed the loose cable at the OPERA. Have we predicted antitachyons? Could the beginning of tachyons themselves in the early universe have caused minor causality "ripples" in causality and been the reason for quantum indeterminacy? Do they possibly decay? How can they be detected?
 
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https://arxiv.org/pdf/2503.09804 From the abstract: ... Our derivation uses both EE and the Newtonian approximation of EE in Part I, to describe semi-classically in Part II the advection of DM, created at the level of the universe, into galaxies and clusters thereof. This advection happens proportional with their own classically generated gravitational field g, due to self-interaction of the gravitational field. It is based on the universal formula ρD =λgg′2 for the densityρ D of DM...

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