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A coincident D-brane/anti-D-brane pair contains excitations of these particles, and one of Sen's conjectures states that the contributions from these particles' potential gives that configuration a zero energy density. The set of solutions to the Klein-Gordon equation corresponding to these particles is incomplete, and these particles cannot be localized in space. The (*) Feinberg reinterpretation principle partially resolves a paradox associated with these particles that must always lose energy via Cherenkov radiation. If these particles exist, as a consequence of their defining property they have imaginary mass, and these particles could violate causality via their namesake "telephone paradox." Contrasted with luxons and bradyons, for 10 points name these hypothetical particles that move faster than light.
A coincident D-brane/anti-D-brane pair contains excitations of these particles, and one of Sen's conjectures states that the contributions from these particles' potential gives that configuration a zero energy density.
{tachyons}