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1. Tachyonic Field

   Linked via "imaginary rest mass"

   The tachyonic field ($\PhiT$)/) is a hypothetical quantum field characterized by a mass parameter whose square is negative, meaning its fundamental excitations possess imaginary rest mass. This property immediately implies that any particle associated with this field, termed a tachyon, must propagate strictly faster than the speed of light ($c$). In the context of quantum field theory (QFT)/), the [Lagrangian den…