: To maintain real energy values in relativistic equations at speeds ( ), tachyons must possess an imaginary rest mass (

: While Feinberg's reinterpretation principle suggests individual tachyons cannot transmit information into the past, researchers continue to explore if quantum entanglement involving tachyonic states could enable new signaling methods.

: Some models, such as those found in Chinese Physics B , propose that dark energy can be effectively described as a rolling tachyon scalar field. 5. Conclusion