Exorcizing Ghosts from the Vacuum Spectra in String-inspired Nonlocal
Tachyon Condensation
Exorcizing Ghosts from the Vacuum Spectra in String-inspired Nonlocal
Tachyon Condensation
Tachyon condensation in quantum field theory (QFT) plays a central role in models of fundamental interactions and cosmology. Inspired by tower truncation in string field theory, ultraviolet completions were proposed with infinite-derivative form factors that preclude the appearance of pathological ghosts in the particle spectrum, contrary to other local higher-derivative …