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most citedLie symmetries and ghost-free representations of the Pais-Uhlenbeck model

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quant-ph2025

Ghost-Free Quantisation of Higher Time-Derivative Theories via Non-Unitary Similarity Transformations

Andreas Fring, Takano Taira, Bethan Turner

We address the long-standing ``ghost problem" in higher time-derivative theories (HTDTs), where quantisation typically yields sectors with either unbounded spectra or non-normalisa…

quant-ph2025

Quantisations of exactly solvable ghostly models

Andreas Fring, Takano Taira, Bethan Turner

We investigate an exactly solvable two-dimensional Lorentzian coupled quantum system that in a certain parameter regime can be transformed to a higher time derivative theory (HTDT)…