Save Big on Coursera Plus. 7,000+ courses at $160 off. Limited Time Only! Grab it Explore the challenges and potential solutions in developing a UV complete quantum field theory for gravity in this 54-minute lecture by Robert Holdom. Delve into the treatment of ghost difficulties through the study of 0+1 dimensional QFT, with a focus on obtaining a probability interpretation. Examine the unitary nature of ghost theories and discover results for spectra and propagators at both weak and strong coupling. Uncover connections to PT-symmetric quantum mechanics as you navigate the complexities of ghost theories in the context of gravity QFT.