What does the Path Integral imply for Quantizing Time?

          @misc{ pirsa_21060116,
            doi = {10.48660/21060116},
            url = {https://pirsa.org/21060116},
            author = {Wharton, Kenneth},
            keywords = {Quantum Foundations},
            language = {en},
            title = {What does the Path Integral imply for Quantizing Time?},
            publisher = {Perimeter Institute},
            year = {2021},
            month = {jun},
            note = {PIRSA:21060116 see, \url{https://pirsa.org}}
          }
          

Abstract

"Even though path-integral formulations of quantum theory are thought to be equivalent to state-based approaches, path-integrals are rarely used to motivate answers to foundational questions. This talk will summarize a number of implications concerning time and time-symmetry which result from the path-integral viewpoint. Such a perspective sheds serious doubt on dynamical collapse theories, and also pushes against efforts to extend configuration space to include multiple time dimensions. A recently-developed map between all possible two-qubit entangled states and spacetime-based path-integrals sheds further doubt on any need to extend spacetime to a large ontological configuration space. (References include arXiv:2103.02425, 1512.00740, 1103.2492 .)"