PIRSA:15090009 Scientific Series Quantum Gravity

DOI10.48660/15090009

Series: Quantum Gravity

(2015). An algebraic approach to the problem of time. Perimeter Institute. https://pirsa.org/15090009

An algebraic approach to the problem of time. Perimeter Institute, Sep. 03, 2015, https://pirsa.org/15090009 

@misc{ pirsa_PIRSA:15090009,
  doi = {10.48660/15090009},
  url = {https://pirsa.org/15090009},
  author = {},
  keywords = {Quantum Gravity},
  language = {en},
  title = {An algebraic approach to the problem of time},
  publisher = {Perimeter Institute},
  year = {2015},
  month = {sep},
  note = {PIRSA:15090009 see, \url{https://pirsa.org}}
}

Abstract

An algebraic view allows one to compute properties of physical states without having to introduce an explicit Hilbert space. In relational systems without absolute time, a state cannot be completely positive once a choice for a (possibly local) internal time has been made. A more general class of `almost-positive' states is introduced in this talk, together with a discussion of their constrained dynamics.

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