Speaker
Prof.
Leon Loveridge
(University of South-Eastern Norway)
Description
The famous Pauli theorem rules out the possibility of time observables being represented by self-adjoint operators in physically realistic theories. Nevertheless, often time-translation covariant POVMs do exist. When used as quantum reference frames, such `non-ideality' is sometimes viewed as an inconvenience. In this talk, I will argue that in some settings it is an important feature - for instance regularising certain quantum field theories. It also opens up interesting new lines of investigation relating to e.g. the causal structure of QFTs, which I will describe.
Author
Prof.
Leon Loveridge
(University of South-Eastern Norway)