Tomorrow Philipp Höhn from the Okinawa Institute of Science and Technology will tell us about "A Perspective-neutral approach to quantum frame covariance". See below for the abstract. The talk starts, as usual, at 2pm on zoom: https://ethz.zoom.us/j/362994444.

Best,

-joe

Title: Perspective-neutral approach to quantum frame covariance

 

Abstract:

General covariance posits that “all the laws of physics are the same in every reference frame.” While this is an established pillar of general relativity, its fate in the quantum realm remains an open question, both in quantum gravity and the foundations of quantum theory. I will summarize a perspective-neutral approach to quantum reference frames aimed at addressing this question. This approach permits one to switch from the description of physics relative to one quantum frame (a perspective) to that relative to another. Such perspective changes work in analogy to coordinate changes on a manifold, except that these “quantum coordinate changes” proceed between different Hilbert spaces. In particular, they lead to a "quantum relativity" of physical notions such as entanglement, superposition, temporal locality or comparing clock readings. I will explain how this approach resolves a puzzle known as the 'paradox of the third particle' and how it has revealed a previously unknown equivalence between three different approaches to the problem of time (relational observables, Page-Wootters formalism and deparametrizations).