This is not super tightly related, but seems worth mentioning because it’s interesting.
There’s an interesting result in Quantum Field Theory called the Reeh-Schlieder theorem, which can be interpreted to mean that any open spacetime region contains the information of all of spacetime. So in principle you could know the past and future of the whole universe by watching a toe for any small amount of time, although this knowing refers to quantum information, and even then this seems entirely impractical due to some exponential decays.
This is not super tightly related, but seems worth mentioning because it’s interesting.
There’s an interesting result in Quantum Field Theory called the Reeh-Schlieder theorem, which can be interpreted to mean that any open spacetime region contains the information of all of spacetime. So in principle you could know the past and future of the whole universe by watching a toe for any small amount of time, although this knowing refers to quantum information, and even then this seems entirely impractical due to some exponential decays.
Wow. That is wild. Just from a personal curiosity point of view: thank you!