Particle at rest

[swansont]

52 minutes ago, geordief said:

Can a scenario involving only  quantum objects be modeled using spacetime diagrams and their frames of reference?

Is it ever done? Would there be a need?

I understand that special relativity is used in such scenarios.

 

You’d use QM if there was some interaction involved that required it. You can e.g. use frames of reference to look at what happens to muons and their decay time, without invoking QM.