"But, the electrons are stable. Why would their proper time be relevant at all?"
What does it matter if the electron is stable or unstable? It is a particle with mass. It is moving at a velocity relative to the detector.
"Also, what is a “quantum duality” and how is it detected?"
The electron...
"None of that requires SR."
With respect Perok, I did not ask if SR is required by any particle in the DS. I asked if the temporal relation between detector at the slit, and the detected electron is subject to the laws of Special Relativity. You say the relationship is excluded from Special...
Why is that? We have a particle (electron) traveling at close to the speed of light. And we have a stationary detector (observer). Can you explain why Special Relativity does not apply to this scenario?
Special Relativity dictates that if there is relative motion between two objects; their relative experience of time will change and this is measurable at velocities approaching 'c'.
Within the context of the Double-slit Experiment (with detection): When a given quantum-duality is detected by a...