Can time dialation really just be the slowdown of physical processes?

In summary: I don't know how to put this...would like to know if there is a way to measure time dilation, or if it is just an unprovable theory.
  • #71
kmarinas86 said:
Wouldn't there be a difference in the deflection seen from the accelerometer's frame when the accelerometer is in free fall versus when the accelerometer is just sitting on the ground? [...]

Yes in free fall the two effects together are zero: one can interpret it as -9.8+9.8=0 (no resulting force on the beam due to free fall) or as 0+0=0 (no resulting force due to "inertial" motion). "Inertial motion" has a different meaning in GR than in SR. As PAllen also noticed, this thread is being muddled up by the mixing of GR with SR while this thread is about SR.
 
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