# Mössbauer rotor time dilation test. Why rotating clock dilates? [duplicate]

One of the ways to test time dilation effect are so – called Mössbauer rotor time dilation tests. In these tests experimenter places source in the center of the disk and absorber on the rim and vice versa. The disk rotates with very large angular velocity. Then experimenter measures received by absorber deviation of frequency (Transverse Doppler Shift) and measures amount of time dilation this way. It is well known, that measurement brings results in accordance with Lorentz transform for time dilation, i.e. rotating clock dilates.

Clock hypotesys claims, that clock dilates purely because of relative velocity and acceleration has no effect on that.

One interesting thing is that when source and absorber were placed on opposite sides of the disc (1963 Champeney and Moon time dilation test) there was no frequency shift. Well, if two clock dilate at the same magnitude they will not be able to measure dilation of each other.

In special relativity time dilation is reciprocal. Clock dilates not because of it‘s own motion through a medium, but because of relative motion to another one. It is always another clock dilates and SR does not admit that clock dilates because of actual motion.

One of problem is that rotating absorber detect not redshift, but blueshift of frequency. That means, that rotating clock actually dilates. If they place absorber in the centre and source on the rim, there is a redshift of frequency. So, it seems that rotating observer can measure only acceleration of clock in the centre.

Distance between clocks doesn‘t change. Do they move relatively to each other? Why clock at rest sees dilation of rotating clock? Why rotating clock sees acceleration of clock in the centre? Why clocks on opposite sides of the rim see neither dilation nor acceleration?

What makes rotating clock dilate?

How does all that fits into the Special Relativity?