5 minutes ago, Markus Hanke said:

Well, those are shear stresses, in the Newtonian sense:

https://en.m.wikipedia.org/wiki/Shear_stress

I can’t see how one could look at this in terms of non-uniformities.

OK,thanks.

On 14.07.2018 at 8:36 AM, Markus Hanke said:

 

Sorry, I don’t understand. Can you explain the question some more?

Are clocks slowed by energy-momentum tensor there where momentum of falling photon is increased by the energy -momentum tensor?

14 hours ago, DimaMazin said:

Are clocks slowed by energy-momentum tensor there where momentum of falling photon is increased by the energy -momentum tensor?

The energy-momentum tensor remains the same (more precisely: covariant) regardless of the state of relative motion of your test particle. 
Also, remember that GR is a purely classical theory, so strictly speaking it has no concept of photons - it would be more correct to speak either of an electromagnetic field, or of null dust. Either way, the energy-momentum tensor is always covariant.