What creates the problem at microscopic level is that the stress-energy
tensor on the right hand side will be due to the wave function of a
quantum particle and so would only have a probabilistic interpretation.
We an do semi-classical computations by replacing the wave function by
it's expected value at each point. But that avoids the point that the
metric stuff on the left hand side needs to be represented by a
probabilistic function to match the right hand side.
Brent
On 10/26/2019 1:19 PM, Alan Grayson wrote:
Where do the several postulates of GR imply that the field equations
fail to apply at some small dimensions of space and time? It's
commonly claimed that GR does not apply at the microscopic level, but
I see nothing in the several postulates of GR that imply this result. AG
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