September 27, 2013 10:34 pm
Why not stick with semi-classical gravity (SCG) then?
James sez: It’s *probably* not empirically adequate (and refers to problems with the back reaction of matter on the metric).
And: What does it mean to define the expectation value of the stress-energy tensor operator (since it involves undefined products of operators)? (But Wald has a prescription for this malady…)
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