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live blogging: Mattingly

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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